Hydraulic Subsystems
T-45A UJPT, E2-C2, ADV, & IUT Eng-13
(5) After gear is up and locked, nose
gear doors close and lock
NOTE: The total time for NLG/
MLG retraction is about 10
seconds.
e.
Emergency extension system
Sg 1, fr 13
NOTE: 28 VDC essential bus powers
hydraulic control valves during normal
W
H
E
operations.
E
L
LDG
GEAR
S
DOO
R
NOSE
LEFT
RIGH
T
(1) Mechanically controlled and gravity
UP
TONE
operated
DN
LANDING GEAR CONTROLS AND
(2) Used whenever a HYD 1 or total
INDICATORS
electrical failure occurs
(3) Operates both NLG and MLG
(4) Initiated by rotating the EMER
GEAR handle clockwise and then
pulling, which:
(a) Neutralizes fluid pressure in
retract and extend hydraulic
lines
(b) Mechanically releases gear
uplocks and door locks
(c) Allows landing gear to extend
by gravity free-fall
(5) Mechanical downlocks engage
when fully extended (spring-loaded
overcenter lock links on main gear,
locking ring on nose gear drag link)
(6) MLG inner doors do not close
during emergency gear extension
Page 13-14
(8-03) Original
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