TANK VENTING SYSTEM - FAULT ISOLATION PROCEDURES
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TASK 28-12-00-810-801
Fuel - Unwanted Transfer From The Left Wing Tank To The Center Tank At Any Time
WARNING : OBEY THE FUEL SAFETY PROCEDURES.
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1. Possible Causes
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- PROTECTOR-OVERPRESSURE, CTR TK (96QM)
- VALVE-PRESSURE RELIEF, CTR TK (97QM)
- VALVE-REFUEL, CTR TK (10QU) R - CLACK VALVE (214QM) R - CLACK VALVE (216QM)
- C HI LEVEL SENSOR 20QJ
- left-wing surge-tank scavenge system
- jet adaptor assembly
- scavenge jet pump (66QM)
- check valve (37QM)
- center tank vent pipe R - left-wing surge-tank fuel return system
2. Job Set-up Information
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A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 28-00-00-000-001 Removal of the Fuel Pipes
AMM 28-00-00-400-001 Installation of the Fuel Pipes
AMM 28-11-00-790-003 Leak Test of the Center Tank
R AMM 28-11-42-000-002 Removal of the Clack Valve 214QM(216QM), 215QM(217QM)
R AMM 28-11-42-400-002 Installation of the Clack Valve 214QM(216QM),
R 215QM(217QM)
AMM 28-12-00-200-001 Inspection of the Tank Venting System AMM 28-12-41-000-003 Removal of the Overpressure Protector 96QM AMM 28-12-41-200-002 Inspection of the Overpressure Protector 96QM AMM 28-12-41-400-003 Installation of the Overpressure Protector 96QM AMM 28-21-43-000-003 Removal of the Fuel-Pump Check-Valve 37QM(38QM) AMM 28-21-43-400-003 Installation of the Fuel-Pump Check-Valve 37QM(38QM) AMM 28-21-53-000-001 Removal of the Jet Pump 66QM(69QM), 67QM(68QM) AMM 28-21-53-000-003 Removal of the Jet Adaptor Assembly AMM 28-21-53-400-001 Installation of the Jet Pump 66QM(69QM), 67QM(68QM) AMM 28-21-53-400-003 Installation of the Jet Adaptor Assembly AMM 28-25-00-710-003 Operational Test of the Refuel System AMM 28-25-45-000-001 Removal of the Center-Tank Pressure-Relief Valve
(97QM) AMM 28-25-45-400-001 Installation of the Center-Tank Pressure-Relief Valve (97QM)
「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 ∞∞28-12-00∞∞∞∞∞∞∞∞∞∞Page 201
Aug 01/04 CES -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 28-25-51-000-002 Removal of the Refuel Valve 10QU
AMM 28-25-51-400-002 Installation of the Refuel Valve 10QU
AMM 28-46-00-740-001 Functional (BITE) Test
AMM 51-76-12-300-001 Local Repair of the Fuel Tank Sealant
AMM 51-76-12-300-002 Repair of the Fuel Tank Fillet
SIL 57-0086
3. Fault Confirmation
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A. Prerequisite Test
(1) Open the REFUEL panel door 192MB/522KB/622KB (or if installed, at REFUEL panel 51VU, set the cockpit refuel PWR P/BSW (23QU) to on).
NOTE : This step is necessary to energize the 28VDC FUELING BUS. If
____ this step is not done the high level sensor channels will not be tested during the FLSS BITE test that follows.
(2) Do the FLSS BITE Test (Ref. AMM TASK 28-46-00-740-001).
(3) Examine the FLSS STATUS page for any of the FUEL LEVEL SENSING messages that follow:
- C HI LEVEL SENSOR 20QJ
- L(R) HI LEVEL SENSOR 17QJ1(2)
- FLSCU1(2) 7(9)QJ.
(4) If none of the messages given in step (3) are shown:
- go to Para. 4.
(5) If one or more of the messages given in step (3) are shown:
- troubleshoot the LRU(s) and then go to Para. 4. Refer to the Fault Symptoms, at the front of the TSM and/or chapter 28, for the related Task number.
4. Fault Isolation
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R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
A. Procedure
NOTE : Read all of the steps (1) and (2) before you start work.
____ The order in which the work steps are done is best decided by the maintenance staff in conjunction with: - other malfunction indications
- the fuel configuration
- the aircraft location.
「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 ∞∞28-12-00∞∞∞∞∞∞∞∞∞∞Page 202
Aug 01/05 CES
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