Removal of the NEA Line in the Fuel Center Tank

TASK 47-20-49-000-801-A
Removal of the NEA Line in the Fuel Center Tank

WARNING: YOU MUST OBEY ALL THE SAFETY PROCEDURES WHEN YOU DO WORK IN OR NEAR THE FUEL TANK. IF YOU DO NOT OBEY THE SAFETY PROCEDURES, THERE IS A RISK OF:

DEATH OR INJURY TO PERSONS
DAMAGE TO THE AIRCRAFT OR OTHER EQUIPMENT.

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: MAKE SURE THAT THE SAFETY DEVICES AND THE WARNING NOTICES ARE IN POSITION BEFORE YOU START A TASK ON OR NEAR:

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

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

WARNING: YOU MUST WEAR SAFETY BREATHING EQUIPMENT WHEN YOU DO WORK IN THIS AREA. THIS AREA CAN CONTAIN AIR FROM THE TANK INERTING SYSTEM. AIR FROM THIS SYSTEM HAS A LOW-OXYGEN CONTENT AND CAN CAUSE INJURY AND DEATH.

ZONE: 141

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	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY BARRIER(S)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
141	WING CENTER BOX
148AZ

C. Referenced Information

REFERENCE	DESIGNATION
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 28-10-00-910-002-A	Access to the Fuel Tanks and the Work Areas
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 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
NEA line - Center Tank

3. Job Set-up
Subtask 47-20-49-941-052-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Put the SAFETY BARRIER(S) in position.

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.

(2) Obey the fuel safety procedures (Ref. AMM TASK 28-00-00-910-001).
(3) Put the WARNING NOTICE(S) in position:

On the HYD/FUEL control panel 40VU, to tell persons not to operate the fuel system
On the refuel/defuel control panel 800VU/801VU, to tell persons not to refuel the aircraft.

Subtask 47-20-49-860-055-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

Subtask 47-20-49-865-055-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	IGGS/CTRL	7YA	N28
** ON A/C NOT FOR ALL
121VU	IGGS/CTRL	7YA	P28
** ON A/C NOT FOR ALL
122VU	CSAS / CTRL	1HW	U17

Subtask 47-20-49-650-050-A ** ON A/C NOT FOR ALL

D. Fuel Configuration
(1) Defuel the center tank (Ref. AMM TASK 28-25-00-650-001) or move the fuel into a different tank (Ref. AMM TASK 28-25-00-869-001).
(2) Drain the remaining fuel from the center tank (Ref. AMM TASK 28-25-00-650-003).
(3) On the defuel/refuel control panel 800VU, make sure that:

All the valve control switches are set to the SHUT position.
The MODE SELECT switch is set to OFF position.

Subtask 47-20-49-010-054-A ** ON A/C NOT FOR ALL

E. Get Access
(1) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE at Zone 142.
(2) Get access to the center tank (Ref. AMM TASK 28-10-00-910-002).
(3) Remove the access panel 148AZ (Ref. AMM TASK 57-17-11-000-001).

4. Procedure

WARNING: DO NOT GO INTO THE WORK AREA UNTIL A MINIMUM OF 5 MINUTES AFTER YOU REMOVE THE ACCESS PANEL. LET AIR FLOW THROUGH THE WORK AREA. AIR FROM THIS SYSTEM HAS A LOW OXYGEN CONTENT AND CAN CAUSE INJURY OR DEATH.

Subtask 47-20-49-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the NEA line.

NOTE: Two persons are necessary to do this procedure.

(1) To remove the NEA pipe (1):
(a) Remove the self-locking nut (18) and disconnect the bonding lead (10) from the clamp (14). Remove the nut (17) and the screw (13).
(b) Remove the self-locking nut (46) and disconnect the bonding lead (48) from the clamp (47). Remove the nut (45) and the screw (44).
(c) Loosen the nut (43) from the union (42) and carefully disengage the NEA pipe (1) from the NEA pipe (2).
(d) Remove the bolts (8), (16) and the washers (9), (15) and disconnect the clamps (7), (12) from the support brackets (6), (11).
(e) Put CAP - BLANKING at the ends of disconnected pipe.
(2) To remove the NEA pipe (2):
(a) Remove the self-locking nut (49) and disconnect the bonding lead (48) from the clamp (41). Remove the nut (50) and the screw (40).
(b) Remove the self-locking nut (73) and disconnect the bonding lead (71) from clamp (77). Remove the nut (74) and the screw (78).
(c) Remove the self-locking nut (80) and disconnect the bonding lead (79) from the clamp (83). Remove the nut (81) and the screw (82).
(d) Loosen the nut (84) from the union (85) and carefully disengage the NEA pipe (2).
(e) Remove the bolts (53), (75) and the washers (54), (76) and disconnect the clamps (52), (72) from the support brackets (51) and (70).
(f) Put CAP - BLANKING at the ends of disconnected pipe.

[Rev.10 from 2021] 2026.04.02 06:26:18 UTC