TM 1–1520–238–T–2
Change 1
2–3
Table 2–1.
Master Failure Symptom Index (cont)
Failure Symptom
Reference
MOC
ACCEPT INDICATOR ON AN/APM–378
TRANSPONDER TEST SET DOES NOT LIGHT
(PILOT IFF TRANSPONDER CONTROL
PANEL: MODE 4 TEST SWITCH SET TO ON)
TM 11–1520–238–23–2
IFF SYSTEM
ACCEPT INDICATOR ON AN/APM–378
TRANSPONDER TEST SET DOES NOT LIGHT
(PILOT IFF TRANSPONDER CONTROL
PANEL: RAD TEST SWITCH SET TO RAD
TEST)
TM 11–1520–238–23–2
IFF SYSTEM
ACCEPT INDICATOR ON AN/APM–378
TRANSPONDER TEST SET DOES NOT LIGHT
(PILOT IFF TRANSPONDER CONTROL
PANEL: MODE 4 SWITCH SET TO B)
(AN/APM–424 TRANSPONDER TEST SET:
TEST SEQ SWITCH PRESSED AND
RELEASED)
TM 11–1520–238–23–2
IFF SYSTEM
ADF AUDIO CANNOT BE ADJUSTED USING
VOL CONTROL (ADF CONTROL PANEL:
MODE CONTROL SET TO ANT, MAN/2128/500
CONTROL SET TO MAN, FREQUENCY
CONTROLS SET TO DESIRED STATION,
TEST/TONE SWITCH SET TO CENTER AND
VOL CONTROL SET AS DESIRED)
TM 11–1520–238–23–2
AUTOMATIC
DIRECTION FINDER
(ADF) AN/ARN–149
ADF AUDIO IN PILOT AND CPG HEADSET IS
NOT PRESENT (ADF CONTROL PANEL:
MODE CONTROL SET TO ANT, MAN/2128/500
CONTROL SET TO MAN, FREQUENCY
CONTROLS SET TO DESIRED STATION,
TEST/TONE SWITCH SET TO CENTER AND
VOL CONTROL SET AS DESIRED)
TM 11–1520–238–23–2
AUTOMATIC
DIRECTION FINDER
(ADF) AN/ARN–149
ADF CONTROL PANEL EDGE–LIGHT DOES
NOT LIGHT (PILOT EXT LT/INTR LT PANEL:
R/CTR CSL CONTROL SET TO BRT)
TM 11–1520–238–23–2
AUTOMATIC
DIRECTION FINDER
(ADF) AN/ARN–149
ADF RCVR CONTROL PANEL EDGE LIGHT
DOES NOT LIGHT (PILOT EXT LT/INTR LT
PANEL: R/CTR CSL CONTROL ROTATED TO
BRT)
TM 11–1520–238–23–2
AUTOMATIC
DIRECTION FINDER
(ADF) AN/ARN–89
