(a) Do a check of the electrical circuits (Ref. ASM 28-21/02) as follows:
 1 At the panel (contactor box) 107VU, remove the contactor-20QA.
_
 2 At the contactor (relay) base 20QA-A, make sure that:

_

 - a ground is available at terminal Z

 - 28VDC is available at terminal X, when the P/BSW-16QA is set to on (through the closed contacts B3 to B1).

 3 Replace all the unserviceable items.
_ 4 Make sure that the contactor-20QA removed in step 1_ is
_
 installed.

 5 Do the test given in Para. 3.A.
_

 (b) Swap (interchange) the items listed that follow, one at a time, with those from the left wing-tank fuel-pump 2 system:
 - the CNTOR-R WING TK PUMP 2 SPLY (20QA)

 - the P/BSW-FUEL/R TK PUMPS/2 (16QA).

 「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 A227
 May 01/04R CES

 1 Do the test given in Para. 3.A.
_

 2 If the fault is removed/cleared:
_ a Replace all the unserviceable items.

_

 b Do the test given in Para. 3.A. for the left and right
_
 wing-tank fuel-pumps 2.

 (2) If the fault continues:
 (a) Do a check (Ref. ASM 28-21/02) of the aircraft wiring between:

 - the C/B-FUEL/PUMPS/2/R CTL AND L IND (10QA), terminal 2 and the P/BSW-FUEL/R TK PUMP/2 (16QA), terminal B3

 - the P/BSW-FUEL/R TK PUMP/2 (16QA), terminal B1 and the CNTOR-R WING TANK PUMP 2 SPLY (20QA), terminal X

 - the CNTOR-R WING TK PUMP 2 SPLY (20QA), terminal Z and the aircraft ground DC2 at 1175VT.

 (b) Repair all the unserviceable wiring and connectors (Ref. ESPM 20-00-00).

 (c) 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 A228
 May 01/04R
 CES R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,

 TASK 28-21-00-810-813
 Fuel Pumps - Center Tank Fuel Pump No. 1 (Left Side) 37QA System Malfunction
 WARNING : OBEY THE FUEL SAFETY PROCEDURES.
_______
 WARNING : DO NOT CLOSE AN OPEN (TRIPPED) CIRCUIT BREAKER RELATED TO A
_______
 FUEL-PUMP.
 IF YOU CLOSE THE CIRCUIT BREAKER, THERE IS A RISK:

 - OF FIRE OR OF AN EXPLOSION

 - OF DAMAGE TO THE AIRCRAFT WIRING AND STRUCTURE.

 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
_______________
 - PUMP-FUEL NO 1, CTR TK (37QA)

 - CNTOR-CTR TK PUMP 1 SPLY (35QA)

 - PRESS SW-FUEL PUMP NO 1, CTR TK (39QA)

 - C/B-FUEL/CTR TK/PUMP1 SPLY (29QA)

 - aircraft wiring

 - pressure switch safety valve

 - pressure switch plug (banjo adaptor attachment bolt)

 - pressure switch fuel supply pipe-line between the fuel pump canister 84QM and the pressure switch 39QA

 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific (intrinsically safe) multimeter
 No specific (intrinsically safe) 500VDC insulation tester
 99A28404000000 1 ADAPTOR - SEQUENCE VALVE

 「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, ∞∞28-21-00∞∞∞∞∞∞∞∞∞∞Page A229
 201-299, 401-499, Aug 01/05 CES

 B. Referenced Information

 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
28-21-00-810-829 Fuel - Center Tank Pump 1(2), Power Supply -
C/B-29QA(30QA) Tripped

 ASRM 53-00-00
 AWM 93-01-07
 AWM 93-01-20
 AWM 93-01-21
 ESPM 20-31-36
 ESPM 20-52-21
 ESPM 20-52-24
　
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