Leak Test of the Inner Manhole Cover

TASK 28-28-00-790-002-A
Leak Test of the Inner Manhole Cover

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

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

REFERENCE	QTY	DESIGNATION
No specific	1	AIR SOURCE 0.3 TO 0.7 BAR (5 TO 10 PSI)- FILTERED, DRY
No specific	1	GAGE - REGULATOR PRESSURE, WITH SHUTOFF VALVE (1BAR TO
No specific	Torque wrench: range to between 1.06 and 0.82 m.daN (93.81 and 72.57 lbf.in )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.03FAB1)	Mineral Oil base Grease-- Vaseline or Petrolatum -

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
11	BLANKING FLANGE	AIPC 28-11-04-05-030
12	O-RING	AIPC 28-11-04-05-040
3	O-RING	AIPC 28-11-04-05-040
13	O-RING	AIPC 28-11-04-05-060
4	O-RING	AIPC 28-11-04-05-060
17	PLUG	AIPC 28-11-04-05-070
16	O-RING	AIPC 28-11-04-05-080
2	BLANKING FLANGE	AIPC 28-11-04-05-090
19	CAP	AIPC 28-11-04-05-100
7	PLUG	AIPC 28-11-04-05-110
6	O-RING	AIPC 28-11-04-05-120
11	BLANKING FLANGE	AIPC 28-11-82-46-030
12	O-RING	AIPC 28-11-82-46-040
3	O-RING	AIPC 28-11-82-46-040
13	O-RING	AIPC 28-11-82-46-060
4	O-RING	AIPC 28-11-82-46-060
17	PLUG	AIPC 28-11-82-46-070
16	O-RING	AIPC 28-11-82-46-080
2	BLANKING FLANGE	AIPC 28-11-82-46-090
19	CAP	AIPC 28-11-82-46-100
7	PLUG	AIPC 28-11-82-46-110
6	O-RING	AIPC 28-11-82-46-120
11	BLANKING FLANGE	AIPC 28-11-84-05-030
12	O-RING	AIPC 28-11-84-05-043
3	O-RING	AIPC 28-11-84-05-043
13	O-RING	AIPC 28-11-84-05-063
4	O-RING	AIPC 28-11-84-05-063
17	PLUG	AIPC 28-11-84-05-073
16	O-RING	AIPC 28-11-84-05-080
2	BLANKING FLANGE	AIPC 28-11-84-05-093
19	CAP	AIPC 28-11-84-05-130
7	PLUG	AIPC 28-11-84-05-150
6	O-RING	AIPC 28-11-84-05-160

D. Referenced Information

REFERENCE	DESIGNATION
TASK 28-00-00-910-001-A	Fuel Safety Procedures
TASK 28-11-27-000-001-A	Removal of the Additional Center Tank (ACT)
TASK 28-11-27-000-002-A	Removal of Additional Center Tank No.1 (ACT AFT1)
TASK 28-11-27-000-003-A	Removal of the Additional Center Tank No.2 (ACT AFT2)
TASK 28-11-37-000-004-A	Removal of the Outer Manhole-Cover ACT
TASK 28-11-37-400-004-A	Installation of the Outer Manhole Cover ACT
TASK 28-28-55-000-001-A	Removal of the ACT Vent Shut-off Valve Actuator
TASK 28-28-55-400-001-A	Installation of the ACT Vent Shut-off Valve Actuator
Blank Flanges and Caps for the ACT ** ON A/C NOT FOR ALL
Blank Flanges and Caps for the ACT ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 28-28-00-860-140-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Obey the fuel safety procedures (Ref. AMM TASK 28-00-00-910-001).
(2) Make sure that the applicable ACT is removed from the aircraft (Ref. AMM TASK 28-11-27-000-001).
(3) Make sure that the outer Manhole Cover is removed from the ACT (Ref. AMM TASK 28-11-37-000-004).
(4) Make sure that the structural container of the ACT is fully equipped and that the ACT is free of fuel.

Subtask 28-28-00-550-053-A ** ON A/C NOT FOR ALL

B. Close the openings of the ACT.

Blank Flanges and Caps for the ACT ** ON A/C NOT FOR ALL

(1) Apply a thin layer of Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) to the AIPC 28-11-04-05-120 O-RING (6).
(2) Install the AIPC 28-11-04-05-110 PLUG (7) with the O-ring (6) on the cavity drain port of the ACT.
(3) Install the AIPC 28-11-04-05-100 CAP (19) on the non-return valve on the top surface of the ACT.

NOTE: The designation forward and aft are the given direction when the ACT is installed in the aircraft.

(4) On the forward side of the ACT:
(a) Apply a thin layer of Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) to the AIPC 28-11-04-05-040 O-RING (3) and AIPC 28-11-04-05-060 O-RING (4).
(b) Put the O-rings (3) and (4) in position on the AIPC 28-11-04-05-090 BLANKING FLANGE (2) on the fuel pipe flange.
(c) Install the nuts (1) on the studs (5).
(d) Apply a thin layer of Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) to the AIPC 28-11-04-05-040 O-RING (12) and AIPC 28-11-04-05-060 O-RING (13).
(e) Put the O-rings (12) and (13) in position on the AIPC 28-11-04-05-030 BLANKING FLANGE (11) on the vent pipe flange.
(f) Install the nuts (10) on the studs (14).

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

(g) Remove and discard the lockwire from the AIPC 28-11-04-05-070 PLUG (17).
(h) Remove the plug (17) and the AIPC 28-11-04-05-080 O-RING (16) from the blanking flange (11) to connect the test equipment to vent pipe flange.
(5) On the aft side of the ACT:
(a) Apply a thin layer of Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) to the AIPC 28-11-04-05-040 O-RING (3) and AIPC 28-11-04-05-060 O-RING (4).
(b) Put the O-rings (3) and (4) in position on the AIPC 28-11-04-05-090 BLANKING FLANGE (2) on the fuel pipe flange and the vent pipe flange.
(c) Install the nuts (1) on the studs (5).

Subtask 28-28-00-860-140-C ** ON A/C NOT FOR ALL

C. Aircraft Maintenance Configuration
(1) Obey the fuel safety procedures (Ref. AMM TASK 28-00-00-910-001).
(2) Make sure that the applicable ACT is removed from the aircraft (Ref. AMM TASK 28-11-27-000-002) (Ref. AMM TASK 28-11-27-000-003) (Ref. AMM D/O 28-11-27-00).
(3) Make sure that the outer manhole cover is removed from the ACT (Ref. AMM TASK 28-11-37-000-004).
(4) Make sure that the structural container of the ACT is fully equipped and that the ACT is free of fuel.

Subtask 28-28-00-550-053-E ** ON A/C NOT FOR ALL

D. Close the openings of the applicable ACT.

Blank Flanges and Caps for the ACT ** ON A/C NOT FOR ALL

(1) Apply a thin layer of Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) on the AIPC 28-11-84-05-160 O-RING (6)AIPC 28-11-82-46-120 O-RING (6).
(2) Install the AIPC 28-11-84-05-150 PLUG (7)AIPC 28-11-82-46-110 PLUG (7) with the O-ring (6) on the cavity drain port of the ACT.
(3) Install the AIPC 28-11-84-05-130 CAP (19)AIPC 28-11-82-46-100 CAP (19) on the non return valve on the top surface of the ACT.

NOTE: The designation forward and aft are the given direction when the ACT is installed in the aircraft.

(4) On the forward side of the ACT:
(a) Apply a thin layer of Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) on the AIPC 28-11-84-05-043 O-RING (3)AIPC 28-11-82-46-040 O-RING (3) and the AIPC 28-11-84-05-063 O-RING (4)AIPC 28-11-82-46-060 O-RING (4).
(b) Put the O-rings (3) and (4) in position on the AIPC 28-11-84-05-093 BLANKING FLANGE (2)AIPC 28-11-82-46-090 BLANKING FLANGE (2) on the fuel pipe flange.
(c) Install the nuts (1) on the studs (5).
(d) TORQUE the nuts (1) opposite to each other to between 1.06 and 0.82 m.daN (93.81 and 72.57 lbf.in )

.
(e) Apply a thin layer of Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) on the AIPC 28-11-84-05-043 O-RING (12)AIPC 28-11-82-46-040 O-RING (12) and the AIPC 28-11-84-05-063 O-RING (13)AIPC 28-11-82-46-060 O-RING (13).
(f) Put the O-rings (12) and (13) in position on the AIPC 28-11-84-05-030 BLANKING FLANGE (11)AIPC 28-11-82-46-030 BLANKING FLANGE (11) on the vent pipe flange.
(g) Install the nuts (10) on the studs (14).
(h) TORQUE the nuts (10) opposite to each other to between 1.06 and 0.82 m.daN (93.81 and 72.57 lbf.in )

(i) Remove and discard the lockwire from the AIPC 28-11-84-05-073 PLUG (17)AIPC 28-11-82-46-070 PLUG (17).
(j) Remove the plug (17) and the AIPC 28-11-84-05-080 O-RING (16)AIPC 28-11-82-46-080 O-RING (16) from the blanking flange (11) to connect the test equipment to vent pipe flange.
(5) On the aft side of the ACT:
(a) Apply a thin layer of Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) to the AIPC 28-11-84-05-043 O-RING (3)AIPC 28-11-82-46-040 O-RING (3) and AIPC 28-11-84-05-063 O-RING (4)AIPC 28-11-82-46-060 O-RING (4).
(b) Put the O-rings (3) and (4) in position on the AIPC 28-11-84-05-093 BLANKING FLANGE (2)AIPC 28-11-82-46-090 BLANKING FLANGE (2) on the fuel pipe flange and the vent pipe flange.
(c) Install the nuts (1) on the studs (5).
(d) TORQUE the nuts (1) opposite to each other to between 1.06 and 0.82 m.daN (93.81 and 72.57 lbf.in )

4. Procedure
Subtask 28-28-00-860-141-A ** ON A/C NOT FOR ALL

A. Preparation for the Test
(1) Open the Vent Valve of the ACT (167QM) manually:
(a) Remove the Actuator of ACT Vent Valve (4QH) from the ACT (Ref. AMM TASK 28-28-55-000-001).
(b) Open the Vent Valve with a screwdriver.
(c) Make sure that the position indicator of the Vent Valve is in the open position (in line).
(2) Connect an AIR SOURCE 0.3 TO 0.7 BAR (5 TO 10 PSI)- FILTERED, DRY with a GAGE - REGULATOR PRESSURE, WITH SHUTOFF VALVE (1BAR TO to the open bleed port on the blanking cap of the vent line.

Subtask 28-28-00-860-141-F ** ON A/C NOT FOR ALL

A. Preparation for the Test

NOTE: If you do the leak test on the ACT FWD, you must open the vent isolation valve of the ACT FWD before you do the test.

(1) On the ACT FWD, open the vent isolation valve (232QM) manually:
(a) Remove the actuator of the vent isolation valve (93QH) from the ACT FWD (Ref. AMM D/O 28-28-57-00).
(b) Open the vent isolation valve with a screwdriver.
(c) Make sure that the position of the indicator of the vent isolation valve is in the open position (in line).
(2) Connect an AIR SOURCE 0.3 TO 0.7 BAR (5 TO 10 PSI)- FILTERED, DRY with a GAGE - REGULATOR PRESSURE, WITH SHUTOFF VALVE (1BAR TO to the open bleed port on the blanking cap of the vent pipe.

Subtask 28-28-00-790-051-A ** ON A/C NOT FOR ALL

B. Leak Test

ACTION	RESULT
1.On the air compressed source: Carefully pressurize the bladder of the ACT to 200 mbar (2.90 psi). NOTE: Make sure that the air pressure is not more than 275 mbar (3.99 psi).	On the pressure gauge: The air pressure in the bladder increases to 200 mbar (2.90 psi).
2.On the air compressed source: Stop the ground air supply.	On the pressure gauge: Make sure that the air pressure in the bladder is stable for 15 minutes.
3.Apply a soap solution or a leak detection spray on the inner manhole cover of the ACT.	Make sure that there are no leaks on the inner manhole cover. NOTE: If you find a leak, check the correct installation of the inner manhole cover and do the leak test again.
4.On the air compressed source: Carefully release the air pressure from the bladder of the ACT.	On the pressure gauge: The air pressure in the bladder decreases to 0 mbar (0.00 psi).

5. Close-up
Subtask 28-28-00-410-069-A ** ON A/C NOT FOR ALL

A. Put the system back to the serviceable condition.
(1) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(2) Remove the PLUG-BLANKING from each disconnected line end.
(3) Do an inspection of the component interfaces and the adjacent area.
(4) Close the Vent Valve of the ACT (167QM) manually:
(a) Close the Vent Valve with a screwdriver.
(b) Make sure that the position indicator of the Vent Valve is in the closed position (cross line).
(5) Install the Actuator of ACT Vent Valve (4QH) on the ACT (Ref. AMM TASK 28-28-55-400-001).
(6) Install the outer Manhole Cover of the ACT (Ref. AMM TASK 28-11-37-400-004).
(7) Make sure that the work area is clean and clear of tools and other items.

Subtask 28-28-00-410-069-F ** ON A/C NOT FOR ALL

A. Put the system back to the serviceable condition.
(1) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(2) Remove the PLUG-BLANKING from each disconnected line end.
(3) Do an inspection of the component interfaces and the adjacent area.
(4) On the ACT FWD, close the vent isolation valve (232QM) manually:
(a) Close the Vent Isolation Valve with a screwdriver.
(b) Make sure that the position of the indicator of vent isolation valve is in the close position.
(5) Install the actuator of the vent isolation valve (93QH) on the ACT FWD (Ref. AMM D/O 28-28-57-40).
(6) Install the outer manhole cover of the ACT (Ref. AMM TASK 28-11-37-400-004).
(7) Make sure that the work area is clean and clear of tools and other items.

[Rev.10 from 2021] 2026.04.02 06:17:53 UTC