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3. Engine overspeed test | 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
2-61
PROCEDURE
TROUBLESHOOTING
REFERENCE
ENGINE RUNUP – PILOT (CONT)
CAUTION
If Np drops below 86% and/or TGT rises
above 852 °C, immediately retard test en-
gine PWR lever to OFF. Place ENG
START switch to IGN OVRD until TGT is
below 540 °C.
a. ENG 1
CAUTION
If engine OVSP TST switches are not re-
leased immediately, engine overtemp
may occur.
(1) CKT A switch – ENG 1. NG
should remain stable. Release
switch.
(2) CKT B switch – ENG 1.
EMERG PWR advisory light
illuminates, NG remains stable.
Release switch.
(3) CKT A and CKT B switches –
ENG 1. NG should decrease.
EMERG PWR advisory light
illuminates. Release switches.
b. ENG 2 – Repeat procedure in
step a. above for ENG 2.
*4. ECU lockout system – Check as
follows:
A4
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