valve is in this position. This position should be
used to stop stanchions during raising or lowering or
to hold the stanchions either up or down.
The control valve lever must never be
held or left in any position between 1 and 2
or 2 and 3, since this allows fluid to drain
from the accumulator, through the system,
to the gravity tank.
The power package accumulator does not
contain sufficient fluid to raise and lower the
stanchions more than three times without the pump
operating. Approximately 20 minutes is required for
the pump to replenish fluid to the operating level in
the accumulator, if stanchions are cycled three times
without the pump operating.
CONDITION for normal operation specifies 1,500
psi accumulator pressure; however, stanchions will
raise and lower, taking a longer period of time with
a lower pressure, as is experienced if stanchions are
cycled without the pump operating. Pressure at the
start of the third cycle will be approximately 850 psi
without the pump operating.
If the stanchions are cycled more than
three times without the pump operating, air
will enter the piping and cylinders, and fluid
will overflow the gravity tank. It is then
necessary to fill, vent, and charge the system
as specified in the applicable operating
During the READY and SECURE conditions,
the following checks are to be made:
During the READY condition at 1-hour
check the accumulator pressure,
accumulator and gravity tank liquid levels, controller
switch for AUTOMATIC setting, and make sure the
pump is not operating when accumulator pressure is
1,500 psi or above.
During the SECURE condition, make a daily
check of the accumulator pressure, accumulator and
gravity tank liquid level, valves for position (open or
closed), and controller switch for OFF setting.
The system must be operated WEEKLY to raise
and lower the stanchions, to vent air from both ends
of the hydraulic cylinders, and to check the
operations of the system. It is not necessary to
attach the barricade webbing during this exercise.
Arresting gear must be kept ready for instant
use. There is only one way such a condition may be
effected; that is, by constant inspection, repair, and
maintenance. Preoperational and postoperational
inspection of all components is a necessity and
mandatory, as directed by the applicable MRC.
Every section, topside, below deck, engine areas,
and ready stowage must be prepared to function on
Maintenance can be divided into two broad
categories: preventive maintenance and corrective
maintenance. Preventive maintenance consists of
routine shipboard procedures designed to increase
the effective life of equipment or to forewarn of
includes procedures designed to analyze and correct
material defects and troubles. The main objective
of shipboard preventive
maintenance is the
of breakdown, deterioration, and
malfunction of equipment.
If, however, this
objective is not reached, the alternative objective of
repairing or replacing failed equipment-corrective
maintenancemust be accomplished.
Maintenance by the arresting gear crew must go
beyond a wipedown and periodic lubrication. The
arresting gear personnel must be instructed to alert
the officer in charge to any signs of malfunction,
wear, looseness, leakage, damage, or any other
irregular conditions in the arresting gear equipment.
They should also learn the physical location of all
operating parts, cable runs, air supply lines, valves,
electrical supply lines, switches, fuse boxes, tools,
and spare parts.
Engine inspection should be visual, mechanical,
and operational. The following general notes apply
to maintenance throughout the arresting gear
Mechanical inspection is performed while
the engine is at rest. It consists of a security check,
exercising the engine, and manipulating the controls.
This inspection is a check for looseness, excessive
play, improper operation of hidden parts, lack of
lubrication, or any abnormal resistance to motion.