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19. Avionics | 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
Change 3
2-20
PROCEDURE
TROUBLESHOOTING
REFERENCE
AFTER STARTING APU (CONT)
(d) Note HSI and RMI bearing
indications are within ± 5°
of station bearing (if
known).
NOTE
Direction of rotation during TEST and with
switch released is indicative of signal
strength and shortest distance to rotate, re-
spectively.
(e) CW-VOICE-TEST switch –
TEST. Note HSI and RMI
bearing indicators rotate
180° ± 5°.
(f) CW-VOICE-TEST switch –
CW or VOICE as
appropriate. Note bearing
pointers return to previously
noted bearing ± 5°.
(3) LOOP mode operation:
(a) Mode selector – LOOP.
NOTE
Audio tone should increase and decrease
approximately each 90° from originally
noted bearing.
(b) LOOP L-R control – Adjust
to obtain null. Adjust to
obtain the opposite null
approximately 180° from
original bearing.
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