arm and attach the ring end to a tractor tow
hook. Push with the tractor until the operating
gear linkage unlocks.
Once the emergency lowering device is
installed, all hands shall stand back at a safe
distance from the JBD and around tractor. As
the JBD begins to lower, the emergency
lowering device will be dragged out of the JBD
pit by the tractor utilizing reverse gear.
opening/closing the emergency bypass valve.
Once the strut is over-center, the JBD panels
will fall under its own weight until it is flush
with the deck.
Inoperative Deckedge Control Panel or Portable
Electrical System Control Box
In the event of an emergency where the chestpack
or the deckedge control panel cannot be used, the
auxiliary control panel becomes operational.
Station a crewperson at the flight deck or
observer, should ensure that the area around the
JBD is clear of aircraft, support equipment, and
With the transfer switch in the AUX position,
operate the panel by the instructions relayed to
him or her from the flight deck or deck edge
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.
Continue operation of the auxiliary control
panel until the faulty chestpack or deckedge
control panel is completely checked out and
restored to proper operating condition.
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, support equipment, and personnel.
Return control of the JBD to the chestpack or
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 which are specific and apply to a
particular part of the equipment.
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
collection system are described in OPNAVINST
Current MRCs include the following inspection
and cleaning procedures:
Cleaning and inspecting hydraulic piping
procedures behind a JBD panel in the raised
position, install the panel supports to prevent
the panel from lowering. Failure to do this
could result in serious injury to personnel.
To ensure dependable operation of the JBD
equipment, proper lubrication of the mechanical
linkage is essential. Lubrication is part of the
preoperational checks given in the MRC. Extension
tubes are provided on trunnion bearings and hydraulic