(c) At the panel 49VU, open and close the C/B L/G/LGCIU/SYS 1 (1GA) to make sure LGCIU-2 controls the L/G system.

 (d) Do an operational test of the L/G doors.

R (3) From the result of the two tests done in step (1):
 - if the two operational tests are OK, no more maintenance work is necessary.

 - if one of the operational tests is not OK, make a record of the system in which the fault occurred and do the isolation procedure in Para. 4.A.(1)

 - if the two operational tests are not OK, do the isolation procedure in Para. 4.A.(4)

 「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 213
 May 01/05 CES 4. Fault Isolation

_______________
 A. Procedure.
 (1) Interchange the LGCIU-1 (5GA1) with LGCIU-2 (5GA2), (Ref. AMM TASK 32-31-71-000-001) and (Ref. AMM TASK 32-31-71-400-001).

 (2) Do the operational tests in Para. 3.A. and make a record of the result:

 - if the fault stays in the same system, do step (4)

 - if the fault moves to the opposite system, do the next step.

 (3) Replace the LGCIU in the unserviceable system. Make sure that the servicable LGCIU is installed in its initial position.

 (a) Do the test in Para. 3.A.:
 - if the fault continues, do the next step.

 (4) Do a check for a leak from the hydraulic system, adjacent to the flexible hoses attached to the door actuator:

 - if there is no leak, do the next step.

 (5) Use a multimeter to do a check of the SEL-VALVE-L/G DOORS (41GA) solenoid, in the unserviceable system (Ref. ASM 32-31/05) (Ref. ASM 32-31/06):

 NOTE : Connector A is in System 1 and connector B is in System 2.
____
 (a) Do a check of the resistance between pins C and E. Do the check again for pins B and F. The resistance must be between 53 ohms and 78 ohms.

 (b) Connect together pins C and E, and connect together pins B and F.

 (c) Connect one test lead of the 50Vdc Isolation Tester to the pins C and E and the other test lead to pin D. Do the test again for pins B and F. The resistance value must be greater than 400 Megohms.

 (6) From the results of the two tests in step (5):

 - if the two tests are OK, do step (8)

 - if a solenoid fails one of the two tests do the next step.

 (7) Replace the SEL VALVE-L/G DOORS (41GA), (Ref. AMM TASK 32-31-34-000-001) and (Ref. AMM TASK 32-31-34-400-001):

 - if the fault continues, do the next step.

 (8) Do a check and repair the aircraft wiring between the LGCIU in the unserviceable system and the solenoid of the SEL-VALVE-L/G DOORS (41GA) (Ref. ASM 32-31/05) (Ref. ASM 32-31/06).

 「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 214
 May 01/05R CES

 (9) Do the operational test in Para. 3.A. for the unserviceable system only.
 - if the fault continues and the SEL-VALVE-L/G DOORS (41GA) has not been replaced, do step (7) only.
 「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 215
 May 01/05R
 CES

 TASK 32-31-00-810-808

 L/G and Doors Will Not Operate After Selection.
 WARNING : MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING
_______ GEAR.
 WARNING : PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU
_______ START A TASK ON OR NEAR:
 - THE FLIGHT CONTROLS

 - THE FLIGHT CONTROL SURFACES

 - THE LANDING GEAR AND THE RELATED DOORS

 - COMPONENTS THAT MOVE.

 1. Possible Causes
_______________
 - SAFETY VALVE-L/G SYS ISOLATION (49GA)

 - RELAY-HYDRAULIC CONTROL (48GA)

 - SEL VALVE-L/G (40GA)

 - aircraft wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 32-31-00-710-008 Operational Check to Ensure Safety Valve Closure AMM 32-31-00-720-002 Functional Test of the Normal Extension and
　
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