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16. Standby attitude indicator | Up
TM-1-1520-238-MTF Maintenance Test Flight Manual Helicopter Attack
AH-64A Apache | Next
AFTER STARTING APU (CONT) |
TM 1-1520-238-MTF
2-19
Change 3
PROCEDURE
TROUBLESHOOTING
REFERENCE
AFTER STARTING APU (CONT)
*19. Avionics – On, test, program as
required.
NOTE
Procedures for testing the AN/ARN-149
ADF are in paragraph b.
*a. AN/ARN-89 ADF Radio – Test as
follows:
(1) ANT mode operation:
(a) Mode selector – ANT.
(b) Frequency – Select and
tune.
(c) CW-VOICE-TEST switch –
CW. Note detectable BFO
tone in headset.
(d) Tune around selected
station frequency and
check that BFO tone does
vary. Set to null.
(e) CW-VOICE-TEST switch –
As desired.
(f) Mode selector – As
desired.
(2) COMP mode operation:
(a) Mode selector – COMP.
(b) CW-VOICE-TEST switch –
CW or VOICE as
appropriate for the received
signal.
(c) AUDIO control – Verify
range of control. Set as
desired.
B
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