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2. Engine chop circuit | Up
TM-1-1520-238-MTF Maintenance Test Flight Manual Helicopter Attack
AH-64A Apache | Next
ENGINE RUNUP – PILOT (CONT) |
TM 1-1520-238-MTF
Change 1
2-60
PROCEDURE
TROUBLESHOOTING
REFERENCE
ENGINE RUNUP – PILOT (CONT)
NOTE
Engine chop circuit check should be per-
formed at phased maintenance checks as
required.
a. Slide collar on collective forward,
rotate clockwise, and release.
b. Np and NG – Check at idle.
c. ENGINE CHOP warning light –
Check illuminated.
d. MASTER CAUTION panel – Reset.
e. PWR levers – IDLE.
f. Slide collar on collective forward,
rotate counterclockwise, and
release. ENGINE CHOP warning
light should extinguish.
g. PWR levers – FLY.
h. Np and Nr – 100%.
i. Repeat steps a. thru h. using CPG
controls.
*3. Engine overspeed test – Check as
follows:
NOTE
Failure for the engine to automatically
relight and flameout when both OVSP TEST
A and B are pressed simultaneously is ac-
ceptable.
A4
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