TM 1-1510-224-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
ENGINE RUNUP (CONT)
(d)
ENVIRO & PNEU BLEED AIR valve
switches (2) - ENVIRO & PNEU off.
(e)
PNEUMATIC
PRESSURE
gage/
GYRO SUCTION gage - Check.
Pressure should drop to zero.
(f)
BL AIR OFF annunciators (2) -
Check illuminated.
(g)
BL AIR FAIL annunciators (2) -
Check illuminated.
(h)
CABIN PRESS switch - TEST
(hold).
(i)
LEFT PNEU & ENVIRO BLEED AIR
valve switch - ON.
(j)
L BL AIR OFF annunciator - Check
extinguished.
(k)
BL AIR FAIL annunciators (2) -
Check extinguished.
(l)
PNEUMATIC
PRESSURE
gage/
GYRO SUCTION gage - Check in
green arc.
(m) CABIN CLIMB indicator - Check for
descent indication within 10 to 15
seconds, then release test switch.
(n)
LEFT PNEU & ENVIRO BLEED AIR
valve switch - Off.
(o)
Repeat steps e through m using the
right bleed air valve.
(p)
CABIN PRESS switch - Set to
pressure position (center).
(q)
CABIN ALT controller - Reset as
required.
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