TM 55-1510-220-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
time should be 2.5 to 4.0 seconds.
*6. Engine high idle speed - Check 70 to 73% N1.
E1
*7. Brake deice system - Check as follows:
a.
Power - Set 70% N1.
b.
Left bleed air valve switch - PNEU & ENVIRO OFF.
c.
Right bleed air valve switch - OPEN.
d.
Brake deice switch - Turn on and observe that the BRAKE DEICE ON light is illuminated.
e.
Pneumatic pressure gauge - Check for a momentary pressure decrease.
f.
Repeat procedure for opposite bleed air valve.
*8. N1 speed switch (air conditioning) - Check as follows:
a.
Right engine condition lever - LOW IDLE.
b.
Cabin temperature mode selector switch - MANUAL COOL.
c.
Right engine condition lever - Advance to increase N1 to 57 to 63%. AIR COND NI LOW light should
extinguish.
d.
Air conditioning compressor should turn on 8 to 12 seconds after light extinguishes, as indicated by
sustained increase in TGT on right engine.
2-27
