Hydraulic Subsystems
T-45A UJPT, E2-C2, ADV, & IUT Eng-13
functions are no longer usable: NWS, anti-skid,
launch bar extension, arresting hook retraction,
landing gear/MLG gear door retraction and slats
operation.
The hydraulic subsystems receive electrical
power from the 28 VDC essential services bus,
and the 28 VDC generator bus. The 28 VDC
essential services bus powers the arresting
HOOK warning light, the LDG GEAR UP/DN
handle, landing gear down and locked lights,
warning light, NWS, anti-skid, and the WOW
system. Emergency extension of the landing
gear is required if the 28 VDC essential services
bus fails.
The following hydraulic subsystems provide
inputs to the CWS: slats, anti-skid, NWS,
launch bar, and parking brake. Unlike the slats,
anti-skid, launch bar, and NWS inputs, the
parking brake input is simply an indication that
the parking brake handle is extended when the
throttle position has been advanced beyond
approximately 70% rpm N2 position.
The WOW sensors signal various aircraft
systems as to whether the aircraft is airborne or
on the deck. These sensors report this status to
the airborne data recorder. Depending on the
condition reported, several hydraulic subsystem
functions are either enabled or disabled. If a
weight-off-wheels condition exists, the NWS
system is disabled, extension of the launch bar
is prevented, and the anti-skid touchdown
protection mode is enabled. If a weight-on-
wheels condition exists, the NWS system is
enabled and launch bar extension is enabled.
The position of the landing gear is monitored by
the airborne data recorder and affects aircraft
operations as follows. If the gear is down and
locked, gear down position lighting is activated,
the WCP FUEL LOW caution light remains on
(8-03) Original
Page 13-52
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