R L/G downlock, ground position, target near, L/G locked. R -----------------------------------------------------------------------------R FIN FUNCTION DESIGNATION ASM REFERENCE CKT PROX SNSR R -----------------------------------------------------------------------------
R 7GD1-4 RELAY, BRAKE FAN CNTL 324801S01 LHD 1 17GA
R 1SQ1 WINDSHEAR RADAR 344102S03 LHD 1 17GA
R 1SQ2 WINDSHEAR RADAR 344102S03 LHD 1 17GA
R
R 101RH CIDS DIRECTOR COMMS 237303S01 MD 1 16GA + 17GA
R
R 1GT1 WEIGHT AND BALANCE 314402S01 ND 3 19GA
R 10GG BRAKE STEER CNTL UNIT 325101S01 ND 3 19GA
R 334601S01 ND 1 19GA
R
R -----------------------------------------------------------------------------
R **ON A/C ALL
5. Trouble shooting LGCIU discrete output faults.
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A. Procedure
(1) Para. 3 and 4 shows the LRU's that receive A/C on ground or A/C in flight circuit closed/circuit open conditions that are set by the LGCIU's.
(2) The procedure that follows gives a standard fault confirmation/isolation for all LGCIU discrete circuit faults.
(a) Look at the AVIONICS STATUS page.
(b) If the avionics status report shows a group of LRU's with external class 1, 2 or class 3 faults, access the relevant system report to find if the message is LGCIU related.
(c) Go to the applicable Para. 3 or 4 and find the LRU to transistor drive group correlation. The ASM 326201S01 and the ASM 326302S01 gives the equipment interconnection and group details.
(d) If the faulty LRU's group to a 'ONE' function or an 'AND' function transistor marker (e.g MC 4 or LHC 3 ), then the fault is with the LGCIU.
(e) If the faulty LRU's group to a 'ONE' function and to an 'AND' function (e.g MC 4 and RHC 3) then the fault is with a proximity sensor.
(f) To find the identity of the failed proximity sensor.
(g) Use the table in Para. 3 or 4 to correlate the LRU's to the 'ONE' and the 'AND' functions of the LGCIU to find the failed proximity sensor.
(h) If there is only one LRU fault to a 'ONE' function or to an 'AND' function, then the fault is with the LRU.
6. Trouble shooting proximity sensor and/or related circuit faults.
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A. Procedure
(1) The test equipment used is:
- the ELDEC trouble shooting unit model 38-368-02.
- the ELDEC calibration target GO GAUGE P/N 8-751-01.
(2) To test a proximity sensor.
(a) Disconnect the electrical connector from the applicable sensor.
(b) Connect the terminals of the test box to pins A and B of the applicable sensor.(use a two wire lead terminated at one end with a ASNE0052R883ASNE connector or equivalent).
(c) Turn the tester POWER switch to ON.
(d) The test unit should now show TARGET FAR.
(e) Put the calibrated target into contact with the proximity sensor.
(f) The test unit should now show TARGET NEAR.
(g) These results are for a serviceable proximity sensor.
(3) To test the related electrical circuit after a 'NO FAULT FOUND' condition for the proximity sensor.
(a) Connect the aircraft electrical connector to the applicable proximity sensor. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320 Trouble Shooting Manual 排故手册 起落架 LANDING GEAR 1(92)
