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

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.

WARNING: DO NOT SPILL FUEL ON THE ENGINES OR THE BRAKES. IF YOU SPILL FUEL ON ENGINES OR BRAKES THAT ARE HOT, IT CAN CAUSE FIRES.

1. Reason for the Job
To drain the remaining fuel with Tool 98A28203000000.
To drain the remaining fuel with Tool 97A28002117002 or with Tool 98A28104000002, use TASK 28-25-00-650-003-A.

NOTE: If you do this procedure regularly it can prevent microbiological contamination of the fuel tanks.

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

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific	AR	BLOWING EQUIPMENT - HOT AIR
No specific	1	CONTAINER 10 L(2 1/2 USGAL)
No specific	AR	SAFETY BARRIER(S)
No specific	AR	WARNING NOTICE(S)
98A28203000000	1	TEST EQUIPMENT JET PUMP

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
195BB, 196BB

C. Referenced Information

REFERENCE	DESIGNATION
TASK 28-00-00-910-001-A	Fuel Safety Procedures
TASK 32-00-00-481-001-A	Installation of the Safety Devices on the Landing Gears
Defuel Safety Area ** ON A/C NOT FOR ALL
Defuel Safety Area ** ON A/C NOT FOR ALL
To Drain the Remaining Fuel ** ON A/C NOT FOR ALL
To Drain the Remaining Fuel ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 28-25-00-941-069-B

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) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
(3) Make sure that the ground safety locks are installed on the landing gear (Ref. AMM TASK 32-00-00-481-001).
(4) On the panel 400VU:

make sure that the landing-gear control-lever 6GA is in the DOWN position
put a warning notice in position to tell persons not to operate the landing gear.

(5) Put WARNING NOTICE(S) in position to tell persons not to operate the landing gear doors.
(6) If the fuel temperature is less than -5 DEG.C (23.00 DEG.F) and/or the water drain valves are frozen, heat the drain valve areas with an approved BLOWING EQUIPMENT - HOT AIR.

NOTE: Do not apply unusually high force to open the water drain valve.

Subtask 28-25-00-010-071-B

B. Get Access
(1) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE below the applicable water drain valve.
(2) Put the CONTAINER 10 L(2 1/2 USGAL) below the applicable water drain valve.
(3) For access to the center tank water drain valves, open the applicable access panels:

for water drain valve 94QM, open access panel 195BB
for water drain valve 95QM, open access panel 196BB.

4. Procedure
Subtask 28-25-00-650-064-B

A. To Drain Remaining Fuel
(1) On the 98A28203000000 TEST EQUIPMENT JET PUMP fully retract the nut (4), the screw (3) and the plunger assembly (1).
(2) Install the 98A28203000000 TEST EQUIPMENT JET PUMP:
(a) Put the hexagonal end of the bush (2) into the base plate of the water drain valve.
(b) Turn the bush (2) through 30 deg.
(c) Turn the nut (4) until it touches and seals against the bottom skin.
(d) Put the end of the hose into the container.
(e) Hold the bush (2) and turn the screw (3) to the end of its travel. This causes the plunger (1) to open the drain valve and the fuel to flow.
(3) When the fuel flow stops, hold the bush (2) and turn the screw (3) until the drain valve closes.
(4) Remove the 98A28203000000 TEST EQUIPMENT JET PUMP:
(a) Turn the nut (4) until it is clear of the wing surface.
(b) Turn the bush (2) back through 30 deg. and remove the 98A28203000000 TEST EQUIPMENT JET PUMP from the applicable water drain valve.
(5) Examine the water drain valve for leakage. Leaks are not permitted.

NOTE: This step is very important because access to the center tank water drain valves 94QM and 95QM is not easy.

5. Close-up
Subtask 28-25-00-410-075-B

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the applicable access panels:

for water drain valve 94QM, close access panel 195BB
for water drain valve 95QM, close access panel 196BB.

Subtask 28-25-00-942-073-A

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 access platform(s).
(4) Remove the WARNING NOTICE(S).
(5) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.01 00:06:04 UTC