Table 2–1. Master Failure Symptom Index (cont)

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