AVIONICS MASTER PWR

IGNITION AND ENGINE START - TM-1-1510-225-MTF_37

TM-1-1510-225-MTF Army Model C-12 Aircraft Manual
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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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