TM 1–1520–238–T–2
2–178
Change 6
Table 2–1.
Master Failure Symptom Index (cont)
Failure Symptom
MOC
Reference
TEST GO INDICATOR ON AN/APM–378
TRANSPONDER TEST SET DOES NOT LIGHT
(PILOT IFF TRANSPONDER CONTROL
PANEL: ANT SWITCH SET TO BOT, MODE 1,
2, AND 3/A TESTS PERFORMED)
TM 11–1520–238–23–2
IFF SYSTEM
TEST GO INDICATOR ON AN/APM–378
TRANSPONDER TEST SET DOES NOT LIGHT
ON MODE 1, 2, AND 3/A (PILOT IFF
TRANSPONDER CONTROL PANEL: MODE 1,
2, AND 3/A TESTS PERFORMED)
TM 11–1520–238–23–2
IFF SYSTEM
TEST/GO, MODE 4 REPLY AND TEST/MON
NO–GO INDICATORS DO NOT LIGHT (PILOT
IFF TRANSPONDER CONTROL PANEL:
MODE 4 TEST SWITCH SET TO OUT AND
EACH INDICATOR PRESSED)
TM 11–1520–238–23–2
IFF SYSTEM
TEST/MON NO–GO INDICATES OR IFF
INDICATORS LIGHT (PILOT IFF
TRANSPONDER CONTROL PANEL: M–3A
SWITCH SET TO ON AND M–C SWITCH
HELD TO TEST)
TM 11–1520–238–23–2
IFF SYSTEM
TEST/MON NO–GO INDICATOR LIGHTS (PILOT
IFF TRANSPONDER CONTROL PANEL:
MODE 4 CODE SWITCH SET TO B)
TM 11–1520–238–23–2
IFF SYSTEM
TEST/MON NO–GO INDICATOR LIGHTS (PILOT
IFF TRANSPONDER CONTROL PANEL:
MODE 4 CODE SWITCH SET TO B)
(AN/APM–424 TRANSPONDER TEST SET:
TEST SEQ SWITCH PRESSED AND
RELEASED)
TM 11–1520–238–23–2
IFF SYSTEM
TEST/MON NO–GO INDICATOR LIGHTS (PILOT
IFF TRANSPONDER CONTROL PANEL:
MODE 4 CODE SWITCH SET TO ON)
TM 11–1520–238–23–2
IFF SYSTEM
TEST/MON NO–GO INDICATORS ON IFF
TRANSPONDER LIGHTS (PILOT IFF
TRANSPONDER CONTROL PANEL: MODE 4
CODE SWITCH SET TO ON) (AN/APM–424
TRANSPONDER TEST SET: TEST SEQ
SWITCH PRESSED AND RELEASED)
TM 11–1520–238–23–2
IFF SYSTEM
