Leak Test with Fuel of the Wing Tank

TASK 28-11-00-790-008-A
Leak Test with Fuel of the Wing 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.

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	ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific	AR	ACCESS PLATFORM 4M (13 FT)
No specific	AR	ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE
No specific	AR	BRUSH - BRISTLED, SOFT
No specific	AR	GROUND AIR-SUPPLY UNIT(LOW PRESSURE)
No specific	AR	SAFETY BARRIER(S)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)
98D28004080001	2	GAG - CLACK VALVE

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.14CDB1)	Testing Medium-Fuel Leak Detection White Powder -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
148AZ, 521AB, 521AZ, 521BZ, 521CB, 521EB, 522AB, 522CB, 522FB, 522HB, 522JB, 522KB, 522LB, 522NB, 522QB, 550AB, 574AB, 574BB, 575AB, 575BB, 575CB, 575DB, 575EB, 575FB, 575GB, 575HB, 621AB, 621AZ, 621BZ, 621CB, 621EB, 622AB, 622CB, 622FB, 622HB, 622JB, 622KB, 622LB, 622NB, 622QB, 650AB, 674AB, 674BB, 675AB, 675BB, 675CB, 675DB, 675EB, 675FB, 675GB, 675HB
147AZ

D. Referenced Information

REFERENCE	DESIGNATION
TASK 12-11-28-650-003-A	Pressure Refuel with Automatic Control
TASK 27-50-00-866-008-A	Extension of the Flaps on the Ground
TASK 27-50-00-866-008-A-01	Extension of the Flaps/Slats on the Ground
TASK 27-50-00-866-009-A	Retraction of the Flaps on the Ground
TASK 27-50-00-866-009-A-01	Retraction of the Flaps/Slats on the Ground
TASK 27-60-00-866-002-A	Extension-Retraction of the Spoilers for Maintenance
TASK 28-10-00-910-001-A	Safety Procedures When You Do Work in a Fuel Tank
TASK 28-10-00-910-002-A	Access to the Fuel Tanks and the Work Areas
TASK 28-12-47-000-001-A	Removal of the NACA Vent Intake
TASK 28-12-47-400-001-A	Installation of the NACA Vent Intake
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
TASK 32-12-00-010-001-A	Open the Main Gear Doors for Access
TASK 32-12-00-410-001-A	Close the Main Gear Doors after Access
TASK 57-17-11-000-001-A	Removal of Access Cover 147AZ(148AZ)
TASK 57-17-11-000-001-B	Removal of Access Cover 148AZ or/and the ACT-Equipment Support Door
TASK 57-17-11-400-001-A	Installation of Access Cover 147AZ(148AZ)
TASK 57-17-11-400-001-B	Installation of Access Cover 148AZ or/and the ACT-Equipment Support-Door
TASK 57-27-11-000-005-A	Removal of the Access Panel
TASK 57-27-11-400-005-A	Installation of the Access Panel
TASK 57-27-11-400-005-D	Installation of the Access Panel
TASK 57-27-11-400-005-E	Installation of the Access Panel
TASK 57-41-37-000-004-A	Removal of the Pressure Relief Panels
TASK 57-41-37-000-006-A	Removal of the Access Panels
TASK 57-41-37-400-002-A	Installation of the Pressure Relief Panels
TASK 57-41-37-400-006-A	Installation of the Access Panels
TASK 57-51-37-000-004-A	Removal of the Access Panels 575AB(675AB), 575BB(675BB), 575CB(675CB), 575DB(675DB), 575EB(675EB), 575FB(675FB), 575GB(675GB), 575HB(675HB)
TASK 57-51-37-000-008-A	Removal of the Access Door
TASK 57-51-37-400-004-A	Installation of the Access Panels 575AB(675AB), 575BB(675BB), 575CB(675CB), 575DB(675DB), 575EB(675EB), 575FB(675FB), 575GB(675GB), 575HB(675HB)
TASK 57-51-37-400-006-A	Installation of the Access Panel 575JB(675JB)
TASK 57-51-37-400-008-A	Installation of the Access Door
Clack Valve Gag - Installation

3. Job Set-up
Subtask 28-11-00-941-085-A ** ON A/C NOT FOR ALL

A. Safety Precautions

WARNING: BEFORE YOU DO WORK IN OR NEAR A FUEL TANK, MAKE SURE THAT YOU OBEY ALL THE SAFETY PROCEDURES. THIS WILL PREVENT INJURY TO PERSONS AND/OR DAMAGE TO THE AIRCRAFT.

(1) You must obey the fuel safety procedures when you do work in a fuel tank (Ref. AMM TASK 28-10-00-910-001).
(2) Put a WARNING NOTICE(S) in the cockpit to tell persons not to operate the flight controls.
(3) Put a WARNING NOTICE(S) in position to tell persons not to operate the landing gear doors.
(4) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.

Subtask 28-11-00-480-053-A ** ON A/C NOT FOR ALL

B. Install Test Equipment

Clack Valve Gag - Installation ** ON A/C NOT FOR ALL

(1) Drain the remaining fuel from the vent surge tank (Ref. AMM TASK 28-25-00-650-003).
(2) Put the ACCESS PLATFORM 4M (13 FT) in position below the applicable zone 550 or 650.
(3) Remove the applicable NACA vent intake 550AB(650AB) (Ref. AMM TASK 28-12-47-000-001) and (Ref. AMM TASK 28-10-00-910-002).
(4) Install the 98D28004080001 GAG - CLACK VALVE in the clack valves. Tighten the nut (1) to retain each of the 98D28004080001 GAG - CLACK VALVE in the clack valves.
(5) Make sure that the flags (1) hang from the related, open, NACA vent intake door 550AB(650AB).

Subtask 28-11-00-650-110-A ** ON A/C NOT FOR ALL

C. Fuel Configuration
(1) The applicable wing tank must be full of fuel for a minimum of 30 minutes before the test.
(2) Fully refuel the applicable wing tank (Ref. AMM TASK 12-11-28-650-003).
(3) Drain the remaining fuel from the center tank (Ref. AMM TASK 28-25-00-650-003).

Subtask 28-11-00-860-071-A ** ON A/C NOT FOR ALL

D. Aircraft Maintenance Configuration
(1) Extend the flaps fully (Ref. AMM TASK 27-50-00-866-008).
(2) Make sure that the 98D27803000000 LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION is on the slat/flap control lever.
(3) Extend the spoilers fully (Ref. AMM TASK 27-60-00-866-002).
(4) Make sure that the 98D27604000000 COLLAR-SAFETY, SPOILER or 98D27604004000 COLLAR SAFETY SPOILER is on each of the spoiler servo-controls.

Subtask 28-11-00-865-102-A ** ON A/C NOT FOR ALL

E. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	FUEL/L WING TK/PUMP2 SPLY	7QA	N26
121VU	FUEL/L WING TK/PUMP1 SPLY	1QA	N23
121VU	FUEL/R WING TK/PUMP2 SPLY	8QA	Q26
121VU	FUEL/R WING TK/PUMP1 SPLY	2QA	Q23
121VU	FUEL/CTR TK/AUTO/CTL	3QL	R27
121VU	FUEL/CTR TK/L&R XFR/CTL & IND	2QL	R26
121VU	FUEL/CTR TK/L&R XFR/CTL & IND	1QL	R25
123VU	L WING TK/PUMP 1/STBY SPLY	11QA	AD12
123VU	R WING TK/PUMP 1/STBY SPLY	12QA	AE12

Subtask 28-11-00-010-071-D ** ON A/C NOT FOR ALL

F. Get Access
(1) Open the MLG doors (Ref. AMM TASK 32-12-00-010-001).
(2) Make sure that the 460005835 SLEEVE - GROUND LOCK is on the applicable MLG door actuator.
(3) Put an ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in the applicable MLG bay below the access panel 147AZ 148AZ.
(4) Remove the applicable access panel 147AZ 148AZ, (Ref. AMM TASK 57-17-11-000-001) and (Ref. AMM TASK 28-10-00-910-002).
(5) Put an ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE below the applicable zone 521(621).
(6) Put an ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE below the applicable zone 522(622).
(7) Put an ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in the applicable MLG bay below the Wing tank rear spar.
(8) Put an ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE below the applicable zone 574(674).
(9) Put an ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE below the applicable zone 575(675).
(10) Remove the applicable leading-edge access-panels 521AB 521CB 521EB 522AB 522CB 522FB 522HB 522JB 522KB 522LB 522NB 522QB, 621AB 621CB 621EB 622AB 622CB 622FB 622HB 622JB 622KB 622LB 622NB 622QB (Ref. AMM TASK 57-41-37-000-004) (Ref. AMM TASK 57-41-37-000-006).
(11) Remove the applicable trailing edge access panels 574AB 574BB 575AB 575BB 575CB 575DB 575EB 575FB 575GB 575HB 674AB 674BB 675AB 675BB, 675CB 675DB 675EB 675FB 675GB 675HB (Ref. AMM TASK 57-51-37-000-008) (Ref. AMM TASK 57-51-37-000-004).
(12) Remove the applicable dry-bay access-cover 521AZ 521BZ 621AZ 621BZ (Ref. AMM TASK 57-27-11-000-005).

Subtask 28-11-00-010-071-E ** ON A/C NOT FOR ALL

F. Get Access
(1) Open the MLG doors (Ref. AMM TASK 32-12-00-010-001).
(2) Make sure that the 460005835 SLEEVE - GROUND LOCK is on the applicable MLG door actuator.
(3) Put an ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in the applicable MLG bay below the access panel 148AZ.
(4) Remove the applicable access panel 148AZ, (Ref. AMM TASK 57-17-11-000-001) and (Ref. AMM TASK 28-10-00-910-002).
(5) Put an ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE below the applicable zone 521(621).
(6) Put an ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE below the applicable zone 522(622).
(7) Put an ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in the applicable MLG bay below the Wing tank rear spar.
(8) Put an ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE below the applicable zone 574(674).
(9) Put an ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE below the applicable zone 575(675).
(10) Remove the applicable leading-edge access-panels 521AB 521CB 521EB 522AB 522CB 522FB 522HB 522JB 522KB 522LB 522NB 522QB, 621AB 621CB 621EB 622AB 622CB 622FB 622HB 622JB 622KB 622LB 622NB 622QB (Ref. AMM TASK 57-41-37-000-004) (Ref. AMM TASK 57-41-37-000-006).
(11) Remove the applicable trailing edge access panels 574AB 574BB 575AB 575BB 575CB 575DB 575EB 575FB 575GB 575HB 674AB 674BB 675AB 675BB, 675CB 675DB 675EB 675FB 675GB 675HB (Ref. AMM TASK 57-51-37-000-004) (Ref. AMM TASK 57-51-37-000-008).
(12) Remove the applicable dry-bay access-cover 521AZ 521BZ 621AZ 621BZ (Ref. AMM TASK 57-27-11-000-005).

4. Procedure
Subtask 28-11-00-790-064-A ** ON A/C NOT FOR ALL

A. Visual Inspection
(1) Look for signs of fuel leakage in these areas:

tank seals and sealant
structure, brackets and clamps
fuel pipelines, couplings, bonded items, brackets and clamps.

(2) Talcum Powder Procedure:

WARNING: WHEN YOU USE COMPRESSED AIR:

USE THE CORRECT PROTECTION (FACE SHIELD OR GOGGLES)
DO NOT POINT THE AIRFLOW AT YOURSELF OR OTHER PERSONS.

LOOSE PARTICLES AND/OR HIGH PRESSURE AIR CAN CAUSE INJURY.

CAUTION: USE THE TALCUM POWDER PROCEDURE ONLY ON THE EXTERNAL SURFACES OF THE FUEL TANKS.

(a) Dry the area of the possible leak with a Textile-Lint free Cotton - (Material No.14SBA1) .
(b) Dry the area fully with a GROUND AIR-SUPPLY UNIT(LOW PRESSURE).
(c) Apply Testing Medium-Fuel Leak Detection White Powder - (Material No.14CDB1) to the area with a BRUSH - BRISTLED, SOFT.
(d) Monitor the area for a change in color of the talcum powder. This will show the location of a fuel leak and the rate of the leakage.

5. Close-up
Subtask 28-11-00-080-054-A ** ON A/C NOT FOR ALL

A. Remove Test Equipment
(1) Loosen the nut (1) and remove the 98D28004080001 GAG - CLACK VALVE from the clack valves.

Subtask 28-11-00-410-071-D ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the applicable NACA vent intake 550AB 650AB (Ref. AMM TASK 28-12-47-400-001).
(3) Install the applicable dry-bay access cover 521AZ 521BZ 621AZ 621BZ (Ref. AMM TASK 57-27-11-400-005).
(4) Install the applicable access panels 147AZ 148AZ (Ref. AMM TASK 57-17-11-400-001).
(5) Install the applicable leading-edge access-panels 521AB 521CB 521EB 522AB 522CB 522FB 522HB 522JB 522KB 522LB 522NB 522QB, 621AB 621CB 621EB 622AB 622CB 622FB 622HB 622JB 622KB 622LB 622NB 622QB (Ref. AMM TASK 57-41-37-400-002) (Ref. AMM TASK 57-51-37-400-006).
(6) Install the applicable trailing edge access panels 574AB 574BB 575AB 575BB 575CB 575DB 575EB 575FB 575GB 575HB 674AB 674BB 675AB 675BB, 675CB 675DB 675EB 675FB 675GB 675HB (Ref. AMM TASK 57-51-37-400-004) (Ref. AMM TASK 57-51-37-400-008).

Subtask 28-11-00-410-071-E ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the applicable NACA vent intake 550AB 650AB (Ref. AMM TASK 28-12-47-400-001).
(3) Install the applicable dry-bay access cover 521AZ 521BZ 621AZ 621BZ (Ref. AMM TASK 57-27-11-400-005).
(4) Install the applicable access panels 148AZ (Ref. AMM TASK 57-17-11-400-001).
(5) Install the applicable leading-edge access-panels 521AB 521CB 521EB 522AB 522CB 522FB 522HB 522JB 522KB 522LB 522NB 522QB, 621AB 621CB 621EB 622AB 622CB 622FB 622HB 622JB 622KB 622LB 622NB 622QB (Ref. AMM TASK 57-41-37-400-002) (Ref. AMM TASK 57-41-37-400-006).
(6) Install the applicable trailing edge access panels 574AB 574BB 575AB 575BB 575CB 575DB 575EB 575FB 575GB 575HB 674AB 674BB 675AB 675BB, 675CB 675DB 675EB 675FB 675GB 675HB (Ref. AMM TASK 57-51-37-400-004) (Ref. AMM TASK 57-51-37-400-008).

Subtask 28-11-00-860-070-A ** ON A/C NOT FOR ALL

C. Aircraft Maintenance Configuration
(1) Retract the flaps fully (Ref. AMM TASK 27-50-00-866-009).
(2) Retract the spoilers fully (Ref. AMM TASK 27-60-00-866-002).
(3) On the spoiler servo-control, make sure that the pointer on the hex. head is opposite the letter 'O' on the housing.
(4) Remove the access platform(s).
(5) Close the MLG doors (Ref. AMM TASK 32-12-00-410-001).
(6) Refuel, defuel or transfer fuel, as necessary (Ref. AMM TASK 28-25-00-869-001) (Ref. AMM TASK 12-11-28-650-003) (Ref. AMM TASK 28-25-00-650-001).

Subtask 28-11-00-865-104-A ** ON A/C NOT FOR ALL

D. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	FUEL/L WING TK/PUMP2 SPLY	7QA	N26
121VU	FUEL/L WING TK/PUMP1 SPLY	1QA	N23
121VU	FUEL/R WING TK/PUMP2 SPLY	8QA	Q26
121VU	FUEL/R WING TK/PUMP1 SPLY	2QA	Q23
121VU	FUEL/CTR TK/AUTO/CTL	3QL	R27
121VU	FUEL/CTR TK/L&R XFR/CTL & IND	2QL	R26
121VU	FUEL/CTR TK/L&R XFR/CTL & IND	1QL	R25
123VU	L WING TK/PUMP 1/STBY SPLY	11QA	AD12
123VU	R WING TK/PUMP 1/STBY SPLY	12QA	AE12

Subtask 28-11-00-942-087-A ** ON A/C NOT FOR ALL

E. 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 98D27803500001 LOCKING TOOL ZERO POS from the flap/slat control lever.
(5) Remove the WARNING NOTICE(S).
(6) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.02 06:17:00 UTC