(5) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

 「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 A204
 May 01/05 CES

 **ON A/C ALL

 TASK 28-21-00-810-805
 Fuel Pumps - Left Wing Tank Fuel Pump No. 1 System Failure (Standby Supply)
 WARNING : OBEY THE FUEL SAFETY PROCEDURES._______ 
R R R R R  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_______________
 - L WING TK/PUMP 1/STBY SPLY (11QA) - CT-AC, 1 (42XU3) - CNTOR-L WING TK STBY SPLY, PUMP 1 (53QA) - aircraft wiring (three phase electrical standby supply)
 2. Job Set-up Information______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific  multimeter
 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------

28-21-00-810-801
28-21-00-810-807

AMM  24-22-00-710-001 
AMM  24-22-17-000-001 
AMM  24-22-17-400-001 
ASM  24-22/02
 ASM  28-21/01

Fuel Pumps - Left Wing Tank Fuel Pump No. 1 (Outer)
 21QA System Malfunction
Fuel Pumps - Left Wing Tank Fuel Pump No. 1 Contactor
 Control Failure (Normal Supply)
Operational Test of the Generator Line Contactor
 (GLC-1) Opening in the Smoke Procedure
Removal of the AC Current Transformers (41XU1, 41XU2,
 42XU1, 42XU2, 42XU3 and 42XU4)
Installation of the AC Current Transformers (41XU1,
 41XU2, 42XU1, 42XU2, 42XU3 and 42XU4)

 「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 A205
 May 01/04 CES

 3. Fault Confirmation
__________________
 A. Test
 (1) Do the Operational Test of the Generator Line Contactor (GLC-1) Opening in the Smoke Procedure (Ref. AMM TASK 24-22-00-710-001).

 (2) If a low fuel pressure indiction is shown when the left wing tank fuel pump No. 1 is supplied from:

 (a) The normal supply (AC BUS 1 and through the contactor-17QA), do (Ref. TASK 28-21-00-810-801) and (Ref. TASK 28-21-00-810-807).

 (b) The standby supply (direct from the Generator No. 1 and through the contactor-53QA), do Para. 4.A.

 4. Fault Isolation
_______________
 A. Procedure
 (1) Do a check of (Ref. ASM 28-21/01) and replace, if necessary:

 - the C/B-L WING TK/PUMP 1/STBY SPLY (11QA)

 - the CT-AC, 1 (42XU3) (Ref. AMM TASK 24-22-17-000-001) and (Ref. AMM TASK 24-22-17-400-001)

 - the CNTOR-L WING TK STBY SPLY, PUMP 1 (53QA).

 (2) Do a check, with a multimeter, of the aircraft wiring (three phase electrical standby supply) (Ref. ASM 24-22/02) and (Ref. ASM 28-21/01) between:

 - the contactor GLC-1 (9XU1) (Gen 1 connected terminals D, E and F) and the C/B-L WING TK/PUMP 1/STBY SPLY (11QA)
 NOTE : Each phase of the wiring between these two units goes through
____ a different toroidal transformer of the CT-AC, 1 (42XU3). There is no direct electrical connection.
 - the C/B-L WING TK/PUMP 1/STBY SPLY (11QA) and the CNTOR-L WING TK STBY SPLY, PUMP 1 (53QA)

 - CNTOR-L WING TK STBY SPLY, PUMP 1 (53QA) and the PUMP-FUEL No. 1, L WING TK free connector 21QA-A.

 (3) Repair the unserviceable wiring and connectors.

 (4) 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 : ALL ∞∞28-21-00∞∞∞∞∞∞∞∞∞∞Page A206
 May 01/04R
 CES

 TASK 28-21-00-810-806
 Fuel Pumps - Right Wing Tank Fuel Pump No. 1 System Failure (Standby Supply)
 WARNING : OBEY THE FUEL SAFETY PROCEDURES._______ 
　
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