Fuel Pumps - Right Wing Tank Fuel Pump No. 2 Contactor Control Failure

TASK 28-21-00-810-812-A
Fuel Pumps - Right Wing Tank Fuel Pump No. 2 Contactor Control Failure

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

1. Possible Causes

CNTOR-R WING TK PUMP 2 SPLY [20QA]
P/BSW-FUEL/R TK PUMPS/2 [16QA]
aircraft wiring

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

REFERENCE	QTY	DESIGNATION
No specific	AR	MULTIMETER - STANDARD

B. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 28-21-00-810-804-A	Fuel Pumps - Right Wing Tank Fuel Pump No. 2 (Outer) 26QA System Malfunction
TSM TASK 28-21-00-810-828-A	Fuel - L(R) Wing Tank Pumps 2, Power Supply - C/B-7QA(8QA) Tripped
ESPM 2053210
AMM 28-21-00-710-001	Operational Test of the Wing-Tank Fuel Control
ASM 282102

3. Fault Confirmation
Subtask 28-21-00-710-099-A

A. Safety Precaution

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) If you find the C/B-8QA has tripped (during a work step in this TSM TASK or a referenced out AMM TASK), you must:
(a) Stop the initial work steps.
(b) Do the TSM procedure, Fuel - L(R) Wing Tank Pumps 2, Power Supply - C/B-7QA(8QA) Tripped (Ref. TSM TASK 28-21-00-810-828).
(c) Replace (or do a repair of) all the unserviceable wiring and connections ESPM 2053210 before you continue.
(d) Close the C/B-8QA.
(e) Continue the initial work steps.

Subtask 28-21-00-710-061-A

B. Test
(1) If necessary, do the job set-up of the Operational Test of the Wing-Tanks Fuel Control AMM 28-21-00-710-001.
(2) Push (in) the R TK PUMPS 2 P/BSW (16QA).
(3) Examine the right wing-tank fuel-pump 2 symbol, on the FUEL system page, at the ECAM lower display unit.
(4) If the symbol shows:

green in-line, no more maintenance steps are necessary (normal operation)
amber cross-line, do Para. 4.A.
amber LO, do the TSM procedure Right Wing Tank Pump No. 2 (Outer) 26QA System Malfunction (Ref. TSM TASK 28-21-00-810-804).

NOTE: The amber LO is only shown when the signals that follow occur at the same time:

the contactor closed (on)

and

the right tank pump 2 low fuel pressure.

4. Fault Isolation
Subtask 28-21-00-810-061-A

A. Procedure
(1) Do the initial checks as given in:

step (a), with a MULTIMETER - STANDARD

and/or

step (b), by substitution and replacement.

(a) Do a check of the electrical circuits ASM 282102 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.B.
(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] .

1 Do the test given in Para. 3.B.
2 If the fault is removed/cleared:
a Replace all the unserviceable items.
b Do the test given in Para. 3.B. for the left and right wing-tank fuel-pumps 2.
(2) If the fault continues:
(a) Do a check ASM 282102 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 ESPM 2053210.
(c) Do the test given in Para. 3.B.

[Rev.8 from Aug 2018] 2026.04.04 04:28:34 UTC