T-45C TS, ADV & IUT ENG-11
Hydraulic Subsystems
powers the arresting HOOK warning light, the LDG
GEAR UP/DN handle, landing gear down and locked
advisory lights, NWS, anti-skid, brake pressure release
system 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.
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 FUEL caution light
remains on once illuminated, the AOA approach lights
flash when the HOOK BYPASS switch is set to
CARRIER (if the hook is not extended), and the
approach mode display of the HUD is enabled. If the
gear is up and locked, the landing gear handle position
lighting is disabled, and the cruise mode display of the
HUD is enabled.
(9-98) Change 4
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