-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 32-31-73-200-001 Inspection of the MLG Proximity Sensor and Target Clearances AMM 32-31-73-200-002 Inspection of the NLG Proximity Sensor and Target Clearances
 AMM 32-31-73-400-001  Installation of the Proximity-Sensors 9GA(8GA), 11GA(10GA), 27GA(26GA), 29GA(28GA), 15GA(14GA), 17GA(16GA), 21GA(20GA), 23GA(22GA), 33GA(32GA)...
 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. Test
 (1) If there is a target position fault message on the post flight report, do the fault isolation.
 NOTE : MLG and NLG uplock proximity sensors are inside the uplock
____
 assembly and can not be adjusted.

 NOTE : GROUND SCANNING will show target position fault messages when
____ the L/G doors are opened for maintenance. Thus these messages can be ignored, unless they occur during a L/G extension/retraction test.
 4. Fault Isolation
_______________
 A. Procedure
 (1) Do the inspection of the applicable L/G proximity sensor, referred to in the fault message, and adjust as necessary:
 (a) For the MLG proximity sensor faults (14GA; 15GA; 16GA; 17GA; 20GA; 21GA; 22GA; 23GA; 32GA; 33GA; 34GA; 35GA) do The Inspection of the MLG Proximity Sensor and Target Clearances (Ref. AMM TASK 32-31-73-200-001).

 (b) For the NLG proximity sensor faults (18GA; 19GA; 24GA; 25GA; 36GA; 37GA; 38GA; 39GA) do The Inspection of the NLG Proximity Sensor and Target Clearances (Ref. AMM TASK 32-31-73-200-002).

 NOTE : The proximity switches on L/G uplocks and L/G door uplocks
____ (8GA; 9GA; 10GA; 11GA; 12GA; 13GA; 26GA; 27GA; 28GA; 29GA;
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 Aug 01/05R CES

 30GA; 31GA) are part of the uplock assembly. Thus they cannot be examined or adjusted.
 (2) Do a check of the inductance of the applicable proximity sensor (Ref. AMM TASK 32-31-73-820-008).

 - if the inductance is not OK, do step (4)

 - if the inductance is OK, do next step.

 (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 do a check of the resistance between the pins A and B of the applicable proximity sensor, (Ref. ASM 32-31/03) and (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 the 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 two resitance values are correct, do step (6)

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

 (4) Replace the applicable Proximity Sensor:

 - to replace an NLG proximity sensor (Ref. AMM TASK 32-31-73-000-005) and (Ref. AMM TASK 32-31-73-400-005)

 - to replace an MLG proximity sensor (Ref. AMM TASK 32-31-73-000-001) and (Ref. AMM TASK 32-31-73-400-001)

 NOTE : When an uplock proximity-sensor is replaced, because of an
____ inductance fault, it is necessary to check the inductance of the new sensor (after it has been installed). This is because, if the inductance continues to be incorrect after the sensor has been replaced, then the fault is with the sensor/target gap inside the uplock assembly. Thus, if the inductance of the new sensor is also not correct, the complete uplock must be replaced.
 (5) If an uplock proximity sensor is replaced, do a check of the inductance of the new replacement sensor:
 - if the inductance is OK, no more maintenance work is necessary

 - if the inductance is not OK, 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 A220
　
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