AMM 28-21-00-720-001 Functional Test of the Center-Tank Fuel Control
 AMM 28-21-15-000-003 Removal of the Fuel-Pump Pressure-Switch.
 AMM 28-21-15-400-001 Installation of the Fuel-Pump Pressure-Switch.
 AMM 28-21-45-400-003 Installation of the Sequence Valve
 AMM 28-21-51-000-002 Removal of the Fuel Pumps 37QA(38QA)
 AMM 28-21-51-400-002 Installation of the Fuel Pumps 37QA(38QA)
 AMM 32-12-00-010-001 Open the Main Gear Doors for Access
 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
 ASM 28-21/03
 TSM 24 PB 101
 AWM 28-21-05
 3. Fault Confirmation
__________________
 A. Table of the circuit breakers referred to in this procedure:
 -------------------------------------------------------------------------------
PANEL DESIGNATION IDENT. LOCATION
 -------------------------------------------------------------------------------
121VU FUEL/CTR TK/PUMP1 SPLY 29QA P23
 B. Test
 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.

 (1) Examine the C/B-FUEL/CTR TK/PUMP1 SPLY (29QA).
 「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 A230
 201-299, 401-499, Aug 01/05 CES (2) If the C/B-29QA:

 (a) Is open (tripped), do Fuel - Center Tank Pumps 1(2), Power Supply

 - C/B-29QA(30QA) Tripped (Ref. TASK 28-21-00-810-829).

 (b) Is closed (set), do the Functional Test of the Center-Tank Fuel Control (Manual Mode) (Ref. AMM TASK 28-21-00-720-001).

 4. Fault Isolation
_______________
 A. Procedure
 (1) If a fuel low pressure indication is shown for the center tank fuel pump No. 1 (37QA):

 - do a fuel transfer, (Ref. AMM TASK 28-21-00-710-007) use the center tank fuel pump No. 1 to do the fuel transfer.

 (2) If the fuel starts to transfer go to step (3). If the fuel does not start to transfer:

 (a) Set the CTR TK PUMP 1 P/BSW (33QA) to OFF (release out). This will de-energize the contactor 35QA.

 (b) Open the left main landing gear door for access (Ref. AMM TASK 32-12-00-010-001).

 (c) Get access to the center tank fuel pump No. 1, 37QA (Ref. AMM TASK 28-21-51-000-002).

 (d) Before you do more steps make sure that fuel from a leak or spillage does not contaminate the areas (in zones 147 and 195) that follow:

 - the center tank bottom skin adjacent to the left fuel pump 37QA

 - the hydraulic compartment below the wing box (center tank) and forward side of the rear bulkhead at FR42

 - the rear wall (spar) of the center tank in the left main landing gear bay

 - the rear side of the bulkhead at FR 42 below the center tank.

 1 If necessary:
_ a Repair all the leaks:

_

 - (Ref. AMM TASK 51-76-12-300-001)

 - (Ref. AMM TASK 51-76-12-300-002).

 b Clean the area of the fuel spillage.
_

 c Clean and dry the fuel pump supply cable and the end
_
 connector 37QA-A.

 (e) Disconnect the supply cable end connector 37QA-A from the fuel pump receptacle.
 「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 A231
 201-299, 401-499, Aug 01/05 CES

 (f) If, in step (d) or (e), any damage can be seen in this area, go to step (k) 1_.

 (g) Set the CTR TK PUMP 1 P/BSW (33QA) to ON (push in). This will energize the contactor 35QA and the 115VAC three phases will be supplied to the fuel pump connector 37QA-A.

 (h) Do a test with an (intrinsically safe) multimeter to make sure that each of the 115VAC three phases are available at the connector 37QA-A (Ref. ASM 28-21/03).

 (i) Set the CTR TK PUMP 1 P/BSW (33QA) to OFF (release out). This will de-energize the contactor 35QA.

 1 Use an (intrinsically safe) multimeter to do a test, to make
_ sure that each of the 115VAC three phases are not available at the connector 37QA-A.
 NOTE : This is to make sure that the contactor 35QA does not
　
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