LCD FAULT CODES IN THE TABLE ARE FOR EXTERNAL FAULTS, INTERNAL LRU FAULT CODES ARE NOT LISTED.
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VOR/MB/MMR/DME/RA/VHF COMM - FAULT CODE TABLES RADIO ALTIMETER ALA-52B
FAULT DESCRIPTION FAULT ORIGIN FAULT MEANING LCD FAULT CODE
SYSTEM SELECT 1 EXTERNAL TO LRU SYSTEM SELECT PIN (MPB5) IS CONNECTED TO A.C GND. IT SHOULD BE CONNECTED TO SYSTEM SELECT COMMON PIN (MPC5). Aa
SYSTEM SELECT 2 EXTERNAL TO LRU SYSTEM SELECT PIN (MPB6) IS CONNECTED TO A.C GND. IT SHOULD BE CONNECTED TO SYSTEM SELECT COMMON PIN (MPC5). Ab
AID 57 EXTERNAL TO LRU SYSTEM A.I.D. 57 FOOT PIN (MPE3) IS CONNECTED TO A/C GND. IT SHOULD BE CONNECT TO A.I.D. COMMON (MPF2). Ae
TX ANTENNA FAULT EXTERNAL TO LRU SYSTEM TRANSMIT ANTENNA/CABLE IS OPEN, SHORTED, OR DISCONNECTED Em
RX ANTENNA FAULT EXTERNAL TO LRU SYSTEM TRANSMIT ANTENNA/CABLE IS OPEN, SHORTED, OR DISCONNECTED En
INDICATOR #1 FAILURE EXTERNAL TO LRU SYSTEM INDICATOR #1 INPUT PIN (MPF5) IS OPEN TO GROUND. Je
INDICATOR #2 FAILURE EXTERNAL TO LRU SYSTEM INDICATOR #2 INPUT PIN (MPF6) IS OPEN TO GROUND. Jf
LCD FAULT CODES IN THE TABLE ARE FOR EXTERNAL FAULTS, INTERNAL LRU FAULT CODES ARE NOT LISTED.
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VOR/MB/MMR/DME/RA/VHF COMM - FAULT CODE TABLES VHF VOICE/DATA TRANSCEIVER RTA-44D
FAULT DESCRIPTION FAULT ORIGIN FAULT MEANING LCD FAULT CODE
SDI 0 PROGRAM EXTERNAL TO LRU SYSTEM PRGM PIN (MP-9A) IS CONNECTED TO A/C GND. IT SHOULD BE CONECTED TO SDI COMMON PIN (MP-9C). Aa
SDI 1 PROGRAM EXTERNAL TO LRU SYSTEM PRGM PIN (MP-9B) IS CONNECTED TO A/C GND. IT SHOULD BE CONECTED TO SDI COMMON PIN (MP-9C). Ab
NO PORT “A” TUNING DATA EXTERNAL TO LRU SYSTEM NO 429 TUNING DATA AVAILABLE AT FREQ/FUNCTION SELECT DATA INPUT “A.” PINS (MP-11A AND MP-11B). Qe
NO PORT “B” TUNING DATA EXTERNAL TO LRU SYSTEM NO 429 TUNING DATA AVAILABLE AT FREQ/FUNCTION SELECT DATA INPUT “B.” PINS (MP-7A AND MP-7B) Qf
INVALID TUNING “A” EXTERNAL TO LRU SYSTEM DATA IS AVAILABLE AT PORT “A” BUT IT IS NOT VALID. Qg
INVALID TUNING “B” EXTERNAL TO LRU SYSTEM DATA IS AVAILABLE AT PORT “B” BUT IT IS NOT VALID. Qh
LCD FAULT CODES IN THE TABLE ARE FOR EXTERNAL FAULTS, INTERNAL LRU FAULT CODES ARE NOT LISTED.
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