TM 55-1510-221-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
ENGINE RUNUP (CONT)
(may take up to 60 seconds)
d
Right engine condition lever Advance to
increase N1 to above 63%. AIR COND
N1 LOW light should extinguish
e
Air conditioning compressor should turn
on 8 to 12 seconds after light
extinguishes, as indicated by sustained
increase in TGT.
*9.
Pneumatic pressure Check as follows
a.
Condition levers HIGH IDLE.
b.
Power Ievers IDLE.
c.
Left bleed air valve switch PNEU &
ENVIRO OFF.
d.
Pneumatic pressure Check 12 to 20
PSI.
c.
Left bleed air off light Check illuminated
f.
Right bleed air valve switch PNEU &
ENVIRO OFF
g.
Left and right bleed air off lights Check
illuminated
h.
Left and right bleed air fall lights Check
Illuminated
i.
Left bleed air valve switch - OPEN
Check L BL AIR OFF and L&R BL AIR
FAIL lights off, and pneumatic pressure
at 12 to 20 PSI
2-30
