Removal of the NEA Line on the Outside of the Fuel Center Tank

TASK 47-20-49-000-805-A
Removal of the NEA Line on the Outside of 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: MAKE SURE THAT:

THERE ARE NO CAPS OR COVERS ON THE FUEL TANK VENTILATION DUCTS. CAPS OR COVERS WILL CAUSE OVERPRESSURE OR UNDERPRESSURE DAMAGE TO THE FUEL TANK.
NO PERSONS ARE NEAR THE FUEL TANK OR VENTILATION DUCTS OF THE FUEL TANK.

WARNING: DO NOT TOUCH HOT PARTS WITHOUT APPLICABLE GLOVES. HOT PARTS CAN CAUSE AN INJURY.

ZONE: 137

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	CAP - BLANKING
No specific	AR	SAFETY BARRIER(S)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
137	BAY BETW AFT PART. BULKHEAD OF FWD CARGO

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 25-54-12-000-001-A	Removal of the Forward Cargo-Compartment Partition
TASK 53-32-12-000-002-A	Removal of the Cabin Floor Panels
TASK 06-41-53-00	FUSELAGE-DESCRIPTION AND OPERATION
NEA line on the Outside of the Fuel Center Tank ** ON A/C NOT FOR ALL
NEA line on the Outside of the Fuel Center Tank ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 47-20-49-941-056-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) Put the SAFETY BARRIER(S) in position.

Subtask 47-20-49-860-058-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 47-20-49-865-058-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 47-20-49-010-056-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Remove the cabin-floor access panels between FR35 and FR42 (Ref. AMM TASK 53-32-12-000-002) (Ref. AMM D/O 06-41-53-00).
(2) Remove the forward cargo-compartment partition-panels at FR34 (Ref. AMM TASK 25-54-12-000-001) (Ref. AMM D/O 06-41-53-00).

4. Procedure
Subtask 47-20-49-020-053-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 nuts (19) and the washers (18) from the clamps (17) and (26).
(b) Remove the screws (22) and the washers (23) and disconnect the bonding leads (15) from the clamps (17) and (26).
(c) Remove the self-locking nuts (38) and the washers (39) from the clamps (40) and (43).
(d) Remove the screws (41) and the washers (42) and disconnect the bonding leads (44) from the clamps (40) and (43).
(e) Remove the self-locking nut (29) and the washer (31) from the clamp (32).
(f) Remove the screw (34) and the washer (33) and disconnect the bonding lead (35) from the clamp (32).
(g) Loosen the nut (16) from the union (27) and carefully disengage the NEA pipe (1).
(h) Loosen the nut (52) from the union (45) and carefully disengage the NEA pipe (1) from the NEA pipe (2).
(i) Remove the bolts (20), (37) and the washers (21), (36) and disconnect the clamps (24), (30) from the support brackets (25), (28).
(j) Put CAP - BLANKING at the ends of the disconnected pipe.
(2) To remove the NEA pipe (2):
(a) Remove the self-locking nuts (46) and the washers (47) from the clamps (50) and (51).
(b) Remove the screws (48) and the washers (49) and disconnect the bonding leads (44) from the clamps (50) and (51).
(c) Remove the self-locking nuts (86) and the washers (87) from the clamps (88) and (92).
(d) Remove the screws (84) and the washers (85) and disconnect the bonding leads (83) from the clamps (88) and (92).
(e) Loosen the nut (82) from the union (93) and carefully disengage the NEA pipe (2) from the NEA pipe (3).
(f) Remove the bolts (75), (90) and the washers (74), (89) and disconnect the clamps (73), (91) from the support brackets (72), (94).
(g) Put CAP - BLANKING at the ends of the disconnected pipe.
(3) To remove the NEA pipe (3):
(a) Remove the self-locking nuts (76) and the washers (77) from the clamps (80) and (81).
(b) Remove the screws (79) and the washers (78) and disconnect the bonding leads (83) from the clamps (80) and (81).
(c) Remove the self-locking nut (121) and the washer (120) from the clamp (119).
(d) Remove the screw (116) and the washer (117) and disconnect the bonding lead (118) from the clamp (119).
(e) Loosen the nut (126) from the union (125) and carefully disengage the NEA pipe (3) from the NEA flexible hose (4).
(f) Remove the bolt (122) and the washer (123) and disconnect the clamp (124) from the support bracket (115).
(g) Put CAP - BLANKING at the ends of the disconnected pipe.
(4) To remove the NEA flexible hose (4):
(a) Loosen the nut (127) and disconnect the flexible hose (4) from the elbow (128).
(b) Loosen the nut (129) and disconnect the elbow (128) from the dual-flapper check valve adapter (130).
(c) Put CAP - BLANKING at the ends of the disconnected pipe.

[Rev.10 from 2021] 2026.04.02 06:26:19 UTC