4 ALBERT EMBANKMENT
LONDON SE1 7SR
Telephone: 020 7587 3152
Fax: 020 7587 3210
IMO
Ref. T4/4.01 MSC.1/Circ.1205
26 May 2006
GUIDELINES FOR DEVELOPING OPERATION AND MAINTENANCE
MANUALS FOR LIFEBOAT SYSTEMS
1 The Maritime Safety Committee, at its eighty-first session (10 to 19 May 2006), taking into
account the number of casualties with lifeboat systems, further recognizing the need to improve
manuals for operation and maintenance of lifeboat systems, and having considered proposals by the
Sub-Committee on Fire Protection at its fiftieth session, approved the Guidelines for developing
operation and maintenance manuals for lifeboat systems, as set out in the annex.
2 Member Governments are invited to bring the annexed Guidelines to the attention of all
parties concerned with their application, as appropriate.
***
MSC.1/Circ.1205
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ANNEX
GUIDELINES FOR DEVELOPING OPERATION AND MAINTENANCE
MANUALS FOR LIFEBOAT SYSTEMS
1 Scope and purpose of the guidelines
Seafarers often change ships and sometimes are not familiar with the lifeboats on their ships.
Casualties with lifeboat systems are often caused by poor understanding of the lifeboat systems,
especially release gear systems. User-friendliness of manuals for lifeboat systems is, therefore,
important to help prevent casualties.
The purpose of these guidelines is to encourage development of user-friendly manuals for operation
and maintenance of lifeboat systems including launching appliances. These manuals should be easy
to understand. The guidelines demonstrate the appropriate level of detail and use of illustrations in
explaining the safe use of critical systems. Manufacturers of lifeboats and launching/recovery
appliances are invited to make manuals easy to understand, taking into account these guidelines. The
use of video materials in conjunction with printed manuals can be an effective tool for mariners who
may not be inclined to read a manual.
These guidelines are not applicable to the emergency instructions required by
SOLAS regulation III/8, operating instructions such as posters and signs required by
SOLAS regulation III/9 or other brief instructions for operation of lifeboats.
These guidelines are for manuals to be carried on ships for use by seafarers, and accordingly the
section on weekly and monthly inspection and maintenance does not refer to detailed
maintenance/repair work. Detailed maintenance/repair work should be conducted by the
manufacturer’s representative or a person appropriately trained and certified by the manufacturer for
the work in accordance with MSC.1/Circ.1206.
2 Collaboration of manufacturers of the lifeboat and the launching appliance
A manual for a lifeboat system including launching appliance should be developed with the
collaboration of manufacturers of the lifeboat and the launching appliance and preferably be a single
document. As a minimum, the use of different words for the same gear/parts of the lifeboat system
should be eliminated by the collaboration of manufacturers of the lifeboat and the launching
appliance to prevent misunderstanding by seafarers. Hereafter, these guidelines assume a manual for
a lifeboat system includes the launching appliance as a minimum, but separate lifeboat, release gear,
and launching appliance manuals may be effective if adequately co-ordinated and using the same
style of presentation per these guidelines.
3 Contents of a manual for a lifeboat system
3.1 Items to be included
An operation and maintenance manual for a lifeboat system should include, as a minimum, the
following items:
.1 overview and specification of the lifeboat system;
.2 explanation of the structure and working principle of the major parts of the lifeboat
system including release gear systems;
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.3 operation of the lifeboat system; and
.4 routine inspection and maintenance of the lifeboat system.
3.2 Organization, description and layout of manual
3.2.1 Outline
It is recommended that a manual for a lifeboat system be developed with the following major
divisions:
1 General description of the whole lifeboat system.
2 Method of checking proper closure of release hooks.
3 Launching operation.
4 Recovery operation.
5 On-load/off-load release gear.
6 Inspection and maintenance.
3.2.2 Explanation of major components and their function
The structure and working principle of the lifeboat’s major components, in particular the on-load/offload
release gear, should be explained using figures and preferably three-dimensional perspectives.
In addition, the operation of the release gear should be described sequentially, using short phrases
written in the active voice.
3.2.3 Operation of lifeboat system including release gear systems
The operation of the lifeboat system should be described using the following elements:
.1 flow of the operation should be explained;
.2 detail of operation should be explained with figures. Operation and relevant
movement of the parts of the release gear should be described with
illustrations/photos, preferably using annotations and arrows to show direction of
movement; and
.3 hazards, precautions and notes should be identified with symbols specific to the level
of risk. As an example of the various levels of risk and the appropriate associated
symbols, the following are recommended:
.1 For the highest level of risk, such as in the explanation of “on-load release
operation”, the following symbol (red background) should be used with a
warning statement similar to the following:
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Warning
This operation releases the lifeboat and may result in the lifeboat
dropping and causing death or serious injury if released too soon.
Note: International standard symbols (ISO 3864-1 and ISO 7010) are recommended where
appropriate, but since marine use is excluded from the scope of these standards, and
they fail to indicate different levels of risk, the “graduated” symbols are
recommended.
.2 For the second highest level of risk, such as in the explanation of “davit arm
stop release operation”, the following symbol (yellow background) should be
used with a caution statement similar to the following:
Caution
Incorrect or incomplete resetting may cause the lifeboat to drop
resulting in death or serious injury.
.3 For less critical mandatory instructions the following symbol (blue
background) should be used with appropriate instruction:
Mandatory
Place the manual gripe out of the way to prevent tangling round the
lifeboat.
. . .
.4 Important notes may be emphasized with symbol and style of instructions
similar to the following:
Note
In case the hook is not released by the above operations, confirm
condition of each hook and whether the boat is waterborne or not.
Even though the hooks cannot be released by the above mentioned offload
release operation, the on-load release procedure, described in the
following pages, is possible.
.5 Prohibited actions should use the following symbol (coloured red) and style
of instruction:
Never
Never enter lifeboat without ensuring complete closure of release
hooks. Incomplete resetting of the release hooks can cause the lifeboat
to drop and may result in the death of occupants.
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3.2.4 Inspection and maintenance
The items for weekly and monthly inspection/maintenance and other inspection/maintenance should
each be explained separately.
4 Improvement of user-friendliness of a manual
4.1 Use of figures/photographs
Figures, preferably coloured, or photographs should be used as far as practicable to make manuals
easy to understand.
4.2 Use of standard wording
The following standard wording should be used to explain lifeboat systems where provided, and for
each of the applicable items illustrations should be provided to show the items and their location in
the lifeboat or on the ship. The use of alternative terms for variety should be avoided, except to
further define or clarify a term so that the reader never has to guess what item or system is being
discussed.
.1 Davit/winch:
.1 Auto releasing gripe
.2 Davit arm
.3 Davit arm stop
.4 Davit remote control wire handle
.5 Frame
.6 Maintenance (hanging off) pennant attachment points, if provided
.7 Manual gripe, if provided
.8 Remote control wire
.9 Winch manual brake safety pin
.10 Winch hand crank handle
.11 Winch centrifugal or lowering brake
.12 Winch hand brake or stop brake lever
.2 Freefall:
.1 Roller or sliding pad
.2 Sea lashing rope
.3 Emergency release device
.3 Release gear:
.1 Hook control cable
.2 Hook retainer (lock piece)
.3 Hydrostatic interlock
.4 Hydrostatic interlock lever, if provided
.5 Interlock (“mechanical protection” of on-load release)
.6 Maintenance (hanging off) pennant attachment points, if provided
.7 On-load release
.8 Release handle
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.9 Release handle “closed (locked)” and “open” positions
.10 Release handle “safety pin”
.11 Release hook (hook unit) (fore and aft hooks)
.12 Reset lever, if provided
.13 Safety latch (keeper)
.4 Suspension:
.1 Foul weather recovery strops
.2 Suspension block
.3 Suspension link (lifting ring)
.5 “Officer in charge” of lifeboat
5 Example of an operation and maintenance manual for a lifeboat system
An example of an operation and maintenance manual for a fire-protected lifeboat system is attached
in the following pages just for reference. It demonstrates the suitable level of detail that should be
expected for manuals. It should be noted that lifeboat systems are different from each other and
some specifications in the example manual are not applicable to lifeboat systems of other types. The
example attached at appendix is a model manual which is recommended as an example for
developing specific manuals for lifeboat systems launched by falls, but the same general principles
should be used for manuals for freefall lifeboat systems.
* * *
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APPENDIX
EXAMPLE OPERATION AND MAINTENANCE MANUAL FOR A LIFEBOAT
SYSTEM*
Table of contents
1 General
2 Method of checking proper closure of release hooks
3 Launching operation
3.1 Preparation before launching
3.2 Setting painter
3.3 Release of safety pin for winch hand brake lever
3.4 Release of davit arm stop
3.5 Boarding the lifeboat
3.6 Launching procedure
3.7 Release gear operation
3.8 Painter release and lifeboat operation
4 Recovery operation
4.1 Resetting procedure of release hook
4.2 Recovery procedure
4.3 Stowage procedure
5 On-load/off-load release gear system
5.1 General
5.2 Fore and aft hook units
5.3 Release handle unit
5.4 Hydrostatic interlock unit
6 Inspection and maintenance
6.1 General precautions
6.2 Inspection and maintenance of lifeboat and release gear system
6.3 Inspection and maintenance of launching appliances (davits and winches)
* Of a lifeboat being launched using falls and a winch, hereinafter referred to as a lifeboat.
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1 General
The lifeboats are stored on the boat davits on both sides of the ship. In case of emergency, the crew
can board the lifeboat and escaped with the lifeboat directly from its stowage position.
The launching appliance consists of a boat davit (davit arm, frame, platform, falls, suspension block,
and gripes/lashing device) and a boat winch (reduction gears, hand brake and centrifugal brake).
Swinging out and lowering of the lifeboat can be controlled both from the inside of the lifeboat and
at the ship’s deck. The lowering speed of the lifeboat can be controlled by operating the remote
control wire inside the lifeboat or by operating the remote control lever on the ship’s deck.
Moreover, it is possible to suspend the lowering operation of the lifeboat at any height.
Recovery of the lifeboat is performed by operating the boat winch with the push-button switch box.
When the davit arm reaches a prescribed position, the boat winch is automatically stopped by the
limit switch. After the activation of the limit switch, the boat winch is operated manually to wind up
the lifeboat to its stowage position. The boat winch is provided with a safety device to prevent the
reverse operation of the manual handle.
The lifeboat is equipped with on-load/off-load release gear which complies with the requirements of
the IMO Life-Saving Appliance (LSA) Code. The release gear system is equipped with a hydrostatic
interlock system so that it will normally not release the hooks until the boat is waterborne.
To avoid possible injury or death, read this manual carefully before using the boat davit, the boat
winch, and the on-load/off-load release gear.
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Suspension Link
Davit Arm
Stop Handle
Remote Control Wire
Platform
Auto Releasing
Gripes
Boat Winch Hand Brake Lever Deck Operation Device
Hand crank
Handle
Skate
Boat Fall
Wire
Davit Arm
Trigger Hook
Limit Switch
Frame
Suspension Block
Davit Horn
Fig. 1.1 Lifeboat davit arrangement
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Release Hook
Duct Rudder
Propulsion Engine
Fuel Oil Tank
Centre Bench
Hook Control Cable
Steering Wheel Interior Light Entrance Hatch Locker Head Rest Seat Belt
Compass Hatch
Release Handle
Steering Seat
Breather Valve
Emergency
Steering Lever
Propeller Stern Tube
Hydrostatic Interlock Unit
Drinking Water
Side Bench
Winch Remote Control
Wire
Spray Pump
Air Bottle
Drain Valve
F.O. Valve
Fig. 1.2 Fire-protected lifeboat
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2 Method of checking proper closure of release hooks
2.1 Safe use and operation of lifeboats during drills and inspection and maintenance is dependent
on knowing that the release gear is properly reset.
Never
Never enter lifeboat without ensuring complete closure of release
hooks. Incomplete resetting of the release hooks can cause the lifeboat
to drop resulting in death.
2.2 Purpose of on-load release. The IMO LSA Code requires, among other things, that the
lifeboat be fitted with “on-load release capability which will release the lifeboat with a load on the
hooks. The release mechanism shall be so designed that crew members in the lifeboat can clearly
observe when the release mechanism is properly and completely reset and ready for lifting. . . .”
On-load release is needed for launching when there is a current, when the ship is making way, or
potentially if there are waves which cause the hydrostatic interlock to only release intermittently.
On-load release also allows an empty or fully loaded boat to drop from any height, which can kill or
seriously injure the occupants. Therefore it is critical to know that the release gear is properly reset
and the release handle secured.
2.3 Ensuring release hook closure. The first thing to check whenever entering the lifeboat when
it is (or will be) supported by the falls is properly reset as follows:
No. Operation Guide Schematic Diagram
1
Check that the reset lever on each
hook is horizontal and in contact
with its stop.
<Activity in the lifeboat>
2
Check that the release handle is in
the closed (locked) position and
safety pin is installed.
<Activity in the lifeboat>
○
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3 Launching operation
3.1 Preparation before launching
No. Operation Guide Schematic Diagram
1
Prepare transceivers, and confirm the
communication condition.
<Activity on the ship>
2
<In case of drill>
Connect the push-button switch for
recovering to the receptacle.
<Activity on the ship>
3
<In case of drill>
Turn on the power switch of start
panel.
Detach the cable for the
storage battery charge.
<Activity on the ship>
4
Don life jackets.
<Activity on the ship>
Receptacle
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3.2 Setting of painter
No. Operation Guide Schematic Diagram
1
Confirm the connection of the painter
on the painter release device of the
lifeboat.
<Activity on the lifeboat>
2
Confirm the connection of the painter
as far forward as practicable inboard
of the falls but outboard of everything
else.
<Activity on the ship>
Caution
Ensure the painter is lead as far forward as practicable inboard of the
lifeboat falls but outboard of everything else. Failure to do so will
result in severe difficulties clearing the vessel during abandonment.
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3.3 Release of safety pin (if fitted) for winch hand brake lever
Caution
The safety pin of the winch hand brake should not be pulled out until
the completion of the preparation described in paragraphs 3.1
and 3.2.
No. Operation Guide Schematic Diagram
1
Pull out the safety pin (if fitted).
<Activity on the ship>
3.4 Release of davit arm stopper
Go up to the platform of the davit system (platform for boarding the lifeboat).
No. Operation Guide Schematic Diagram
1
Wind the boat fall manually to take off
the slack. Pull out the safety pin of the
davit arm stop, if fitted.
<Activity on the ship>
Note: Safety pins are generally
intended only for use during
maintenance or in port.
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No. Operation Guide Schematic Diagram
2
Release the davit arm stop by
operating the handle.
<Activity on the ship>
Caution
The handle should be fully operated to prevent the davit arm stop from
being caught with the lock device.
3.5 Boarding the lifeboat
No. Operation Guide Schematic Diagram
1
Confirm that the remote control wire
is drawn into the lifeboat.
<Activity on the ship>
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No. Operation Guide Schematic Diagram
2
Open the lifeboat boarding door and
board the lifeboat.
<Activity on the ship> and
<Activity in the lifeboat>
3
Ensure the bottom plug is fitted and
tight.
<Activity in the lifeboat>
4
Turn on the power supply switch.
<Activity in the lifeboat>
No.2 OFF No.1
5
Open the fuel oil valve.
<Activity in the lifeboat>
Engine F.O. Tank
6
Confirm that the cooling seawater
valve is open.
<Activity in the lifeboat>
Engine
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No. Operation Guide Schematic Diagram
7
Close the drain valve on exhaust pipe.
<Activity in the lifeboat>
8
Fasten seatbelt.
<Activity in the lifeboat>
Caution
Seating positions of persons should be carefully selected to maintain a
good trim of the lifeboat.
Warning
If the seat belt is not fastened, serious injury or death may occur.
3.6 Launching procedure
No. Operation Guide Schematic Diagram
1
Confirm that all crew boarded in the
lifeboat are seated and their seatbelts
are fastened.
<Activity in the lifeboat>
2
Start engine.
<Activity in the lifeboat>
START
GLOW OFF ON
Engine
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No. Operation Guide Schematic Diagram
3
Pull down the winch remote control
wire.
<Activity in the lifeboat>
Caution
• Ensure that no gripe or lashing is tangled around the fore and aft
hooks.
• Pull down the remote control wire gently and slowly during
swinging out of the lifeboat.
• Only pull down the remote control wire fully to lower the boat after
swing out is complete.
• The helmsman must tell the crew to standby for splashdown when
the lifeboat reaches the vicinity of the water surface.
Warning
• When using remote control gear from within the boat never wind
the cord or wire around fingers, hand or wrist as this may result in
the cutting off of fingers/hand.
• Do not stop the swinging out operation at deck position. Stopping
shakes the lifeboat and may cause casualties.
• A rapid swing out may cause dangerous impact on the boat when
the davit arm reaches the deck position.
• Inching operation shakes the lifeboat and is dangerous.
Note
During lifeboat drills, the above mentioned procedures may not be
applicable because the lowering operation may be controlled from the
ship’s deck using the deck operation device.
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3.7 Release gear operation
3.7.1 Releasing procedure
A flow chart of the off-load and on-load releasing procedures is shown in the following figure.
Releasing Procedure
Off-load release
(see paragraph 3.7.2)
On-load release
(see paragraph 3.7.3)
(1) Pull out the safety pin.
(2) Pull the release handle.
(2) Remove the hydrostatic
interlock cover.
(3) Lift up the hydrostatic
interlock lever and hold it.
(1) Pull out the safety pin.
(4) Pull the release handle.
Release operation completed.
WARNING!
Operate the release
handle only upon
confirmation of
safety by the officer
in charge! Release
of the lifeboat from
a height can cause
injury or death.
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3.7.2 Off-load release
This operation is the normal method of launch and
release and is conducted when the lifeboat is fully
waterborne.
Caution
Confirm the following before the operation:
• The lifeboat is fully waterborne.
• The engine is started.
• All crew are in their seats with their seatbelts fastened.
No. Operation Guide Schematic Diagram
1
Confirm that the lifeboat is
waterborne.
<Activity in the lifeboat>
2
Pull out the release handle safety pin.
<Activity in the lifeboat>
3
Pull the release handle to the fully
open position by one action.
<Activity in the lifeboat>
Note
In a case where the hook is not released by the above operations,
confirm condition of each hook and whether the boat is waterborne or
not. Even though the hooks cannot be released by the off-load release
operation described above, on-load release procedure, described in the
following pages, is possible.
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3.7.3 On-load release
This operation is conducted when the lifeboat is not
fully waterborne.
Warning
• Pay due precautions and conduct the on-load release operation in
accordance with orders of the officer in charge.
• Operation of the release handle upon insufficient confirmation of safety
may result in death or injury due to dropping the lifeboat in the water
from a height.
Caution
Confirm the following before the operation.
• The lifeboat is as close as possible to the water surface.
• The engine is started.
• All crew are in their seats with their seatbelts fastened.
No. Operation Guide Schematic Diagram
1
Confirm that the lifeboat is as close
as possible to the water surface, but
that the hydrostatic interlock is not
triggered.
<Activity in the lifeboat>
2
Pull out the release handle safety pin.
<Activity in the lifeboat>
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No. Operation Guide Schematic Diagram
3
Open the hydrostatic interlock cover.
Unlock the latch of the
interlock cover.
<Activity in the lifeboat>
4
Lift the hydrostatic interlock lever
fully and hold it.
<Activity in the lifeboat>
5
Pull the release handle to the fully
open position by one action.
<Activity in the lifeboat>
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3.8 Painter release and lifeboat operation
No. Operation Guide Schematic Diagram
1
Release the painter.
<Activity in the lifeboat>
2
Lifeboat operation
Ahead, astern, turning, spray, lighting
of interior light and canopy light, and
other performances.
<Activity in the lifeboat>
Caution
• Do not operate the steering gear to turn the lifeboat while the
painter is connected.
• The lifeboat should get clear of the ship promptly when the painter
has been released.
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4 Recovery operation
Outline of the resetting procedures is shown in the following figure.
Warning
• Incomplete resetting may result in death or serious injury due to
dropping of the lifeboat in the water from a height.
Hook Release Handle
One person each to
be stationed for the
fore and aft hook.
One person to
be arranged.
(1) Lift up the hooks.
(2) Swing down the reset
levers simultaneously.
(3) Confirm the hooks are
reset.
(4) Insert the safety pin.
(5) Fit the suspension links
in the hooks.
(6) Hoist the lifeboat just
clear of the water.
(7) Confirm the complete
reset.
Resetting Procedure
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4.1 Resetting procedure of release hook
The resetting procedure is to be in accordance with the following steps.
Note
At least three people are required for the resetting of the hooks.
No. Operation Guide Schematic Diagram
1
Lift the fore and aft hooks and hold
them closed.
A strong effort may be
required to lift the hook
and force the internal
lock piece to engage.
<Activity in the lifeboat>
2
Simultaneously swing down the reset
levers on both fore and aft hooks in
one continuous action to contact with
the stop.
The release handle
returns to its closed
(locked) position
automatically when the
reset levers are swung
down.
<Activity in the lifeboat>
○
3
Confirm the fore and aft hooks are in
the normal reset positions.
Make sure that the reset
lever is in contact with
the stop.
<Activity in the lifeboat>
○
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No. Operation Guide Schematic Diagram
4
Make sure that the release handle is in
the closed (locked) position and insert
the safety pin.
If the release handle is
not in its closed (locked)
position, it is not possible
to insert the safety pin.
<Activity in the lifeboat>
4.2 Recovery procedure
The recovery procedure is to be in accordance with the following steps only after completing the
release gear resetting.
Warning
• Great care must be exercised in reconnecting the hooks that hands and
fingers are kept clear.
• Failure to confirm proper resetting or to follow all steps below may
result in death or serious injury due to dropping the lifeboat in water
from a height.
4.2.1 Connection of the suspension link
No. Operation Guide Schematic Diagram
1
Manoeuvre the lifeboat to come under
boat falls.
2
Adjust the heights of the suspension
links by raising or lowering the boat
falls.
<Activity on the ship> and
<Activity in the lifeboat>
under good communication.
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No. Operation Guide Schematic Diagram
3
Insert the safety pin of the boat winch
handbrake.
<Activity on the ship>
4
Connect the suspension links of the
davit simultaneously to both, fore and
aft hooks.
<Activity in the lifeboat>
○
5
Hoist the lifeboat just clear of the water
and stop hoisting.
Confirm that the fore and
aft hooks are properly
connected.
<Activity on the ship> and <Activity
in the lifeboat>
6
Confirm that the hydrostatic interlock
lever has moved to the “locked”
position for the lifeboat not being
waterborne.
<Activity in the lifeboat>
7 Where the resetting is incomplete, return to the first step.
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Do not conduct recovery operation of the lifeboat unless the above procedures are fully completed.
Caution
�� Do not connect the suspension link of the davit to the hooks until
reset of the hooks has been fully completed. It is dangerous to
connect the suspension link during the resetting operation of the
hook and results an incomplete reset.
�� In case of using recovery strops, it is required to connect the bottom
link of the strops instead of the suspension link to the hooks.
Warning
�� Both hooks should be connected simultaneously to prevent damage
due to excessive load on one hook.
�� If only one hook is connected, the lifeboat may be suspended by the
single hook due to wave action resulting in injury or death.
4.2.2 Hoisting the lifeboat
No. Operation Guide Schematic Diagram
1
Hoist the lifeboat by operating the
winch using the push-button switch
following the instruction by the officer
in charge.
<Activity on the ship>
2
Hoist the lifeboat until the winch is
stopped by the limit switch.
<Activity on the ship>
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Caution
• The boat winch stops automatically when the davit arm strikes the
limit switch.
• Where the limit switch of boat winch does not work correctly, the
winch operator should manually stop the hoisting operation
immediately.
No. Operation Guide Schematic Diagram
3
Disembark from the lifeboat.
<Activity on the ship> and <Activity
in the lifeboat>
4.3 Stowage procedure
Note
Position two persons on davit platform to watch for proper stowage.
No. Operation Guide Schematic Diagram
1
Hoist the davit arm manually.
<Activity on the ship>
2
Confirm that the davit arm is in
contact with the stop on platform.
<Activity on the ship>
Caution
• Each person on the platform should signal to the winch operator
just when the davit arm reaches the stop on the frame.
• Confirm that the davit arm and the stops are in contact fore and aft.
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ANNEX
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Warning
• Stop the hoisting operation immediately when the signal from the
watchman is received.
• Over hoisting by manual operation may have serious consequences
due to damage of the boat fall and the davit.
No. Operation Guide Schematic Diagram
3
Detach the manual hoisting handle.
<Activity on the ship>
4
Set the davit arm stop immediately.
<Activity on the ship>
5
Insert the safety pin to the davit arm
stop handle.
<Activity on the ship>
Note: Safety pins are generally
intended only for use during
maintenance or in port.
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ANNEX
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No. Operation Guide Schematic Diagram
6
Lower the suspension block on the
davit horn by releasing the handbrake
of the winch.
<Activity on the ship>
Davit horn
Suspension
Block
Warning
• If the suspension blocks are not on the davit horn, the boat falls
remain in tension during sea going and the load may cause damage
to the boat falls.
No. Operation Guide Schematic Diagram
7
Install and tighten the auto release
gripe, if fitted.
Tighten the auto release gripe
rope with the turnbuckle.
<Activity on the ship>
8
Connect the painter to the painter
release hook on the bow of lifeboat.
<Activity on the ship>
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5 On-load/off-load release gear system
5.1 General
This section describes the details of the release gear system. Read this section carefully for safe
operation. This release gear system consists of fore and aft hooks, a release handle near the steering
console, a hydrostatic unit and the associated cables (see Fig. 5.1).
The releasing operation of the hooks is conducted at the release handle near the steering console
through the control cables terminating at the fore and aft hooks. The interlock system including the
hydrostatic interlock unit is provided to prevent the release of the hooks when the boat is not
waterborne.
The system also has an on-load release function which makes it possible to over-ride the interlock by
the hydrostatic unit. Incorrect on-load release operation may cause fatalities and due precautions
should be taken for this operation.
Fig. 5.1 Schematic of release gear system
Fore hook unit
Aft
hook
unit
Hydrostatic interlock unit
Control cables
Interlock cable
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5.2 Fore and aft hook units
5.2.1 Structure and parts names
The structure and parts names of the fore and aft hooks are shown in Figures 5.2.1.1 and 5.2.1.2.
The fore and aft hooks are generally identical except for the direction of installation.
Fig. 5.2.1.1 Perspective of the hook unit
Fig. 5.2.1.2 Internal view of the hook unit
Hook
Safety latch
Reset
lever
Maintenance
pendant
attachment
Cam
lever
box
Cam
lever pin
Hook
retainer
(Lock
piece)
Cam
lever
Control cables
(to release handle)
Reset lever
stop
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ANNEX
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5.2.2 Releasing
When the release handle near the steering console is pulled, the cam lever pin is turned by the
control cable and the lock piece is then made free. Finally the hook is turned and released
(see figure 5.2.2).
Fig. 5.2.2 Release principle of the hook unit
Hook
Hook retainer
(Lock piece)
Cam lever pin
Control cable
(to release handle)
Cam
lever
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5.2.3 Resetting
After the resetting of hooks, the posture of each hook is held by the lock piece and the lock piece is
locked by the cam lever pin with the reset lever. To ensure the proper resetting of the fore and aft
hooks, the procedures described in paragraph 4.1 should be followed. The fore and aft reset levers
must be operated simultaneously. After simultaneous resetting of the hooks, the release handle near
the steering console also returns to the closed position (see figure 5.2.3).
Fig. 5.2.3 Reset principle of the hook unit
Hook unit
Hook
Re-set
lever
Hook retainer (Lock piece)
Control cable
(to release handle unit)
Release handle unit
Cam
lever
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5.3 Release handle unit
5.3.1 Structure and parts names
The structure and parts names of the release handle are shown in figures 5.3.1.1 and 5.3.1.2.
Fig.5.3.1.1 Perspective of the release handle unit
Fig.5.3.1.2 Internal view of the release
handle unit
5.3.2 Operation
When the lifeboat is fully waterborne, the lifeboat can be released by removing the safety pin and
then pulling the release handle fully and quickly to the open position (off-load release). The lifeboat
can also be released by the same operation of the release handle even though the lifeboat is not fully
waterborne, by opening the interlock cover and lifting up the interlock lever. This over-rides the
interlock function of the hydrostatic interlock unit (on-load release).
Fig. 5.3.2 Operation procedure of the release handle
Safety pin
Release
handle
Control cables
(to the hook units
of fore and aft)
Interlock cable
(hydrostatic)
Interlock
cover
Release handle
(Closed position) (Open position)
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5.4 Hydrostatic interlock unit
5.4.1 Structure and parts name
Structure and parts names of the hydrostatic interlock unit are shown in figures 5.4.1.1 and 5.4.1.2.
Fig. 5.4.1.1 Perspective of
the hydrostatic interlock unit
Fig. 5.4.1.2 Internal view of
the hydrostatic interlock unit
5.4.2 Operation
When the lifeboat is fully waterborne, the hydrostatic interlock unit pushes up the interlock lever
through the interlock cable by the water lifting the float and thus allowing the release handle to be
operated. Contrary to this, operation of the release handle is not allowed by the hydrostatic interlock
unit when the lifeboat is not fully waterborne.
Interlock cable ( to the hydrostatic
interlock lever of the
release handle unit) Air vent
Rod
Hydrostatic
unit body
Flange
Water tight seal
Float
Pressure of
seawater
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6 Inspection and maintenance
6.1 General precautions
SOLAS regulation III/20 requires that all life-saving appliances shall be in working order and ready
for immediate use before the ship leaves port and at all times during the voyage. Lifeboats,
launching appliances and release gear are required by SOLAS regulation III/20 to be inspected
weekly and monthly according to the instructions for on-board maintenance complying with the
requirements of SOLAS regulation III/36. Also, MSC.1/Circ.1206 describes more detailed
procedures for periodic servicing and maintenance of lifeboats, launching appliances and
release gear.
This manual includes only the weekly and monthly inspection and maintenance, which are
conducted on board under the direct supervision of a senior ship’s officer.
6.2 Inspection and maintenance of lifeboat and release gear system
6.2.1 Inspection and maintenance plan
Lifeboats should be inspected and maintained weekly and monthly in accordance with the following
tables. The tables list the items to checked, the method of inspection, the procedures to be followed,
and the frequency at which the items are to be attended to.
Table 6.2.1.1 covers the basic lifeboat (including release gear).
Table 6.2.1.2 covers the lifeboat engine.
Table 6.2.1.3 covers the electric parts.
Table 6.2.1.4 covers the lifeboat equipment.
MSC.1/Circ.1205
ANNEX
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Table 6.2.1.1 - Inspection procedure and maintenance plan for boat
Items Method Inspection procedure Maintenance plan Weekly Monthly
Outside hull Visual
Inspect for deformation or other
defects.
Inspect for peeling or any damage
of retro-reflective material.
X X
Outside canopy Visual Inspect for deformation or other
defects. X X
Buoyant lifeline Visual Inspect for any damage. X X
Foldable canopy*1 Visual Inspect for any damage to canopy. X X
GRP Visual Inspect for deformation or other
defects. X X
Inside boat Wood Visual Inspect for crack or rot. X X
Metal Visual Inspect for corrosion. X X
Drain valve Visual Inspect for any damage. X X
Release gear Visual Check resetting condition.
Remove any dirt on moving parts. X X
Painter release device Visual Check resetting condition.
Remove any dirt on moving parts. X X
All hatches Visual
Operation
Inspect for easy operation and good
condition of gasket. X X
Window Visual Inspect for any crack on glass.
Clean both sides of glass. X
Visual Inspect for any damage of rudder,
tiller and emergency tiller. X X
Steering gear
Operation
Inspect for good operation of main
steering and connecting emergency
tiller.
X X
Stern tube Visual Inspect gasket and check for
leakage of seawater.
*2 *2
Propeller and guard Visual Inspect for any damage. X X
Breather valve Operation Inspect operation of valve. X
Visual
Inspect for proper tension of Vbelt.
Inspect for any damage of belt.
Clutch X
V-belt
Operation Inspect for proper operation. X
Spray pipe Visual Inspect for corrosion or any
damage. X
Water spray
system
Spray nozzle Visual Remove any deposit. X
High pressure
pipe Visual Inspect for any damage. X
Air support Regulator Visual Inspect for any damage. X
system
Air cylinder Visual Inspect for corrosion or any
damage. X
Note: 1 Applicable only to partially enclosed lifeboats.
2 When waterborne.
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Table 6.2.1.2 - Inspection procedure and maintenance plan for engine
Maintenance plan
Items Method Inspection procedure
Weekly Monthly
Visual Check in good condition. X
Engine Operation
Start and operate the engine.
Check operation of throttle.
Check operation of clutch.
X X
Visual Check an amount of oil. X
Lubricating oil Visual Check viscosity of oil with finger
and ensure it’s not dirty. X
Fuel oil tank Visual
Check securing condition of the
tank (corrosion or leakage and
connecting parts).
Check an amount of fuel oil.
X
Fuel oil pipe Visual Check any leakage on connecting
parts. X
Water cooler Visual Check an amount of fresh water. X
Cooling water pipe Visual Check any leakage on pipe. X
Starter switch Operation Check operating properly. X X
Glow lamp Operation Check light on when pre-heating. X X
Tachometer Operation Check proper indication of
revolution. X X
Oil pressure warning lamp,
Charge lamp Operation Check proper light on or light off
condition. X X
Stop wire Operation Stop the engine. X X
Table 6.2.1.3 - Inspection procedure and maintenance plan for electric parts
Maintenance plan
Items Method Inspection procedure
Weekly Monthly
Visual Check lead wire. X
Battery Measure Measure voltage of battery.
When voltage is low, charge battery. X
Inside lamp Operation Check light on. X
Canopy lamp Operation Check light on. X
Search light Operation Check light on. X
Electric wiring Visual Check any defects on wiring. X
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Table 6.2.1.4 - Inspection procedure and maintenance plan for lifeboat equipment
Check for condition, quantity and expiry date where applicable
No. Items Maintenance plan Weekly Monthly
1 Oars X
2 Thole pins or crutches X
3 Boat hooks X
4 Buoyant bailer X
5 Buckets X
6 Survival manual X X
7 Compass X
8 Sea-anchor X
9 Painters X
10 Hatchets X
11 Watertight receptacle and fresh water X
12 Dipper with lanyard X
13 Graduated drinking vessel X
14 Food ration in watertight container X
15 Rocket parachute flare X
16 Hand flare X
17 Buoyant smoke signal X
18 Waterproof electric torch X
19 One daylight signalling mirror X
20 One copy of life-saving signals X X
21 One whistle X
22 A first-aid kit X
23 Anti-seasickness medicine X
24 One seasickness bag for each person X
25 A jack knife X
26 Three tin openers X
27 Two buoyant rescue quoits X
28 A manual pump X X
29 One set of fishing tackle X
30 Portable fire-extinguishing equipment X
31 A radar reflector X
32 Thermal protective aids X
33 Compartments for storage X
34 A means for collecting rainwater X
35 A boarding ladder X
36 Seat belts X
37 Instructions of immediate action X X
38 Water resistant instructions X X
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6.2.2 On board maintenance procedures
6.2.2.1 General
As a result of inspection, any defective parts should be repaired in accordance with following
procedures. Any shortage of quantity should be supplemented to the correct number. Defective
parts other than the following should be recorded along with their details and ordered for
maintenance and repair by the manufacturers.
6.2.2.2 Boat
6.2.2.2.1 Rust on metal parts
Give anti-rusting treatment according to degree of damage, or replace if significantly wasted.
6.2.2.2.2 Damage of fabric
Repair fabric products by same material according to degree of damage.
6.2.2.2.3 Gasket
Repair with adhesive sealant according to degree of damage.
6.2.2.2.4 Drain valve
Remove any dirt and check correct operation.
6.2.2.2.5 Water spray system
Remove any deposit from spray nozzles. Tighten up pipe connecting parts when any leakage was
noted. Adjust to proper tension on V-belt.
6.2.2.3 Engine
6.2.2.3.1 Oil coating and filling
When any rust exists, remove rust and coat with machine oil. Rotating parts should be filled with
lubricating oil.
6.2.2.3.2 Operating test
An operational test of the engine should be carried out on board the ship and in the afloat condition
after launching at an appropriate opportunity to check the running condition. After the operational
test, ensure that the valves for the cooling water line are opened and flushed with fresh water and
drained completely.
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6.2.2.4 Electric parts
6.2.2.4.1 Battery
Fill up battery with electrolyte if level is below the designated position. Tighten up electric terminal
if it is loose.
6.3 Inspection and maintenance of launching appliances (davits and winches)
6.3.1 Inspection and maintenance plan
Launching appliances should be inspected and maintained weekly and monthly in accordance with
the following tables. The tables list the items to checked, the method of inspection, the procedure to
be followed, and the frequency at which the items are to be attended to.
Table 6.3.1.1 covers the davit.
Table 6.3.1.2 covers the winch.
Table 6.3.1.3 covers the electric parts.
Table 6.3.1.1 - Inspection procedure and maintenance plan for davit
Maintenance plan
Items Method Inspection procedure
Weekly Monthly
Frame Visual Check corrosion, deformation and
depression. X X
Visual Check corrosion, deformation and
depression. X X
Davit arms Operation Moving out from stowed position. X
Operation Turning out from stowed position. X
Visual Check wear and corrosion. X
Sheave, suspension block Operation Check moving condition. X X
Lubricate Lubricate/grease. X
Hinge pin, sheave pin Lubricate Lubricate/grease. X
Visual Check wear and corrosion. X X
Operation Check moving condition. X X
Davit arm stopper and trigger
hook
Lubricate Lubricate/grease. X
Visual Check wear, breakage of wire and
corrosion. X
Lubricate Lubricate/grease. X
Turn ends Turn ends of boat fall (2.5 years).
Boat fall,
Turn buckle
Replacing Replacing boat fall (5 years).
Lashing wire rope Visual Check wear, corrosion and
looseness. X X
Deck operation device Operation Check moving condition. X
Lubricate Lubricate/grease. X
Visual Check wear and corrosion. X X
Remote control wire Operation Check moving condition. X
Lubricate Lubricate/grease. X
Boat chock Visual Check wear and corrosion. X X
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Table 6.3.1.2 - Inspection procedure and maintenance plan for winch
Maintenance plan
Items Method Inspection procedure
Weekly Monthly
Visual Check level and deterioration of
Gear box, gear, bearing, oil lubricating oil. X
seal Operation Check unusual noise. X
Brake system,
Centrifugal brake Visual Check corrosion or any defects. X X
Wire end cotter Visual Check looseness. X
Brake lever Visual Check corrosion or any defects. X X Operation Check operating condition. X X
Speed change lever Lubricate Lubricate/grease. X X
Table 6.3.1.3 - Inspection procedure and maintenance plan for electric parts
Maintenance plan
Items Method Inspection procedure
Weekly Monthly
Electric motor Visual Check wiring. X X Operation Check normal operation. X
Visual Check wiring. X X
Limit switch Operation Check normal operation. X
Lubricate Lubricate/grease. X
Push-button switch box and Visual Check wiring and other defects. X X
cable Operation Check normal operation. X
Start panel Visual Check wiring and other defects. X X Operation Check normal operation. X
6.3.2 On-board maintenance procedure
6.3.2.1 General
As a result of inspection, any defective parts should be repaired in accordance with following
procedures. Any shortage of quantity should be supplemented to correct number. Defective parts
other than the followings should be recorded along with their details and ordered for maintenance
and repair by the manufacturers.
6.3.2.2 Wire rope
6.3.2.2.1 Wire ropes should be changed in the following cases:
.1 break of elemental wire was observed;
.2 7% reduction of nominal diameter was observed;
.3 kink or looseness of ply was observed; or
.4 erosion/corrosion was observed.
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6.3.2.2.2 Check fixing condition of wire ropes.
6.3.2.2.3 Change the boat falls within an appropriate period.
6.3.2.2.4 Adjust the length of boat falls as necessary so that the clearances between the davit arm
and davit arm stopper at fore and aft are almost the same.
6.3.2.2.5 Ensure that material and diameter of suspension links are as specified by the release gear
manufacturer.
6.3.2.3 Boat winch
6.3.2.3.1 Prior to commencement of the maintenance work for the winch, the boat should be secured
to prevent movement.
6.3.2.3.2 Oil should be checked and changed if discoloured. In case that oil level is low, oil should
be added until the its surface comes to the designated level in the oil gauge.
6.3.2.3.3 Surfaces of each gear inside the gear box should be checked. In case that a defect is found
on a surface of gear, the gear box should be replaced or repaired.
6.3.2.3.4 In case that the angle of brake lever has dropped due to abrasion of the brake lining, the
angle of the brake lever should be adjusted by loosening the bolts, adjusting the angle and tightening
the bolts again.
6.3.2.4 Greasing
6.3.2.4.1 Lubrication is essential for the function of the davit and winch and regular checking is
necessary. Greasing also should be regularly conducted. For appropriate greasing, the detailed
structure of the davit and winch and the functions of their parts should be understood.
6.3.2.4.2 All grease nipples of the davit should be greased at least once a month.
6.3.2.4.3 Gear oil inside the boat winch should regularly be checked regarding amount, change of
colour and mixture of moisture.
6.3.2.4.4 Wire rope oil/grease should be regularly checked to prevent loss of oil/grease. Wire rope
should be oiled or greased every two months in general.
______________
Toggle pin
Brake lever
Horizontal
Hex. bolt
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