4. Fault Isolation
_______________

 A. Procedure
 (1) Make sure that the C/B 2QP is closed.

 (2) Open the C/B 1QP.

 (3) Get access to the ACTUATOR-TRANSFER VALVE, R REAR SPAR (12QP) (Ref. AMM TASK 28-15-51-000-002).

 (4) Disconnect the electrical connector 12QP-A from the ACTUATOR-TRANSFER VALVE, R REAR SPAR (12QP).

 (5) Do a test, with a multimeter, to see if 28VDC is available at pin A of the connector 12QP-A (Ref. ASM 28-15/01).

 (a) If the 28VDC:
 - is available, do step (6)

 - is not available, continue at step (7).

 (6) Do a check of and replace, if necessary, the ACTUATOR-TRANSFER VALVE, R REAR SPAR (12QP) (Ref. AMM TASK 28-15-51-000-002) and (Ref. AMM TASK 28-15-51-400-002).

 (a) When the actuator is removed from the aircraft make sure that the transfer valve drive shaft and valve are free to rotate.

 (b) Repair/replace all the unserviceable items found in (a).

 (c) Do the test given in Para. 3.A.(2).

 (7) Close the C/B 1QP.

 (8) Do a test, with a multimeter, to make sure that 28VDC is available at the RELAY-L WING TK LOW LEVEL CHANNEL A (5QP) terminals A2 and X1 (Ref. ASM 28-15/01).

 (a) If the 28VDC:
 - is not available, do step (9)

 - is available, continue at step (10).

 (9) Do a wiring check of the aircraft wiring (Ref. ASM 28-15/01) between the RELAY-L WING TK LOW LEVEL CHANNEL A (5QP) and the C/B-FUEL/XFR VALVE 1/WING/L (1QP).

 (a) Repair all the unserviceable wiring and connectors (Ref. ESPM 20-00-00).
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-049, 051-099, 101-149, 151-199, ∞∞28-15-00∞∞∞∞∞∞∞∞∞∞Page 219
 201-299, 401-499, Aug 01/05 CES

 (b) Do the test given in Para. 3.A.(2).

 (10) Do a test, with a multimeter, to make sure that 28VDC is available at the RELAY-R WING TK LOW LEVEL CHANNEL B (6QP) terminals A2 and X1 (Ref. ASM 28-15/01).

 (a) If the 28VDC:
 - is not available, do step (11)

 - is available, continue at step (12).

 (11) Do a wiring check of the aircraft wiring (Ref. ASM 28-15/01) between the RELAY-R WING TK LOW LEVEL CHANNEL B (6QP) and the C/B-FUEL/XFR VALVE 1/WING/R (2QP).

 (a) Repair all the unserviceable wiring and connectors (Ref. ESPM 20-00-00).

 (b) Do the test given in Para. 3.B.(2).

 (12) If the fault continues:

 (a) Do a check of and replace, if necessary, the relays that follow:

 - RELAY-R WING TK LOW LEVEL CHANNEL B (6QP)

 - RELAY-L WING TK LOW LEVEL CHANNEL A (5QP)

 - RELAY-L OR R REAR XFR VALVE OPEN LATCH (13QP).

 (b) Do the test given in Para. 3.B.(2).

 (13) If the fault continues:

 (a) Do a wiring check of the aircraft wiring (Ref. ASM 28-15/01) between:

 - the ACTUATOR connector 12QP-A, pin A and the RELAY 6QP, terminal A3

 - the ACTUATOR connector 12QP-A, pin A and the RELAY 5QP, terminal B3

 - the RELAY 6QP, terminal A1 and the RELAY 5QP, terminal B2

 - the RELAY 5QP, terminal X2 and the RELAY 13QP, terminal A

 - the RELAY 6QP, terminal X2 and the RELAY 13QP, terminal B

 - the RELAY 13QP, terminal 1, and the FLSCU-1 rack connector 7QJ-AA, pin 5A

 - the RELAY 13QP, terminal 3, and the FLSCU-2 rack connector 9QJ-AA, pin 5A.

 (b) Repair all the unserviceable wiring and connectors (Ref. ESPM 20-00-00).

 (c) Do the test given in Para. 3.B.(2).

 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-049, 051-099, 101-149, 151-199, ∞∞28-15-00∞∞∞∞∞∞∞∞∞∞Page 220
 201-299, 401-499, Aug 01/05 CES

 TASK 28-15-00-810-807

 Intercell XFR Valve Failure (Left Forward) - Open When Fuel Not Low Level
 WARNING : OBEY THE FUEL SAFETY PROCEDURES.
_______
 WARNING : WHEN YOU DO WORK ON THE FUEL SYSTEM WIRING, YOU MUST USE TEST
_______ EQUIPMENT THAT IS APPROVED (REFER TO INTERNATIONAL OR NATIONAL SPECIFICATIONS FOR INTRINSICALLY SAFE TEST EQUIPMENT, E.G. EN50-020, UL913 OR EQUIVALENT). TEST EQUIPMENT THAT IS NOT APPROVED CAN CAUSE FIRE OR AN EXPLOSION.
 1. Possible Causes
_______________
 - ACTUATOR-TRANSFER VALVE, L FWD SPAR (9QP)

 - aircraft wiring

 - RELAY-L WING TK LOW LEVEL CHANNEL B (7QP) 103VU
　
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