(2) Do the Operational Test of the Wing Tank Pump Pressure Sense Line Check Valves (Ref. AMM TASK 28-21-00-710-002).
 NOTE : It is important to carefully examine the related fuel-pump
____ push button switch (P/BSW) when the fuel-pumps are switched on. This is to make sure that the FAULT indication shows momentarily (if the check valves are operating correctly).
 4. Fault Isolation
_______________
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 A. If during the test in Para. 3.A.(2):
 (1) The FAULT indication of the P/BSW-FUEL/L TK PUMPS/1 (13QA) fails to momentarily show:

 - replace the CHECK VALVE-FUEL PUMP, L WING TK OUTR (33QM) (Ref. AMM TASK 28-21-43-000-001) and (Ref. AMM TASK 28-21-43-400-001).

 (2) The FAULT indication of the P/BSW-FUEL/L TK PUMPS/2 (15QA) fails to momentarily show:

 - replace the CHECK VALVE-FUEL PUMP, L WING TK INR (34QM) (Ref. AMM TASK 28-21-43-000-001) and (Ref. AMM TASK 28-21-43-400-001).

 (3) The FAULT indication of the P/BSW-FUEL/R TK PUMPS/1 (14QA) fails to momentarily show:

 - replace the CHECK VALVE-FUEL PUMP, R WING TK INR (35QM) (Ref. AMM TASK 28-21-43-000-001) and (Ref. AMM TASK 28-21-43-400-001).

 (4) The FAULT indication of the P/BSW-FUEL/R TK PUMPS/2 (16QA) fails to momentarily show:

 - replace the CHECK VALVE-FUEL PUMP, R WING TK OUTR (36QM) (Ref. AMM TASK 28-21-43-000-001) and (Ref. AMM TASK 28-21-43-400-001).

 (5) Do the test given in Para. 3.A.

 **ON A/C 301-399,
 A. If during the test in Para. 3.A.(2):
 (1) The FAULT indication of the P/BSW-FUEL/L TK PUMPS/1 (13QA) fails to momentarily show:

 - replace the CHECK VALVE (224QM) (Ref. AMM TASK 28-16-42-000-002) and (Ref. AMM TASK 28-16-42-400-002).

 (2) The FAULT indication of the P/BSW-FUEL/L TK PUMPS/2 (15QA) fails to momentarily show:

 - replace the CHECK VALVE (222QM) (Ref. AMM TASK 28-16-42-000-002) and (Ref. AMM TASK 28-16-42-400-002).
 「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 ∞∞28-21-00∞∞∞∞∞∞∞∞∞∞Page B232
 Aug 01/05 CES

R  (3) The FAULT indication of the P/BSW-FUEL/R TK PUMPS/1 (14QA) fails to 
R  momentarily show: 
R  - replace the CHECK VALVE (223QM) (Ref. AMM TASK 28-16-42-000-002) 
R  and (Ref. AMM TASK 28-16-42-400-002). 
R  (4) The FAULT indication of the P/BSW-FUEL/R TK PUMPS/2 (16QA) fails to 
R  momentarily show: 
R  - replace the CHECK VALVE (225QM) (Ref. AMM TASK 28-16-42-000-002) 
R  and (Ref. AMM TASK 28-16-42-400-002). 
R  (5) Do the test given in Para. 3.A.

 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : 301-399, ∞∞28-21-00∞∞∞∞∞∞∞∞∞∞Page B233
 May 01/04 CES

R  **ON A/C ALL
 TASK 28-21-00-810-843
 No Transfer or Reduced Supply (Movement) of Fuel From a Main Fuel Pump but the Related Pump P/BSW FAULT Legend (light) Does Not Come On
 WARNING : OBEY THE FUEL SAFETY PROCEDURES._______
 1. Possible Causes_______________
R R R R  - fuel-pump canister check-valve - fuel pump canister - sequence valve - main-pump-system pipe-lines - suction valve - check valve (149QM) - check valve (151QM) - check valve (150QM) - check valve (152QM)
 2. Job Set-up Information______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE  DESIGNATION
 -------------------------------------------------------------------------------
R R R R  AMM AMM AMM AMM AMM AMM AMM AMM AMM AMM AMM AMM AMM AMM AMM AMM AMM  12-11-28-650-003 28-00-00-000-001 28-00-00-400-001 28-21-00-280-001 28-21-00-710-003 28-21-00-710-007 28-21-00-710-012 28-21-00-720-004 28-21-00-790-001 28-21-42-000-001 28-21-42-400-001 28-21-45-000-001 28-21-45-400-003 28-21-51-000-001 28-21-51-000-002 28-21-51-400-001 28-21-51-400-002  Pressure Refuel with Automatic ControlRemoval of the Fuel PipesInstallation of the Fuel PipesCheck Suction Valves For Full and Free Movement Operational Check of Center Tank Pump Canister Check ValvesOperational Test of the Main Fuel-Pump System with Fuel Flow by Transfer Operational Test of the Wing Tank Pump Canister Check ValvesFunctional Test of the Center-Tank Fuel-Pump-Cannister Check-ValvesLeak Test of the Main Fuel-Pump-System PipelinesRemoval of the Fuel-Pump Suction ValveInstallation of the Fuel-Pump Suction ValveRemoval of the Sequence ValveInstallation of the Sequence ValveRemoval of the Fuel Pumps 21QA(26QA) and 25QA(22QA)Removal of the Fuel Pumps 37QA(38QA)Installation of the Fuel Pumps 21QA(26QA) and 25QA(22QA)Installation of the Fuel Pumps 37QA(38QA)
　
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