4. Fault Isolation
_______________

 A. Procedure
 (1) Make sure that the C/B 3QP is closed.

 (2) Open the C/B 4QP.

 (3) Get access to the ACTUATOR-TRANSFER VALVE, L FWD SPAR (9QP) (Ref. AMM TASK 28-15-51-000-001).

 (4) Disconnect the electrical connector 9QP-A from the ACTUATOR-TRANSFER VALVE, L FWD SPAR (9QP).

 (5) Do a test, with a multimeter, to see if 28VDC is available at pin A of the connector 9QP-A (Ref. ASM 28-15/02).

 (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, L FWD SPAR (9QP) (Ref. AMM TASK 28-15-51-000-001) and (Ref. AMM TASK 28-15-51-400-001).

 (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.B.(2).

 (7) Close the C/B 4QP.

 (8) Do a test, with a multimeter, to make sure that 28VDC is available at the RELAY-L WING TK LOW LEVEL CHANNEL B (7QP) terminals A2 and X1 (Ref. ASM 28-15/02).

 (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 28-15/02) between the RELAY-L WING TK LOW LEVEL CHANNEL B (7QP) and the C/B-FUEL/XFR VALVE 2/WING/L (3QP).

 (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 207
 201-299, 401-499, Aug 01/05 CES

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

 (10) Do a test, with a multimeter, to make sure that 28VDC is available at the RELAY-R WING TK LOW LEVEL CHANNEL A (8QP) terminals A2 and X1 (Ref. ASM 28-15/02).

 (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 28-15/02) between the RELAY-R WING TK LOW LEVEL CHANNEL A (8QP) and the C/B-FUEL/XFR VALVE 2/WING/R (4QP).

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

 - RELAY-R WING TK LOW LEVEL CHANNEL A (8QP)

 - RELAY-L OR R FWD XFR VALVE OPEN LATCH (14QP).

 (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 28-15/02) between:

 - the ACTUATOR connector 9QP-A, pin A and the RELAY 7QP, terminal A3

 - the ACTUATOR connector 9QP-A, pin A and the RELAY 9QP, terminal B3

 - the RELAY 7QP, terminal A1 and the RELAY 8QP, terminal B2

 - the RELAY 7QP, terminal X2 and the RELAY 14QP, terminal A

 - the RELAY 8QP, terminal X2 and the RELAY 14QP, terminal B

 - the RELAY 14QP, terminal 1 and the FLSCU-2 rack connector 9QJ-AA, pin 11B

 - the RELAY 14QP, terminal 3 and the FLSCU-1 rack connector 7QJ-AA, pin 11B.

 (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 208
 201-299, 401-499, Aug 01/05 CES

 TASK 28-15-00-810-804

 Intercell XFR Valve 28QM/71QM/11QP (Left Rear) Fault - Stays Closed When The Fuel In The Inner-cell Is At 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 REAR SPAR (11QP)
　
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