PRESSURIZED AIR SYSTEM MAINTENANCE OPERATIONAL CHECK (cont)
Pilot Center Circuit Breaker Panel
Pilot Caution/Warning Panel
APU is operating. To prevent injury to personnel, avoid contact with
rotating components and high pressure air discharge. Secure any loose
clothing and personal articles. Failure to do so could result in death or
serious injury. If injury occurs, get medical aid immediately.
b. Set ENCU temperature switch (fig. 752) to
full WARM. On aft deck, check for pulsing
air discharge from PAS overboard vent
If a pulsing air discharge is present or a loud banging
sound (surge) is heard, immediately shut down APU
(TM 1-1520-238-CL) and replace SDC
c. Check that air flows from ECS vents.
If air does not flow from ECS vents, have assistant
check ENCU shutoff valve indicator on aft deck
(fig. 751). If valve indicates OPEN, replace SDC
(TM 1-1520-238-23). If valve indicates CLOSED,
refer to TM 1-1520-238-T-8 to troubleshoot ECS.