Fuel Pumps - Center Tank Autofeed Failure (Pumps Do Not Stop At Wing-Tank(s) Innercell Full Level)

TASK 28-21-00-810-821-A
Fuel Pumps - Center Tank Autofeed Failure (Pumps Do Not Stop At Wing-Tank(s) Innercell Full Level)

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

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

RELAY-CTR TK AUTO CONTROL, PUMP 1(2) 41QA(42QA) 92VU

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 28-21-00-810-813-A	Fuel Pumps - Center Tank Fuel Pump No. 1 (Left Side) 37QA System Malfunction
TSM TASK 28-21-00-810-814-A	Fuel Pumps - Center Tank Fuel Pump No. 2 (Right Side) 38QA System Malfunction
TSM TASK 28-21-00-810-817-A	Fuel Pumps - Center Tank Fuel Pump No. 1 (Left Side) Contactor Control Failure (Manual Control)
TSM TASK 28-21-00-810-818-A	Fuel Pumps - Center Tank Fuel Pump No. 2 (Right Side) Contactor Control Failure (Manual Control)
AMM 28-21-00-720-001	Functional Test of the Center-Tank Fuel Control

3. Fault Confirmation
Subtask 28-21-00-710-070-B ** ON A/C NOT FOR ALL

A. Test
(1) Do the Functional Test of the Center-Tank Fuel Control (in manual and auto control modes) AMM 28-21-00-720-001.

4. Fault Isolation
Subtask 28-21-00-810-070-F ** ON A/C NOT FOR ALL

A. Procedure
(1) If the:
(a) Center-Tank Fuel Pumps No 1 do not operate correctly in the Manual Mode do:
1 Fuel Pumps - Center Tank Pump-Fuel No 1 System Failure (Ref. TSM TASK 28-21-00-810-813).
2 Fuel Pumps - Center Tank Pump-Fuel No 1 Contactor Control Failure (Ref. TSM TASK 28-21-00-810-817).
(b) Center-Tank Fuel Pumps No 2 do not operate correctly in the Manual Mode do:
1 Fuel Pumps - Center Tank Pump-Fuel No 2 System Failure (Ref. TSM TASK 28-21-00-810-814).
2 Fuel Pumps - Center Tank Pump-Fuel No 2 Contactor Control Failure (Ref. TSM TASK 28-21-00-810-818).
(2) If a pump does not stop during the test given in Para. 3.A., Auto Mode:

examine the ECAM FUEL System Display page to see which side(s) has/have not shut off correctly.

NOTE: The CTR TANK PUMP INDICATIONS are:

In line - Green - Pump pressure normal (pump contactor on)
LO - Amber - Pump low pressure (pump contactor on)
Cross line - Green - Pump contactor off and auto shut off required
Cross line - Amber - Pump contactor off and auto shut off not required.

NOTE: For the ECAM warning/caution - AUTO FEED FAULT to have been given by the FWC, a CTR TK PUMP 1 or 2 AUTO SHUT OFF REQUIRED signal has been received.
This shows that:

the FLSCU-1(2) input of CTR TK PUMP RECIRCULATION CTL off (a ground) has operated correctly
the RELAY 51QA(52QA) has operated correctly (remained de-energized)
the RELAY 41QA(42QA), contacts C to 6 (the source of the AUTO SHUT OFF REQUIRED signal) have operated correctly (energized).

(3) If the fault continues:
(a) Do a check of the RELAY-CTR TK AUTO CONTROL, PUMP 1(2) 41QA(42QA) 92VU (contacts B to 3) and replace, if necessary.
(b) Do the test given in Para. 3.A.

[Rev.8 from Aug 2018] 2026.04.04 04:28:36 UTC