TM 1-1520-238-T-5
Change 4
7–136.1/(7–136.2 blank)
7–45.
PRESSURIZED AIR SYSTEM – MAINTENANCE OPERATIONAL CHECK (cont)
7–45
q. With engine 1 operating, open FUEL BST
circuit breaker on pilot center circuit breaker
panel (fig. 7–53). Check for noticeable
reduction of ECS airflow.
If ECS airflow is not reduced, go to paragraph 7–50.
If PAS manifold loses pressure, replace bleed air
shutoff valve (TM 1-1520-238-23).
r. With FUEL BST circuit breaker open and
engine 1 supplying bleed air for PAS,
transfer fuel back to original levels as in step
h above. Check that FUEL quantity
indicator shows transfer.
If FUEL quantity indicator does not show transfer, go
to paragraph 7–51.
s. On pilot center circuit breaker panel, close
FUEL BST circuit breaker. On pilot
caution/warning panel, check that SHAFT
DRIVEN COMP indicator is not lighted.
If SHAFT DRIVEN COMP indicator is lighted, go to
paragraph 7–49.
t. Shut down engine 1 (TM 1-1520-238-CL).
u. Open access doors L325, R200, T250L,
T290L, and T290R (TM 1-1520-238-23).
v. On aft deck, perform visual inspection of
PAS components (TM 1-1520-238-23).
If PAS components are leaking, or appear damaged,
replace (TM 1-1520-238-23).
7. Shut down APU TM 1-1520-238-CL).
8. Secure access doors L325, R200, T250L, T290L, and T290R (TM 1-1520-238-23).
9. Disconnect maintenance headset (TM 1-1520-238-T-4).
END OF TASK
