Fuel Pumps - Center Tank Fuel Pump No. 2 (Right Side) 38QA System Malfunction

TASK 28-21-00-810-814-A
Fuel Pumps - Center Tank Fuel Pump No. 2 (Right Side) 38QA System Malfunction

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

WARNING: DO NOT CLOSE OR RESET:

AN OPEN (TRIPPED) MECHANICAL CIRCUIT BREAKER
A TRIPPED GFI

THAT IS RELATED TO A FUEL PUMP. YOU MUST DO THE TROUBLESHOOTING OF THE FAULT BEFORE YOU CLOSE OR RESET AN OPEN CIRCUIT BREAKER OR GFI. IF YOU CLOSE THE CIRCUIT BREAKER, THERE IS A RISK OF:

FIRE OR EXPLOSION
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: EN50020, UL913 OR EQUIVALENT). TEST EQUIPMENT THAT IS NOT APPROVED CAN CAUSE FIRE OR AN EXPLOSION.

1. Possible Causes

C/B-FUEL/CTR TK/PUMP2 SPLY [30QA]
CNTOR-GFI CTR TK PUMP 2 SUPPLY [70QA]
PUMP-FUEL NO 2, CTR TK [38QA]
aircraft wiring
PRESS SW-FUEL PUMP NO 2, CTR TK [40QA]
pressure switch safety valve
pressure switch plug (banjo adaptor attachment bolt)
pressure switch fuel supply pipe-line between the fuel pump canister 85QM and the pressure switch 40QA

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	MEGOHMMETER 200 MOHMS - 500 VDC, 0.001 A MAX
No specific	1	MULTIMETER - STANDARD
99A28404000000	1	ADAPTOR-SEQUENCE VALVE

B. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 28-21-00-810-829-A	Fuel - Loss of Power supply to the Center Tank Pump 1(2)
ESPM 203136
ESPM 2031360
ESPM 2052210
ESPM 2052240
ASM 245806
AMM 28-18-00-710-801	Operational Check of Center-Tank Fuel-Pump GFI
AMM 28-21-00-040-002	Deactivation of the Center Tank
AMM 28-21-00-710-007	Operational Test of the Main Fuel-Pump System with Fuel Flow by Transfer
AMM 28-21-00-720-001	Functional Test of the Center-Tank Fuel Control
ASM 282103
AWM 282106
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
AMM 28-21-51-400-002	Installation of the Fuel Pumps
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
SRM 530000
AWM 930107
AWM 930120
AWM 930121

3. Fault Confirmation
Subtask 28-21-00-865-057-A ** ON A/C NOT FOR ALL

A. Table of the circuit breakers referred to in this procedure:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	FUEL/CTR TK/PUMP2 SPLY	30QA	P26

Subtask 28-21-00-710-062-C ** ON A/C NOT FOR ALL

B. Test

WARNING: DO NOT CLOSE OR RESET:

AN OPEN (TRIPPED) MECHANICAL CIRCUIT BREAKER
A TRIPPED GFI

THAT IS RELATED TO A FUEL PUMP. YOU MUST DO THE TROUBLESHOOTING OF THE FAULT BEFORE YOU CLOSE OR RESET AN OPEN CIRCUIT BREAKER OR GFI. IF YOU CLOSE THE CIRCUIT BREAKER, THERE IS A RISK OF:

FIRE OR EXPLOSION
DAMAGE TO THE AIRCRAFT WIRING AND STRUCTURE.

(1) Examine the C/B-FUEL/CTR TK/PUMP2 SPLY [30QA] and the CNTOR-GFI CTR TK PUMP 2 SUPPLY [70QA] .
(2) If the C/B-30QA or the GFI-70QA are open (tripped), do the Fuel - Loss of Power supply to the Center Tank Pump 1(2) procedure (Ref. TSM TASK 28-21-00-810-829).
(3) If the C/B-30QA and the GFI-70QA are closed, do the functional test of the Center-Tank Fuel Control (Manual Mode) AMM 28-21-00-720-001.

4. Fault Isolation
Subtask 28-21-00-810-062-C ** ON A/C NOT FOR ALL

A. Procedure
(1) Do the operational test of the GFI 70QA AMM 28-18-00-710-801.
(a) If there is a fault with the CNTOR-GFI CTR TK PUMP 2 SUPPLY [70QA] , replace it.

or
(b) If MMEL conditions apply, deactivate the PUMP-FUEL NO 2, CTR TK [38QA] AMM 28-21-00-040-002. (Ref. MMEL 28-21-02 Center Tank Fuel Pump).
(2) If a fuel low pressure indication is shown for the center tank fuel pump No. 2 (38QA):

do a fuel transfer, AMM 28-21-00-710-007 use the center tank fuel pump No. 2 to do the fuel transfer.

(3) If the fuel starts to transfer go to step (4). If the fuel does not start to transfer:
(a) Set the CTR TK PUMP 2 P/BSW (34QA) to OFF (release out). This will de-energize the CNTOR-GFI CTR TK PUMP 2 SUPPLY [70QA] .
(b) Open the right main landing gear door for access AMM 32-12-00-010-001.
(c) Get access to the center tank fuel pump No. 2, 38QA AMM 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 148 and 196) that follow:

the center tank bottom skin adjacent to the right fuel pump 38QA
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 right 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:

b Clean the area of the fuel spillage.
c Clean and dry the fuel pump supply cable and the end connector 38QA-A.
(e) Disconnect the supply cable end connector 38QA-A from the fuel pump receptacle.
1 Make sure that good lighting is available.
Do a visual inspection and look for distortion (pinched or streched) damage (chafed or cut), discoloration, overheating (burnt/melted or arcing) liquid contamination, loose electrical connection or incorrect assembly, of the items that follow:

the fuel pump receptacle
the fuel pump supply cable end connector 38QA-A
the fuel pump supply cable
the forward and rear sides of the structure of bulkhead FR42 adjacent to the route of the supply cable.

2 Repair, replace or make serviceable items found unserviceable in step (e)1_.
a If a wire is damaged, the complete section (length) of (each) wire (between the fuel pump connector 38QA-A and the connector 7577VC-A that goes through pressure seal 7508VP) must be replaced AWM 282106.
This is because the wires are located in a fuel and vapour zone ESPM 2031360.
3 If the aircraft structure is damaged, refer to Allowable Damage, P. Block 101, SRM 530000 for the related type of damage in the Table of Contents.
(f) Set the CTR TK PUMP 2 P/BSW (34QA) to ON (push in). This will energize the CNTOR-GFI CTR TK PUMP 2 SUPPLY [70QA] and the 115VAC three phases will be supplied to the fuel pump connector 38QA-A.
(g) Do a test with a MULTIMETER - STANDARD to make sure that each of the 115VAC three phases are available at the connector 38QA-A ASM 282103.
(h) Set the CTR TK PUMP 2 P/BSW (34QA) to OFF (release out). This will de-energize the GFI 70QA.
1 On the FUEL page of the ECAM System Display, do a check of the center-tank-pump 2 symbol:

If the center-tank-pump 2 symbol is not green, go to step (i).
If the center-tank-pump 2 symbol is green, do the steps that follow:

2 Use a MULTIMETER - STANDARD to make sure that each of the 115VAC three phases are not available at the connector 38QA-A.

NOTE: This is to make sure that the GFI 70QA does not stay in the on position.

3 If necessary, replace the CNTOR-GFI CTR TK PUMP 2 SUPPLY [70QA] .
(i) If the 115VAC three phase supply voltage measured in step (g) is correct, replace the PUMP-FUEL NO 2, CTR TK [38QA] AMM 28-21-51-000-002 and AMM 28-21-51-400-002.
(j) If the 115VAC three phase supply voltage measured in step (g) is not correct, (no voltage, incorrect voltage or a phase is missing) do all the sub-steps that follow:
1 In the cockpit (right rear) do a visual inspection as specified in step (e)1_ of the items that follow, replace if necessary:
a The C/B-FUEL/CTR TK/PUMP2 SPLY [30QA] at the C/B panel 121VU AWM 930121.
b The connector 2204VC-A and related receptacle at the panel 120VU AWM 930120.
2 Release the front face of the C/B panel 121VU and lower to the open (horizontal) position.
3 Make sure that the C/B-30QA is closed. Use a MULTIMETER - STANDARD and make sure that the 115VAC three phases are available at the C/B-30QA input and output terminals ASM 282103.
4 If the 115VAC supply to the C/B-30QA, is not available at terminals A1, B1 and C1 trouble shoot the AC supply ASM 245806.
5 If, with the C/B-30QA closed, the 115VAC supply is not available at terminals A2, B2 and C2, replace the C/B-FUEL/CTR TK/PUMP2 SPLY [30QA] .
6 Raise the front face of the C/B panel 121VU to the closed (vertical) position and secure.
7 In the forward avionics bay, remove the front cover of the contactor box 107VU AWM 930107.
8 Do a visual inspection as specified in step (e)1_ and replace, if necessary:
a Make sure that the CNTOR-GFI CTR TK PUMP 2 SUPPLY [70QA] is in the untripped reset condition.
b The connectors 1262VC-A and 1266VC-A and the related receptacles.
9 If the fault has been identified, remove the CNTOR-GFI CTR TK PUMP 2 SUPPLY [70QA] .
10 Use a multimeter and make sure that each of the 115VAC three phases are available at the GFI base input sockets (A1, B1 and C1) ASM 282103.
11 If the 115VAC is available, replace the CNTOR-GFI CTR TK PUMP 2 SUPPLY [70QA] with a serviceable item.
a Do the operational test of the GFI 70QA AMM 28-18-00-710-801.
b Go to step 13_.

CAUTION: YOU MUST DISCONNECT THE GFI FROM THE AIRCRAFT INSTALLATION BEFORE YOU DO THE INSULATION RESISTANCE TESTS. IF THE GFI IS NOT DISCONNECTED, DAMAGE WILL OCCUR TO THE GFI.

12 If the 115VAC supply to the CNTOR-GFI CTR TK PUMP 2 SUPPLY [70QA] is not available, do a test of the aircraft wiring (three phase supply) between the C/B-FUEL/CTR TK/PUMP2 SPLY [30QA] and the CNTOR-GFI CTR TK PUMP 2 SUPPLY [70QA] ASM 282103.
Do the test as follows:
a Continuity test, with an MULTIMETER - STANDARD of each three phase wire (from end to end) ESPM 2052210.
b Insulation test, with an intrinsically safe 500VDC insulation tester, between each phase wire (pole) and ground ESPM 2052240.
c Insulation test, with an intrinsically safe 500VDC insulation tester, between each phase wire and the other two wires (pole to pole) ESPM 2052240.
d Repair, replace the unserviceable wiring and connectors.

CAUTION: DO NOT USE IN-LINE SPLICES TO REPAIR SECTIONS OF ELECTRICAL CABLE THAT ARE BEHIND A FAIRING OR IN A CONDUIT. THIS WILL MAKE SURE THAT IT IS POSSIBLE TO SEE THE REPAIR FOR AN INSPECTION (REF. ESPM 20-53-29).

e Install the CNTOR-GFI CTR TK PUMP 2 SUPPLY [70QA] and make sure it is in the untripped reset position.
f Install the front cover of the contactor box 107VU.
13 Set the CTR TK PUMP 2 P/BSW (34QA) to ON (push in). This will energize the CNTOR-GFI CTR TK PUMP 2 SUPPLY [70QA] and the 115VAC three phases will be supplied to the fuel pump connector 38QA-A ASM 282103.
14 Use an MULTIMETER - STANDARD to do a test, to make sure that each of the 115VAC three phases are available at the connector 38QA-A ASM 282103.
15 Set the CTR TK PUMP 2 P/BSW (34QA) to OFF (release out). This will de-energize the CNTOR-GFI CTR TK PUMP 2 SUPPLY [70QA] .
16 If in step 13_ the 115VAC is available at the connector 38QA:
a Install the front cover of the contactor box 107VU.
b Connect the connector 38QA-A to the fuel pump receptacle.
c Do the Functional Test of the Center Tank Fuel Control (Manual Mode) AMM 28-21-00-720-001.
17 If the 115VAC is not available at the connector 38QA, do a test of the aircraft wiring (three phase supply) between the CNTOR-GFI CTR TK PUMP 2 SUPPLY [70QA] and the PUMP-FUEL No 2, CTR TK (38QA) connector 38QA-A AWM 282106.

NOTE: The aircraft wiring is divided into two sections (lengths) by the connector 7577VC. The section of the power supply cable between 7577VC-A and the fuel pump connector 38QA-A is located in a fuel and vapour zone ESPM 2031360.

Do the test as follows:
a Continuity test, with an (intrinsically safe) multimeter, of each three phase wire (from end to end) ESPM 2052210.
b Insulation test, with a MEGOHMMETER 200 MOHMS - 500 VDC, 0.001 A MAX, between each phase wire (pole) and ground ESPM 2052240.
c Insulation test, with an (intrinsically safe) 500VDC insulation tester, between each phase wire and the other two wires (pole to pole) ESPM 2052240.
d Repair or replace the unserviceable wiring and connectors.
If a wire (between the connector 7577VC-A and the fuel pump connector 38QA-A, that goes through the pressure seal (bung) 7508VP) is found to be damaged, the complete section (length) of (each) wire must be replaced. This is because the wires are located in a fuel and vapour zone ESPM 203136.
e Install the front cover of the contactor box 107VU.
f Connect the fuel pump supply cable end connector 38QA-A to the fuel pump receptacle.
g Do the Functional Test of the Center Tank Fuel Control (Manual Mode) AMM 28-21-00-720-001.
(4) If the fuel transfers:
(a) Set the CTR TK PUMP 2 P/BSW (34QA) to OFF (release out). This will de-energize the CNTOR-GFI CTR TK PUMP 2 SUPPLY [70QA] and remove the 28VDC from the pressure switch.
(b) Open the right main landing gear door for access AMM 32-12-00-010-001.
(c) Get access to center tank fuel pump No. 2, pressure switch 40QA AMM 28-21-15-000-003.
(d) Disconnect the free connector 40QA-A from the PRESS SW-FUEL PUMP NO 2, CTR TK (40QA).
(e) Set the CTR TK PUMP 2 P/BSW (34QA) to ON (push in). This will energize the CNTOR-GFI CTR TK PUMP 2 SUPPLY [70QA] .
(f) See if the P/BSW (34QA) FAULT legend is on or off (with the pressure switch disconnected and the P/BSW pushed (in)).
(g) Set the CTR TK PUMP 2 P/BSW (34QA) to OFF (release out). This will de-energize the CNTOR-GFI CTR TK PUMP 2 SUPPLY [70QA] .
(h) If in step (f) the P/BSW-FUEL/CTR TK/PUMP 2 (34QA) FAULT legend stays on go to step (l).
(i) If in step (f) the P/BSW-FUEL/CTR TK/PUMP 2 (34QA) FAULT legend goes off:

do a check of, and replace if necessary, the PRESS SW-FUEL PUMP NO 2, CTR TK [40QA] AMM 28-21-15-000-003 and AMM 28-21-15-400-001.

NOTE: The fuel-pump fuel pressure can be measured at the safety valve outlet using an 99A28404000000 ADAPTOR-SEQUENCE VALVE. This can be installed in place of the pressure switch 40QA AMM 28-21-45-400-003.

(j) If the fault continues, or if no fuel pressure is shown on the gage of the ADAPTOR - SEQUENCE VALVE, make sure that these components are in the correct condition:

the pressure switch safety valve
the pressure switch plug (banjo adaptor attachment bolt)
the pressure switch fuel supply pipe-line between the fuel pump canister 85QM and the pressure switch 40QA .

NOTE: The first section of the fuel supply pipe-line to the pressure switch 40QA is also the primary supply to the center tank (right side) water scavenge jet pump 90QM.

1 Repair/replace the components that are unserviceable.
(k) Do the Functional Test of the Center Tank Fuel Control (Manual Mode) AMM 28-21-00-720-001.
(l) If the P/BSW-FUEL/CTR TK/PUMP 2 (34QA) FAULT legend stays on, do a check of the aircraft wiring (low pressure lines) ASM 282103 between the:

pressure switch connector 40QA-A, pin C and the relay-42QA, terminal 1
pressure switch connector 40QA-A, pin C and the FLSCU-2 rack connector 9QJ-AA, terminal 12C
pressure switch connector 40QA-A, pin C and the SDAC-1 rack connector 1WV1-AD, terminal 13D
pressure switch connector 40QA-A, pin C and the SDAC-2 rack connector 1WV2-AD, terminal 13D
relay-42QA, terminal A and the relay-50QA, terminal 1
relay-50QA, terminal A and the BOARD-ANN LT TEST & INTFC connector 2LP-A, terminal 14
BOARD-ANN LT TEST & INTFC connector 2LP-A, terminal 13 and the P/BSW-FUEL/CTR TK/PUMP 2 connector 34QA-A, terminal 7.

NOTE: A short circuit to ground on one of these lines will cause:

a false LO PR warning to be generated within the FWC
the FAULT legend/lamp to come on incorrectly.

It is possible that a short circuit to ground on the above lines can come from one of the LRUs as follows:

BOARD-ANN LT TEST & INTFC (2LP)
FLSCU-2 (9QJ)
SDAC-1 (1WV1)/SDAC-2 (1WV2)
RELAY-CTR TK AUTO CONTROL, PUMP 2 (42QA)
RELAY-CTR TK FAULT INHIBIT, PUMP 2 (50QA)
P/BSW FUEL PUMP 2 (34QA).

(m) Repair the unserviceable wiring and connectors.
(n) Do the Functional Test of the Center Tank Fuel Control (Manual Mode) AMM 28-21-00-720-001.

[Rev.8 from Aug 2018] 2026.04.04 04:28:35 UTC