- 28VDC is at pin B
- 0VDC is at pin A.
(2) Open the C/B-FUEL/XFR VALVE 1/WING/L (1QP), A10 at 49VU.
(3) Check with a multimeter, at the electrical supply cable connector (Ref. ASM 28-15/01) to see if:
- 28VDC is at pin A
- 0VDC is at pin B.
(4) Close the C/B-FUEL/XFR VALVE 1/WING/L (1QP), A10 at 49VU.
(5) If the voltages at pins A and B of the connector are correct, (as in
(1) and (3) above), check/replace 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) While the actuator is removed from the aircraft confirm that the transfer valve drive shaft and valve are free to rotate.
(b) Repair/replace any unserviceable items found in (a).
(6) If no 28VDC is measured at either pins A and B of the electrical supply cable connector, (as in (1) and (3) above).
(a) Check with a multimeter to see if 28VDC is available at:
- terminal A2, RELAY-L WING TK LOW LEVEL CHANNEL A (5QP)
- terminal X1, RELAY-L WING TK LOW LEVEL CHANNEL A (5QP).
(b) If the 28VDC is not available do a wiring check (Ref. ASM 28-15/01) of the aircraft wiring between the RELAY-L WING TK LOW LEVEL CHANNEL A (5QP) and the C/B-FUEL/XFR VALVE 1/WING/L (1QP).
(c) Repair all the unserviceable wiring and connectors.
(d) Check with a multimeter to see if 28VDC is available at:
- terminal A2, RELAY-R WING TK LOW LEVEL CHANNEL B (6QP)
- terminal X1, RELAY-R WING TK LOW LEVEL CHANNEL B (6QP).
「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 278
201-299, 401-499, Aug 01/05 CES
(e) If the 28VDC is not available do a wiring check (Ref. ASM 28-15/01) of the aircraft wiring between the RELAY-R WING TK LOW LEVEL CHANNEL B (6QP) and the C/B-FUEL/XFR VALVE 1/WING/R (2QP).
(f) Repair all the unserviceable wiring and connectors.
(7) Do the test given in Para 3.A.
(8) If the fault continues, check/replace the RELAY-L WING TK LOW LEVEL CHANNEL A (5QP) 103VU.
(9) Do the test given in Para 3.A.
(10) If the fault continues check/replace the RELAY-R WING TK LOW LEVEL CHANNEL B (6QP) 103VU.
(11) Do the test given in Para 3.A.
(12) If the fault continues do a wiring check (Ref. ASM 28-15/01) of the aircraft wiring:
- between the pin A, ACTUATOR-TRANSFER VALVE, R REAR SPAR (12QP) and the terminal A3, RELAY-R WING TK LOW LEVEL CHANNEL B (6QP)
- between the pin A, ACTUATOR-TRANSFER VALVE, R REAR SPAR (12QP) and the terminal B3, RELAY-L WING TK LOW LEVEL CHANNEL A (5QP)
- between the terminal A1, RELAY-R WING TK LOW LEVEL CHANNEL B (6QP) and the terminal B2, RELAY-L WING TK LOW LEVEL CHANNEL A (5QP)
- between the pin B, ACTUATOR-TRANSFER VALVE, R REAR SPAR (12QP) and the terminal B1, RELAY-L WING TK LOW LEVEL CHANNEL A (5QP).
(13) Repair all the unserviceable wiring and connectors.
(14) Do the test given in Para 3.A.
「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 279
201-299, 401-499, Aug 01/05 CES
TASK 28-15-00-810-822
Intercell XFR System - Both Valves Show XX, CFDS (FUEL) Reports All Valves
WARNING : OBEY THE FUEL SAFETY PROCEDURES.
_______
1. Possible Causes_______________
- Left Wing Forward Intercell XFR VALVE 27QM/70QM/9QP failure
- Left Wing Rear Intercell XFR VALVE 28QM/71QM/11QP failure
- Right Wing Forward Intercell XFR VALVE 29QM/72QM/10QP failure
- Right Wing Rear Intercell XFR VALVE 30QM/73QM/12QP failure
2. Job Set-up Information______________________
A. Referenced Information
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REFERENCE DESIGNATION
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28-15-00-810-823 Intercell XFR System - Left Valve Shows XX, CFDS (FUEL) Reports L/FWD Valve
28-15-00-810-824 Intercell XFR System - Left Valve Shows XX, CFDS (FUEL) Reports L/REAR Valve
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