TM 1–1520–238–T–2
2–94
Change 1
Table 2–1.
Master Failure Symptom Index (cont)
Failure Symptom
MOC
Reference
HSI BEARING DOES NOT CHANGE (ADF RCVR
CONTROL PANEL: CW/VOICE/TEST SWITCH
SET TO TEST)
TM 11–1520–238–23–2
AUTOMATIC
DIRECTION FINDER
(ADF) AN/ARN–89
HSI BEARING POINTER IS NOT STABLE (RAI:
PITCH TRIM CONTROL ADJUSTED)
TM 11–1520–238–23–2
HARS
HSI BEARING POINTER NO. 1 IS NOT AT 3
O’CLOCK POSITION (HARS PANEL: ALIGN
SWITCH SET TO OPR)
TM 11–1520–238–23–2
NAVIGATION
INSTRUMENTS
HSI BEARING POINTER NO. 2 AND RMI
BEARING POINTER DO NOT PARK (ADF
CONTROL PANEL: ADF TUNED TO UNUSED
FREQUENCY)
TM 11–1520–238–23–2
AUTOMATIC
DIRECTION FINDER
(ADF) AN/ARN–149
HSI BEARING POINTER NO. 2 AND RMI
BEARING POINTER DO NOT ROTATE 90
DEGREES FROM PREVIOUS BEARING (ADF
CONTROL PANEL: TEST/TONE SWITCH SET
TO TEST)
TM 11–1520–238–23–2
AUTOMATIC
DIRECTION FINDER
(ADF) AN/ARN–149
HSI BEARING POINTER NO. 2 AND RMI
BEARING POINTER DO NOT ROTATE (ADF
CONTROL PANEL: TEST/TONE SWITCH SET
TO TEST)
TM 11–1520–238–23–2
AUTOMATIC
DIRECTION FINDER
(ADF) AN/ARN–149
HSI BEARING POINTER NO. 2 AND RMI
BEARING POINTER ROTATE, BUT
INACCURATE (ADF CONTROL PANEL: MODE
CONTROL SET TO ADF)
TM 11–1520–238–23–2
AUTOMATIC
DIRECTION FINDER
(ADF) AN/ARN–149
HSI BEARING POINTER NO. 2 DOES NOT
MOVE (ADF RCVR CONTROL PANEL: LOOP
CONTROL ADJUSTED)
TM 11–1520–238–23–2
AUTOMATIC
DIRECTION FINDER
(ADF) AN/ARN–89
HSI BEARING POINTER NO. 2 DOES NOT
MOVE, AUDIO VOLUME DOES NOT
INCREASE AND DECREASE, OR TUNE
METER NEEDLE DOES NOT MOVE UP AND
DOWN (ADF RCVR CONTROL PANEL: MODE
SWITCH SET TO LOOP AND LOOP
CONTROL ADJUSTED)
TM 11–1520–238–23–2
AUTOMATIC
DIRECTION FINDER
(ADF) AN/ARN–89
