TM 1-1520-238-T-5
7–90
7–21.
UTILITY HYDRAULIC SYSTEM – MAINTENANCE OPERATIONAL CHECK (cont)
7–21
Task
Result
aw. Remove tail wheel safety flag/pin
(TM 1-1520-238-23).
ax. On pilot TAIL WHEEL lock panel (fig. 7–44),
set UNLOCK/LOCK switch to UNLOCK
position.
ay. On pilot TAIL WHEEL lock panel (fig. 7–44),
check that the advisory light is lighted.
If advisory light does not light, go to
paragraph 7–39.
az. Check tail wheel lock actuator located above
tail wheel. Actuator retracts when tail wheel
lock switch is in UNLOCK position.
If tail wheel lock actuator does not unlock tail
wheel and TWHL LOCK circuit breaker is
closed, go to paragraph 7–40.
If TWHL LOCK circuit breaker is open, go to
paragraph 7–41.
ba. Insert tail wheel safety flag/pin
(TM 1-1520-238-23).
bb. Shutdown APU (TM 1-1520-238-23).
BATT/EXT PWR
SWITCH
M68-031
Figure 7–49.
Pilot ELEC PWR Panel
bc. On pilot instrument panel, set EMERG HYD
switch (fig. 7–45) to EMERG HYD position.
Check pilot emergency hydraulic pressure
indicator (fig. 7–43) for 3000 PSI steady
indication.
If pilot emergency hydraulic pressure indicator
does not indicate 3000 PSI and EMERG HYD
circuit breaker is closed, go to paragraph 7–42.
If EMERG HYD circuit breaker is open go to
paragraph 7–43.
