(4) On the sensor do a check of the circuit isolation.
(a) Connect the pins A and B together.
(b) Connect one test lead of the 50Vdc Isolation Tester to the pins AB and the other test lead to the case.
(c) Supply a test signal for 5 seconds and read the resistance value shown.
(d) The resistance value must be more than 400Megohms.
(5) If the proximity sensor 21GA or (23GA) fails one of the two tests at Para. 4.A.(3) and (4) replace the unserviceable proximity sensor (Ref. AMM TASK 32-31-73-000-001) (Ref. AMM TASK 32-31-73-400-001).
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(6) If the tests at Para.4.A.(3) and (4) are satisfactory then do a check of the aircraft wiring between the PROX SNSR 20GA (21GA) electrical connector and LGCIU-1 (2) ARINC tray (Ref. ASM 323103S01) (Ref. ASM 323104S01)
(7) If there is a circuit/interface fault do the repair.
(8) Do the L/G BITE test as in Para.3.A.
(9) If no fault is found at Para.4.A.(6), replace the LGCIU-1 (5GA1) LGCIU-2 (5GA2) (Ref. AMM TASK 32-31-71-000-001) (Ref. AMM TASK 32-31-71-400-001).
(10) Do the GROUND SCANNING and make sure that the ground log is clear.
5. Close-up
________
A. Put the aircraft back to its initial configuration.
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CES
TASK 32-31-00-810-815
NLG Compressed/Extended Proximity Sensor Fault (24GA, 25GA)
WARNING : MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING
_______
GEAR.
1. Possible Causes
_______________
- LGCIU-1 (5GA1)
- LGCIU-2 (5GA2)
- PROX SNSR-NLG EXT, SYS 1 (24GA)
- PROX SNSR-NLG EXT, SYS 2 (25GA)
- aircraft wiring
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION
-------------------------------------------------------------------------------
AMM 32-31-71-000-001 Removal of the LGCIU (5GA1, 5GA2)
AMM 32-31-71-400-001 Installation of the LGCIU (5GA1, 5GA2)
AMM 32-31-73-000-005 Removal of the NLG Proximity-Sensors 12GA, 13GA,
18GA, 19GA, 24GA, 25GA, 30GA, 31GA, 37GA (36GA), 39GA (38GA)
AMM 32-31-73-400-005 Installation of the NLG Proximity-Sensors 12GA, 13GA, 18GA, 19GA, 24GA, 25GA, 30GA, 31GA, 37GA (36GA), 39GA (38GA)
AMM 32-69-00-740-001 BITE Check Landing Gear Control Interface Unit (LGCIU) using MCDU to Ensure that Continuous BITE is Operative
ASM 32-31/03
ASM 32-31/04
3. Fault Confirmation
__________________
A. Test
(1) Do a BITE test on the LGCIU 1 (2) (Ref. AMM TASK 32-69-00-740-001) and look for the message, n l/g ext prox snsr 24ga (25ga):
(a) If the message is not shown during the BITE test, do a check for this fault on the Post Flight Report (PFR), after the next flight.
NOTE : If the message is shown on the next flight PFR, but the
____ BITE test in Para. (1) continues to find no fault on the ground, do the steps given in Para. 4.A.(3) and 4.A.(4).
May 01/05R CES
(b) If the message is shown during the BITE test, do the fault isolation procedure given in Para. 4.A.
4. Fault Isolation
_______________
A. Procedure
(1) Interchange LGCIU-1 and LGCIU-2 (Ref. AMM TASK 32-31-71-000-001) and (Ref. AMM TASK 32-31-71-400-001).
(2) Do the test given in Para. 3.A.
(a) If the fault goes, replace the initial LGCIU-1 (5GA1) or LGCIU-2 (5GA2), (Ref. AMM TASK 32-31-71-000-001) and (Ref. AMM TASK 32-31-71-400-001).
(b) Make sure that the serviceable LGCIU is installed in its initial postion.
(c) If the fault continues, do the next step.
(3) Replace the applicable sensor PROX SNSR-NLG EXT, SYS 1 (24GA) or PROX SNSR-NLG EXT, SYS 2 (25GA), (Ref. AMM TASK 32-31-73-000-005) and (Ref. AMM TASK 32-31-73-400-005):
(a) If the fault continues, do the next step.
(4) Do a check of the aircraft wiring (Ref. ASM 32-31/03) (Ref. ASM 32-31/04) and repair as necessary:
(a) Do the test given in Para. 3.A.
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