4. Using the panel emergency lowering device,
place the fitted end against the panel linkage arm
and attach the ring end to a tractor tow pintle.
Push with the tractor until the operating gear
linkage unlocks.
Remove the panel emergency
lowering device.
5. Adjust the panel lowering speed by
opening/closing the emergency bypass valve.
6. After hydraulic failure is corrected, perform
the following:
a. Shut the vent valves to the top cylinder
chambers.
b. Remove the safety tag and open the
main fluid supply valve.
c. Raise the panels, opening and shutting
the vent valves as necessary to remove air from the
top cylinder chambers.
7. Return the equipment to the readiness
condition.
Inoperative Deckedge Control Panel or
Portable Electrical System Control Box
In the event of an emergency where the
deckedge control panel or portable electrical system
control box cannot be used, the auxiliary control
panel in the catapult retraction-engine machinery
room is made operational.
1. Station a crewperson at the deckedge or
flight deck to man a phone and relay instructions to
the auxiliary-control-panel operator.
WARNING
The crewman,
acting as a safety
observer, should ensure that the area around
the JBD is clear of aircraft, yellow gear, and
personnel.
2. With the transfer switch in the AUX
position, the auxiliary-control-panel operator shall
operate the panel by the instructions relayed to him
or her from the deck edge or flight deck.
CAUTION
Repair and checkout of the faulty panel
or
control
box operation shall be
accomplished at times when the raising or
lowering
of the JBD would not be
prohibited by aircraft movement on the
flight deck.
3. Continue operation of the auxiliary control
panel until the faulty deckedge control panel or
portable electrical system control box is completely
checked out and restored to proper operating
condition.
WARNING
Prior to returning control back to deck
operation, verify with the flight deck safety
observer that the area around the JBD is
clear of aircraft, yellow gear, and personnel.
4. Return control of the JBD to the deckedge
or portable control box operator.
MAINTENANCE
This section contains preventive and corrective
maintenance information and procedures, some of
which are general and apply to various items of the
system and others of which are specific and apply to
a particular part of the equipment.
Planned Maintenance
The planned maintenance system furnishes all
vessels and stations with MRCs containing specific
maintenance instructions. These cards are used at
required frequencies to maintain JBD equipment in
operating condition and to prevent breakdown and
subsequent shutdown of operations. The planned
maintenance system and the maintenance data
collection system are described in OPNAVINST
4790.4.
Current MRCs include the following inspection
and cleaning procedures:
1. Preoperational inspections
2. Postoperational inspections
3. Cleaning and inspecting hydraulic piping
orifice plate(s)
5-9
