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

TASK 47-20-49-400-805-A
Installation 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.

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
No specific	Torque wrench: range to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in )
No specific	Torque wrench: range to between 5.3 and 5.2 m.daN (39.09 and 38.35 lbf.ft )
No specific	Torque wrench: range to between 6.2 and 5.2 m.daN (45.72 and 38.35 lbf.ft )
No specific	Torque wrench: range to between 7.40 and 7.29 m.daN (54.57 and 53.76 lbf.ft )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.04TMB2)	Varnish-- Electrical Bonding Structure

C. Work Zones and Access Panels

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

D. Referenced Information

REFERENCE	DESIGNATION
TASK 20-21-11-911-001-A	Tightening Torques for Standard Threaded Fasteners
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
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 25-54-12-400-001-A	Installation of the Forward Cargo-Compartment Partition
TASK 53-32-12-000-002-A	Removal of the Cabin Floor Panels
TASK 53-32-12-400-002-A	Installation 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 47-20-49-941-057-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 47-20-49-860-059-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 47-20-49-865-059-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 47-20-49-010-057-A ** ON A/C NOT FOR ALL

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

4. Procedure
Subtask 47-20-49-420-052-A ** ON A/C NOT FOR ALL

A. Installation of the NEA line

NOTE: Two persons are necessary to do this procedure.

(1) To install the Flexible NEA Hose (4):
(a) Remove CAP - BLANKING from the disconnected pipe ends.
(b) Install the elbow (128) on the dual-flapper check valve adapter (130) and tighten the nut (129).
(c) TORQUE the nut (129) to between 7.40 and 7.29 m.daN (54.57 and 53.76 lbf.ft )

.
(d) Make sure that the flexible NEA hose (4) is free from damage.
(e) Install the flexible NEA hose (4) on the elbow (128) and tighten the nut (127).
(f) TORQUE the nut (127) to between 5.3 and 5.2 m.daN (39.09 and 38.35 lbf.ft )

.
(2) To install the NEA pipe (3):
(a) Remove CAP - BLANKING from the disconnected pipe ends.
(b) Install the clamp (124) on the support brackets (115) with the bolts (122) and the washers (123).
(c) Tighten the bolts (122) (Ref. AMM TASK 20-21-11-911-001).
(d) Install the flexible NEA hose (4) on the union (125) and tighten the nut (126).

NOTE: The clearance between the hose (4) and the surrounding structure and systems must not be less than 25 mm (0.984 in.).

(e) TORQUE the nut (126) to between 5.3 and 5.2 m.daN (39.09 and 38.35 lbf.ft )

.
(f) Attach the bonding lead (118) to the clamp (119) with the screw (116) and the washer (117) (Ref. AMM TASK 20-28-00-912-802).
(g) Install the washer (120) and the self-locking nut (121) on the clamp (119).
(h) TORQUE the self-locking nut (121) to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in )

.
(i) Apply Varnish-- Electrical Bonding Structure (Material No.04TMB2) on the screw (116) and the self-locking nut (121).
(j) Attach the bonding leads (83) to the clamps (80), (81) with the screws (79) and the washers (78) (Ref. AMM TASK 20-28-00-912-802).
(k) Install the washers (77) and the self-locking nuts (76) on the clamps (80) and (81).
(l) TORQUE the self-locking nuts (76) to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in )

.
(m) Apply Varnish-- Electrical Bonding Structure (Material No.04TMB2) on the screws (79) and the self-locking nuts (76).
(3) To install the NEA pipe (2):
(a) Remove CAP - BLANKING from the disconnected pipe ends.
(b) Install the clamps (73), (91) on the support brackets (72), (94) with the bolts (75), (90) and the washers (74), (89).
(c) Tighten the bolts (90) and (75) (Ref. AMM TASK 20-21-11-911-001).

NOTE: The distance between the NEA pipe (2) and the trim air regulating valves must not be less than 50 mm (1.969 in.).

(d) Install the NEA pipe (3) on the union (93) and tighten the nut (82).
(e) TORQUE the nut (82) to between 6.2 and 5.2 m.daN (45.72 and 38.35 lbf.ft )

.
(f) Attach the bonding leads (83) to the clamps (88), (92) with the screws (84) and the washers (85) (Ref. AMM TASK 20-28-00-912-802).
(g) Install the washers (87) and the self-locking nuts (86) on the clamps (88) and (92).
(h) TORQUE the self-locking nuts (86) to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in )

.
(i) Apply Varnish-- Electrical Bonding Structure (Material No.04TMB2) on the screws (84) and the self-locking nuts (86).
(j) Attach the bonding leads (44) to the clamps (50), (51) with the screws (48) and the washers (49) (Ref. AMM TASK 20-28-00-912-802).
(k) Install the washers (47) and the self-locking nuts (46) on the clamps (50) and (51).
(l) TORQUE the self-locking nuts (46) to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in )

.
(m) Apply Varnish-- Electrical Bonding Structure (Material No.04TMB2) on the screws (48) and the self-locking nuts (46).
(4) To install the NEA pipe (1):
(a) Remove CAP - BLANKING from the disconnected pipe ends.
(b) Install the clamps (30), (24) on the support brackets (28), (25) with the bolts (37), (20) and the washers (36), (21).
(c) Tighten the bolts (37) and (20) (Ref. AMM TASK 20-21-11-911-001).
(d) Install the NEA pipe (2) on the union (45) and tighten the nut (52).
(e) TORQUE the nut (52) to between 6.2 and 5.2 m.daN (45.72 and 38.35 lbf.ft )

.
(f) Install NEA pipe (1) on the union (27) and tighten the nut (16).
(g) TORQUE the nut (16) to between 6.2 and 5.2 m.daN (45.72 and 38.35 lbf.ft )

.
(h) Attach the bonding leads (44) to the clamps (40), (43) with the screws (41) and the washers (42) (Ref. AMM TASK 20-28-00-912-802).
(i) Install the washers (39) and the self-locking nuts (38) on the clamps (40) and (43).
(j) TORQUE the self-locking nuts (38) to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in )

.
(k) Apply Varnish-- Electrical Bonding Structure (Material No.04TMB2) on the screws (41) and the self-locking nuts (38).
(l) Attach the bonding lead (35) to the clamp (32) with the screw (34) and the washer (33) (Ref. AMM TASK 20-28-00-912-802).
(m) Install the washer (31) and the self-locking nut (29) on the clamp (32).
(n) TORQUE the self-locking nut (29) to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in )

.
(o) Apply Varnish-- Electrical Bonding Structure (Material No.04TMB2) on the screw (34) and the self-locking nut (29).
(p) Attach the bonding leads (15) to the clamps (17), (26) with the screws (22) and the washers (23) (Ref. AMM TASK 20-28-00-912-802).
(q) Install the washers (18) and the self-locking nuts (19) on the clamps (17) and (26).
(r) TORQUE the self-locking nuts (19) to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in )

.
(s) Apply Varnish-- Electrical Bonding Structure (Material No.04TMB2) on the screws (22) and the self-locking nuts (19).
(5) Do a check of the bonding (Ref. AMM TASK 20-28-00-912-802).

Subtask 47-20-49-865-060-A ** ON A/C NOT FOR ALL

B. 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	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

5. Close-up
Subtask 47-20-49-410-052-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the cabin-floor access panels (Ref. AMM TASK 53-32-12-400-002) (Ref. AMM D/O 06-41-53-00).
(3) Install the forward cargo-compartment partition-panels (Ref. AMM TASK 25-54-12-400-001) (Ref. AMM D/O 06-41-53-00).

Subtask 47-20-49-942-052-A ** ON A/C NOT FOR ALL

B. Removal of Equipment
(1) Remove the SAFETY BARRIER(S).
(2) Remove all the fixtures, tools, test and support equipments used during this procedure.

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