Installation of the Outer Manhole Cover ACT

TASK 28-11-37-400-004-A
Installation of the Outer Manhole Cover ACT

WARNING: THIS PROCEDURE USES A FUEL SYSTEM ITEM THAT IS IN A CATEGORY KNOWN AS A CRITICAL DESIGN CONFIGURATION CONTROL LIMITATION (CDCCL). CDCCL IDENTIFIES AN ITEM THAT CAN BE THE SOURCE OF A POSSIBLE FUEL TANK IGNITION. YOU MUST KEEP ALL CDCCL ITEMS IN THE APPROVED CONFIGURATION. DAMAGE, WEAR OR CHANGES TO A CDCCL ITEM CAN CAUSE A POSSIBLE FUEL TANK EXPLOSION.

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

WARNING: BE CAREFUL NOT TO GET AIRCRAFT FUEL IN YOUR MOUTH OR IN YOUR EYES. IF YOU GET FUEL ON YOUR SKIN OR ON YOUR CLOTHES, FLUSH IT IMMEDIATELY WITH WATER. IF NECESSARY, GET MEDICAL HELP. AIRCRAFT FUEL IS POISONOUS.

WARNING: DO NOT GET YOUR CLOTHES SOAKED WITH FUEL.

WARNING: MAKE SURE THAT YOU HAVE THE CORRECT FIRE FIGHTING EQUIPMENT AVAILABLE.

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

ZONE: 130
ZONE: 150

1. Reason for the Job

NOTE: For the New Engine Option (NEO) aircraft with an Additional Center Tank (ACT) installed in the forward cargo compartment, the term ACT FWD can also be described as ACT 4.1.

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

REFERENCE	QTY	DESIGNATION
No specific	1	COVER - PROTECTION
No specific	Torque wrench: range to between 0.55 and 0.45 m.daN (48.67 and 39.82 lbf.in )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.03FAB1)	Mineral Oil base Grease-- Vaseline or Petrolatum -
(Material No.06LCG9)	Non Hardening Jointing Putty-Medium Temp. Area - -
(Material No.08BBB1)	Non Aqueous Cleaner-- Petroleum Based -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
130	FWD CARGO COMPT AFT BULKHEAD OF AVNCS COMPT TO FWD PRESSURE BULKHEAD OF WING CENTER BOX
150	AFT CARGO COMPARTMENT FWD PRESS BULKHEAD TO AFT BULKHEAD OF AFT CARGO COMPARTMENT

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
3	SEALING-FLAT	AIPC 28-11-27-24-020
5	SEALING-FLAT	AIPC 28-11-37-01-020
3	SEALING-FLAT	AIPC 28-11-84-30-020
3	SEALING-FLAT	AIPC 28-11-84-31-020

E. Referenced Information

REFERENCE	DESIGNATION
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
TASK 28-00-00-910-001-A	Fuel Safety Procedures
TASK 28-10-00-910-001-A	Safety Procedures When You Do Work in a Fuel Tank
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 28-11-27-400-001-A	Installation of the Additional Center Tank (ACT)
TASK 28-11-27-400-002-A	Installation of Additional Center Tank No.1 (ACT AFT1)
TASK 28-11-27-400-003-A	Installation of the Additional Center Tank No.2 (ACT AFT2)
TASK 28-28-00-710-003-A	Operational Test of the ACT Fuel Transfer-Pump Pressure Switch
TASK 28-28-00-790-003-A	Leak Test of the Outer Manhole Cover
Reinforced Outer Manhole Cover ** ON A/C NOT FOR ALL
Outer Manhole Cover of the ACT ** ON A/C NOT FOR ALL
Torque Sequence of the Outer Manhole Cover

3. Job Set-up
Subtask 28-11-37-860-062-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) Obey the safety procedures when you work in a fuel tank (Ref. AMM TASK 28-10-00-910-001).
(3) Make sure that the ground service network is energized
(Ref. AMM TASK 24-42-00-861-001).
(4) Make sure that a WARNING NOTICE(S) is(are) in position on:

Refuel/Defuel control-panels 800VU and 801VU
Fuel control-panel 40VU
Additional Center Tank (ACT) control-panel 28VU
to tell persons not to operate the fuel system.

Subtask 28-11-37-010-060-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Make sure that the Additional Center Tank (ACT) is removed (Ref. AMM TASK 28-11-27-000-001).

NOTE: Always remove the ACT from the cargo-compartment before you remove a manhole cover from the ACT.

Subtask 28-11-37-010-060-D ** ON A/C NOT FOR ALL

B. Get Access
(1) Make sure that the applicable ACT is removed from the aft cargo compartment:
(a) Make sure that ACT AFT2 is removed (Ref. AMM TASK 28-11-27-000-003).
(b) Make sure that ACT AFT1 is removed (Ref. AMM TASK 28-11-27-000-002).

4. Procedure
Subtask 28-11-37-420-055-C ** ON A/C NOT FOR ALL

A. Installation of the outer Manhole Cover
(1) Obey the safety procedures when you work in a fuel tank (Ref. AMM TASK 28-10-00-910-001).
(2) Remove the cover-protection from the manhole of the ACT.
(3) Clean the surface of the ACT manhole with Non Aqueous Cleaner-- Petroleum Based - (Material No.08BBB1) and Textile-Lint free Cotton - (Material No.14SBA1) .
(4) Do an inspection of the component interfaces and the adjacent area.
(a) Make sure there is no unwanted material in the interspaces of the inner and outer manhole.
(5) Prepare for electrical bonding:

WARNING: THIS INSTRUCTION IS APPLICABLE TO A CRITICAL DESIGN CONFIGURATION CONTROL LIMITATION (CDCCL) ITEM. CAREFULLY OBEY ALL GIVEN INSTRUCTIONS WHEN YOU DO THIS STEP. IF YOU DO NOT OBEY THESE INSTRUCTIONS, A DANGEROUS CONDITION CAN OCCUR THAT CAN CAUSE A POSSIBLE FUEL TANK EXPLOSION.

(a) Do the electrical bonding of components with conductive bolts and screws in the tank (Ref. AMM TASK 20-28-00-912-802).
(6) Put the new AIPC 28-11-37-01-020 SEALING-FLAT (5) in position on the manhole of the ACT.

NOTE: Always install a new sealing-flat.

(7) Put the outer manhole cover (4) in position on the ACT (1).

NOTE: Make sure that the sealing-flat is not bent when you put the outer manhole cover in position.

(8) Apply a thin layer of Non Hardening Jointing Putty-Medium Temp. Area - - (Material No.06LCG9) on the screws (3).
(9) Install the screws (3) and the washers (2) on the outer manhole cover (4).

NOTE: The screws and the washers of the bonding points must be installed on the initial position.

(10) Tighten the screws (3) in a sequence opposite to one another with your hand.
(11) Torque the screws (3) to to between 0.55 and 0.45 m.daN (48.67 and 39.82 lbf.in )

in a sequence opposite to one another.

Torque Sequence of the Outer Manhole Cover ** ON A/C NOT FOR ALL

(12) Torque the screws (3) again in a sequence opposite to one another, two hours after installation of the outer manhole cover (4).

Subtask 28-11-37-420-055-F ** ON A/C NOT FOR ALL

A. Installation of the outer manhole cover

NOTE: The procedure for the installation of the outer manhole cover is the same for all ACT types.

(1) When you connect/install the components, refer to the match marks made during the removal procedure.
(2) Remove the COVER - PROTECTION from the manhole of the ACT (1).
(3) Clean the surface of the outer manhole cover (2) with Non Aqueous Cleaner-- Petroleum Based - (Material No.08BBB1) and Textile-Lint free Cotton - (Material No.14SBA1) .
(4) Do an inspection of the component interfaces and the adjacent area.
(a) Make sure there is no unwanted material between the interfaces of the inner and outer manhole.
(5) Prepare for electrical bonding:

(a) Prepare the components for electrical bonding (Ref. AMM TASK 20-28-00-912-802).
(6) For ACT AFT1:
(a) Apply a thin layer of Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) on the new AIPC 28-11-84-30-020 SEALING-FLAT (3) in position on the manhole of the ACT (1).
(7) For ACT AFT2:
(a) Apply a thin layer of Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) on the new AIPC 28-11-84-31-020 SEALING-FLAT (3) or AIPC 28-11-27-24-020 SEALING-FLAT (3) in position on the manhole of the ACT (1).
(8) Install the sealing-flat (3) in position on the manhole of the ACT (1).
(9) Put the outer manhole cover (2) in position on the ACT (1).
(10) Make sure that the sealing-flat (3) is not bent when you put the outer manhole cover (2) in position.
(11) Install the washers (5) and (6) and the bolts (4) on the outer manhole cover (2).
(12) Tighten the bolts (4) with your hand in a sequence opposite to one another.

Torque Sequence of the Outer Manhole Cover ** ON A/C NOT FOR ALL

(13) TORQUE the bolts (4) to between 0.55 and 0.45 m.daN (48.67 and 39.82 lbf.in )

in a sequence opposite to one another.

Torque Sequence of the Outer Manhole Cover ** ON A/C NOT FOR ALL

(14) Do a check of the electrical bonding (Ref. AMM TASK 20-28-00-912-802).
(15) Apply surface protection on the bolts (4) and washers (6) (Ref. AMM TASK 20-28-00-912-802).

Subtask 28-11-37-790-053-A ** ON A/C NOT FOR ALL

B. Leak Test
(1) Do the leak test of the outer manhole cover (Ref. AMM TASK 28-28-00-790-003).

5. Close-up
Subtask 28-11-37-410-053-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Install the ACT in the aft cargo-compartment (Ref. AMM TASK 28-11-27-400-001).

Subtask 28-11-37-410-053-D ** ON A/C NOT FOR ALL

A. Close Access
(1) Install the applicable ACT in the cargo-compartment:
(a) For ACT AFT1:
1 Install the ACT AFT1 (Ref. AMM TASK 28-11-27-400-002).
(b) For ACT AFT2:
1 Install the ACT AFT2 (Ref. AMM TASK 28-11-27-400-003).

Subtask 28-11-37-710-050-A ** ON A/C NOT FOR ALL

B. Test(s)
(1) Do an operational test of the ACT fuel transfer-pump pressure-switch (Ref. AMM TASK 28-28-00-710-003).

Subtask 28-11-37-860-063-A ** ON A/C NOT FOR ALL

C. Put the aircraft back to the serviceable condition.
(1) Make sure that the work area is clean and clear of tools and other items.
(2) On refuel/defuel control-panels 800VU and 801VU, fuel control-panel 40VU and ACT control-panel 28VU:

Remove the WARNING NOTICE(S).

(3) De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).

[Rev.10 from 2021] 2026.04.02 06:17:05 UTC