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IGNITION AND ENGINE START | Up
TM-1-1510-225-MTF Army Model C-12 Aircraft Manual | Next
BEFORE TAXIING |
CAUTION
TM
1-1510-225-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
SECOND ENGINE START (GPU START) (CONT)
*15. AC/DC power - Check
(a) AC frequency 380 to 420 Hz.
(b) AC voltage - 105 to 120 VAC.
(c) DC voltage - 27.5 to 29.0 VDC.
(d) DC loads: Parallel within 10%.
(1) 75% maximum - Low Idle.
(2) 85% maximum - High Idle.
(3) 85% maximum - Ground
Operations.
16. AVIONICS MASTER PWR - ON.
17. EFIS POWER switches - ON.
18. AP/TRIM POWER switch - ON.
19. Autopilot self-test - Monitor.
(a) Allow 3-4 minutes for gyros to
erect, HDG and ATTITUDE
flags clear.
(b) AP FAIL and AP TRIM FAIL -
Annunciators illuminate upon
initial application of AP/TRIM
POWER and then extinguish
(followed by an audio test tone)
after successful completion of
the self-test. Allow 60 seconds
after gyros are valid.
Taxi with caution. The autopilot temporarily
engages the servos during the automatic self-test.
Be prepared to overpower the autopilot as
required.
2-24
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