Functional Test of the Center-Tank Fuel-Pump-Cannister Check-Valves

TASK 28-21-00-720-004-A
Functional Test of the Center-Tank Fuel-Pump-Cannister Check-Valves

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

1. Reason for the Job
Self Explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	CONTAINER 1 L (1/4 USGAL)
No specific	AR	SAFETY BARRIER(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.01ABA1)	Turbine Fuel-- Kerosene -
(Material No.03FAB1)	Mineral Oil base Grease-- Vaseline or Petrolatum -
(Material No.14QFB1)	Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
1	SEALING RING	AIPC 28-21-51-01-100

D. Referenced Information

REFERENCE	DESIGNATION
TASK 12-11-28-650-003-A	Pressure Refuel with Automatic Control
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 28-00-00-910-001-A	Fuel Safety Procedures
TASK 28-25-00-650-001-A	Pressure Defuel
TASK 28-25-00-650-003-A	To Drain Remaining Fuel from the Wing Tanks and the Center Tank
TASK 28-25-00-650-003-A-01	To Drain Remaining Fuel from the Wing Tanks and the Center Tank
TASK 28-25-00-869-001-A	Fuel Transfer
Center-Tank Fuel-Pump Drain Plug - Location and Detail

3. Job Set-up
Subtask 28-21-00-941-078-A ** ON A/C NOT FOR ALL

A. Safety Precautions

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

(1) You must obey the fuel safety procedures when you do work on the fuel system (Ref. AMM TASK 28-00-00-910-001).
(2) Put the SAFETY BARRIER(S) in position.

Subtask 28-21-00-860-084-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration

WARNING: MAKE SURE THAT ALL THE CIRCUITS IN MAINTENANCE ARE ISOLATED BEFORE YOU SUPPLY ELECTRICAL POWER TO THE AIRCRAFT. UNWANTED ELECTRICAL POWER CAN BE DANGEROUS.

(1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(2) Refuel (Ref. AMM TASK 12-11-28-650-003), defuel (Ref. AMM TASK 28-25-00-650-001) or transfer fuel (Ref. AMM TASK 28-25-00-869-001) as necessary so that:

the center tank is empty
the left wing tank inner-cell contains a minimum of 750 kg (1653 lb) of fuel.

(3) Drain the remaining fuel from the center tank (Ref. AMM TASK 28-25-00-650-003).

4. Procedure

WARNING: WHEN YOU OPERATE THE FUEL PUMPS DURING A MAINTENANCE PROCEDURE, A MAINTENANCE PERSON MUST BE IN THE COCKPIT. THIS PERSON MUST STOP THE PUMPS WHEN THE LOW PRESSURE FAULT LIGHT(S) (ON PANEL 40VU) COME ON, TO PREVENT OPERATION OF THE PUMPS(S) WITHOUT FUEL ('DRY RUNNING'). OPERATION OF THE PUMPS WITHOUT FUEL CAN CAUSE A FIRE.

Subtask 28-21-00-720-063-A ** ON A/C NOT FOR ALL

A. Functional Test of the Center-Tank Pump-Canister Check-Valves

NOTE: This test is for 84QM. For 85QM use the indications in parenthesis.

(1) Put a CONTAINER 1 L (1/4 USGAL) below the center tank fuel-pump 37QA(38QA).
(2) Remove the drain plug (2) from the center tank fuel-pump 37QA(38QA). Let the fuel drain from the center tank fuel pump 37QA(38QA).
(3) Install the drain plug (2) in the center tank fuel-pump 37QA(38QA).
(4) Remove the container from below the center tank fuel-pump 37QA(38QA).
(5) On the panel 40VU, push in the L (R) TK PUMPS 1 and 2 push button switches (P/BSWs).
(6) Let the wing tank pumps operate for 5 minutes.
(7) On the panel 40VU, release out the L (R) TK PUMPS 1 and 2 P/BSWs.
(8) Put an empty CONTAINER 1 L (1/4 USGAL) below the center tank fuel-pump 37QA(38QA).
(9) Remove the drain plug (2) and the O-ring (1) from the center tank fuel-pump 37QA (38QA). Let the fuel drain from the center tank fuel pump 37QA(38QA).
(10) Measure the quantity of fuel removed from the center tank fuel-pump 37QA(38QA). The amount of fuel drained from the center tank fuel-pump 37QA(38QA) must not be more than 0.25 l (0.07 USgal).
(11) Lubricate the new AIPC 28-21-51-01-100 SEALING RING (1) with Turbine Fuel-- Kerosene - (Material No.01ABA1) or Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) .
(12) Install the sealing ring (1) and the drain plug (2).
(13) Safety the drain plug (2) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(14) Refuel (Ref. AMM TASK 12-11-28-650-003) or transfer fuel (Ref. AMM TASK 28-25-00-869-001) as necessary so that the right wing tank inner-cell contains a minimum 750 kg (1653 lb) of fuel.
(15) Repeat this test procedure for the right center tank fuel-pump.

5. Close-up
Subtask 28-21-00-860-085-A ** ON A/C NOT FOR ALL

A. Aircraft Configuration
(1) Refuel, defuel or transfer fuel as necessary (Ref. AMM TASK 12-11-28-650-003), (Ref. AMM TASK 28-25-00-650-001) or (Ref. AMM TASK 28-25-00-869-001).
(2) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

Subtask 28-21-00-942-082-A ** ON A/C NOT FOR ALL

B. Removal of Equipment
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the safety barriers.
(3) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.02 06:17:24 UTC