Hydraulic Subsystems
T-45A UJPT, E2-C2, ADV, & IUT Eng-13
d.
Wheel brakes: wheel brake/emergency
flap accumulator provides enough
braking for one normal landing
e.
Flaps: full extension
3.
If HYD 1 fails, services lost include
a.
NWS: use differential braking instead
b.
Anti-skid: must be selected OFF to
conserve wheel brake/emergency flap
accumulator pressure for wheel brakes
c.
Launch bar extension: will retract due
to mechanical (spring) pressure
d.
Arresting hook retraction
e.
Landing gear and MLG door retraction
f.
Slats: remain in position set when
HYD 1 lost
B.
Electrical system
1.
28 VDC essential services bus
a.
Arresting hook (up/down proximity
switches, hook warning lights)
NOTE: The arresting hook itself is
mechanically controlled and gravity-
operated with pneumatic assist. Even
if batteries or the essential services
bus itself fails, the hook will extend
(can be extended).
b.
Landing gear control (control and
lights)
(1) If power to essential services bus
fails, normal gear extension is not
possible
Page 13-48
(8-03) Original
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