Hydraulic Subsystems
T-45A UJPT, E2-C2, ADV, & IUT Eng-13
bar, drag brace, and holdback fitting, which
are integral to the NLG and are designed to
secure the aircraft to the catapult
mechanism and to transfer catapult energy
to the aircraft keel during catapult launch.
The launch bar is electrically controlled,
hydraulically extended, and mechanically
retracted through the use of spring-loaded
pressure. Three possible positions apply to
the launch bar: taxi (retracted), launch
(extended), and stowed (gear retracted).
Once the shuttle mechanism has engaged
the launch bar during catapult launches,
the LAUNCH BAR switch is set to
RETRACT. Immediately after takeoff,
spring pressure retracts the launch bar.
Cockpit controls and indicators used to
operate the launch bar include the
LAUNCH BAR switch and the L BAR lights.
D.
Arresting hook
Sg 2, fr 15
Hydraulic Actuator/Damper
Uplatch Mechanism
1.
Major components 1.4.13.3.1
a.
Hydraulic actuator/damper
Arresting Hook Assembly
Oleo-Pneumatic Centering Unit
ARRESTING HOOK SYSTEM MAJOR
COMPONENTS
(1) Hydraulically retracts arresting
hook (HYD 1 pressure, 3,000 psi)
(2) Pneumatic snubber preload (950
+/-50 psi) nitrogen pressure (with
gravity assist) extends arresting
hook and provides positive down-
force to prevent hook bounce and
possible hook slap
(3) Provides positive hydraulic retract
actuator pressure to relieve
mechanical load on uplatch
mechanism
Page 13-42
(8-03) Original
Previous Page
