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 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 32-31-73-820-008 Inductance Check of the Proximity Sensors/Switches ASM 32-31/03 ASM 32-31/04
 3. Fault Confirmation
__________________
 A. Message Analysis
 (1) If the message: L or R or N L/G UPLK PROX SNSR XXGA TGT POS or L or R or N L/G DOOR CLOSED PROX PROX SNSR XXGA TGT POS (where XX is _8, _9, 10, 11, 12, 13, 26, 27, 28, 29, 30, or 31) is shown on the Post Flight Report (PFR), do the fault isolation procedure in Para. 4.A.
 NOTE : Target position faults can only be confirmed by continuous
____ BITE during L/ G operation. To confirm a target position fault on the ground, it is necessary to do the fault isolation procedure.
 4. Fault Isolation
_______________
 A. Procedure
 NOTE : Uplock proximity sensors are a part of the uplock assembly and can
____
 not be adjusted.

 (1) Do a check of the inductance of the applicable proximity-sensor (Ref. AMM TASK 32-31-73-820-008):

 - if the inductance is OK, do step (3)

 - if the inductance is not OK and a sensor is replaced, do the next step.

 

 (2) Do a check of the inductance of the new replacement sensor:

 - if the inductance is not correct, do step (6)

 - if the inductance is correct, no more maintenance work is necessary.

 

 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞32-31-00∞∞∞∞∞∞∞∞∞∞Page 291
 May 01/05R CES

 NOTE : If the inductance of the proximity-sensor continues to be
____ incorrect after replacement, then the fault is with the sensor/target gap which cannot be adjusted. Thus the complete uplock must be replaced.
 (3) Do a check of the resistance of the applicable proximity-sensor

 (a) At the applicable proximity-sensor, release the electrical connector.

 (b) Use a multimeter and measure the resistance between the pins A and B of the applicable proximity-sensor, (Ref. ASM 32-31/03) or (Ref. ASM 32-31/04). The resistance must be approximately 13 ohms.

 (c) Connect pins A and B together.

 (d) Connect one test lead of a 50Vdc Isolation Tester to the pins AB and the other test lead to the case.

 (e) Supply a test signal for 5 seconds and read the resistance value shown. The resistance value must be more than 400 Megohms.

 (f) From the resistance checks in steps (b) and (e):

 - if the resistance values are correct, do step (5)

 - if one or more of the resistance values is not correct, do the next step.

 

 

 (4) Replace the applicable proximity sensor:

 - for the proximity-sensors 8GA, 9GA, 10GA, 11GA, 26GA, 27GA, 28GA or 29GA (Ref. AMM TASK 32-31-73-000-001) and (Ref. AMM TASK 32-31-73-400-001)

 - for the proximity-sensors 12GA, 13GA, 30GA or 31GA (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.

 (5) Do the applicable functional or operational test that follows:

 - for the proximity-sensors 8GA, 9GA, 10GA, 11GA, 12GA or 13GA, do the Funct ional Test of the Normal Extension and Retraction of the Landing Gear (Ref. AMM TASK 32-31-00-720-002)

 - for the proximity-sensors 26GA, 27GA , 28GA, 29GA, 30GA or 31GA, do the Operational Test of the Landing Gear Doors (Ref. AMM TASK 32-31-00-710-002).

 

 (a) If the fault continues do the next step.
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞32-31-00∞∞∞∞∞∞∞∞∞∞Page 292
 May 01/05R
 CES

 (6) Replace the applicable uplock assembly as follows:

 - for the proximity sensors 9GA, 11GA or (8GA, 10GA) replace UPLOCK ASSY-MLG, L (2509GM) or (UPLOCK ASSY-MLG, R (2510GM)), (Ref. AMM TASK 32-31-44-000-001) and (Ref. AMM TASK 32-31-44-400-001)

 - for the proximity sensors 12GA, 13GA replace UPLOCK ASSY-NLG (2530GM), (Ref. AMM TASK 32-31-21-000-001) and (Ref. AMM TASK 32-31-21-400-001)

 - for the proximity sensors 27GA, 29GA or (26GA, 28GA) replace UPLOCK ASSY-MLG DOOR, L (2521GM) or (UPLOCK ASSY-MLG DOOR, R (2520GM)), (Ref. AMM TASK 32-31-33-000-001) and (Ref. AMM TASK 32-31-33-400-002)

 - for the proximity sensors 30GA, 31GA replace UPLOCK ASSY-NLG DOOR (2534GM), (Ref. AMM TASK 32-31-14-000-001) and (Ref. AMM TASK 32-31-14-400-001).

 (a) If the fault continues, do the next step.
　
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