(6) If the fault continues:
(a) Remove the CTL PNL-REFUEL/DEFUEL (800VU) (Ref. AMM TASK 28-25-55-000-001).
(b) Use a multimeter to do a test, to make sure that 28VDC is available between the end connector 4023VC-A, pin Y (+ve) and 4024VC-A, pin <J.
(c) If the 28VDC supply volage is correct, replace the CTL PNL-REFUEL/DEFUEL (800VU) (Ref. AMM TASK 28-25-55-000-001) and (Ref. AMM TASK 28-25-55-400-001).
NOTE : If due to airline operational conditions it is not
____ possible to replace the CTL PNL-REFUEL/DEFUEL (800VU) and internal trouble-shooting is required, go to step (7).
(7) Do a check of and replace, if necessary:
(a) The ANN LT-DEFUEL/XFR/OPEN (21QU)
(b) The diode between pins 7 and 8 (part of diode module 4001VD).
(8) Do a check of the CTL PNL-REFUEL/DEFUEL (800VU) wiring (Ref. ASM 28-25/01) and (Ref. ASM 28-25/03) between the connectors and components, as shown in the table that follows:
NOTE : The circuit connections shown in the table are abbreviated,
____
for example:
- the connector 4023VC, pin Y is shown as 4023VC-Y
- the switch 2QJ, terminal 3A is shown as 2QJ-3A
- the terminal block 4001VT, terminal 1G is shown as 4001VT-1G
- the diode module 4001VD, terminal 8 is shown as 4001VD-8.
-----------------------------------------------------------------------------
| CONNECTOR-PIN | COMPONENT TO COMPONENT | CONNECTOR-PIN |
|-----------------------------------------------------------------------------|
| 4023VC-Y ---------------------------------------- 4001VT-1G |
| 4001VT-1H ---------------------- 21QU-4 |
| 21QU-5 ------------------------- 21QU-III |
| 21QU-III ----------------------- 21QU-I |
| 21QU-I ------------------------- 21QU-II |
| 21QU-II ------------------------ 4001VT-5A |
| 4001VT-5B ---------------------- 4001VD-7 |
| 4001VD-8 ----------------------- 4001VT-4C |
| 4001VT-4B ---------------------- 2QJ-3A |
| 2QJ-1A ------------------------------------- 4024VC-<J |
-----------------------------------------------------------------------------
(a) Repair all the unserviceable wiring and connectors.
(b) Do the test given in Para. 3.B.
「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 ∞∞28-25-00∞∞∞∞∞∞∞∞∞∞Page 248
Nov 01/04R CES
TASK 28-25-00-810-816
Refuel - Fuel Spillage From NACA Vent During Refuel
WARNING : OBEY THE FUEL SAFETY PROCEDURES.
_______
CAUTION : DO NOT LET THE REFUEL PRESSURE BE MORE THAN THE MAXIMUM SAFE PRESSURE
_______
OF 50psi (3.45bar).
1. Possible Causes
_______________
- VALVE-REFUEL, CTR TK (10QU)
- VALVE-REFUEL, R WING TK (8QU)
- VALVE-REFUEL, L WING TK (7QU)
- VALVE-DEFUEL/TRANSFER (11QM)
- JET PUMP-WATER SCAVENGE, L VENT SURGE TK (66QM)
- JET PUMP-WATER SCAVENGE, R VENT SURGE TK (69QM)
- CHECK VALVE-FUEL PUMP, L VENT SURGE TK (37QM)
- CHECK VALVE-FUEL PUMP, R VENT SURGE TK (38QM)
- CLACK VALVE (214QM)
- CLACK VALVE (216QM)
- CLACK VALVE (215QM)
- CLACK VALVE (217QM)
- FLSS high level channel(s)
- the incoming fuel pressure is more than 55psi (3.79bar)
- a fuel tank (one or more) becomes full and the fuel flow, refuel or transfer (in), is not stopped
- Obstruction (blockage)
- Overpressure Protector
- Refuel System
- Defuel System
- Crossfeed Valve
- vent/surge tank scavenge system
- jet adaptor assembly
- engine fuel feed line, Air Release Valve
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
28-21-00-810-825 Internal Fuel Leak Which Causes a Fuel Imbalance or a
Discharge From a NACA Vent During Taxi or Flight AMM 12-11-28-650-003 Pressure Refuel with Automatic Control AMM 12-11-28-650-004 Pressure Refuel with Manual Control AMM 12-11-28-650-005 Pressure Refuel without Electrical Power AMM 12-11-28-650-006 Overwing (Gravity) Refuel AMM 28-00-00-000-001 Removal of the Fuel Pipes AMM 28-00-00-400-001 Installation of the Fuel Pipes
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