Removal of the Nacelle Anti-Ice (NAI) Duct

TASK 30-21-49-000-807-A
Removal of the Nacelle Anti-Ice (NAI) Duct

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AND THE ADJACENT COMPONENTS AFTER ENGINE SHUTDOWN. THE ENGINE, THE ENGINE OIL AND THE ADJACENT COMPONENTS CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

WARNING: WEAR APPLICABLE PERSONAL PROTECTIVE EQUIPMENT (PPE) WHEN YOU DO THIS TASK. BEFORE YOU USE PPE, READ, UNDERSTAND AND OBEY ALL INSTRUCTIONS FOR ITS USE. THESE INSTRUCTIONS INCLUDE INSTRUCTIONS FROM THE MANUFACTURER, YOUR EMPLOYER AND GOVERNMENT REGULATIONS. YOU CAN GET INJURED IF YOU DO NOT USE PPE. GET INSTRUCTIONS FROM YOUR EMPLOYER ON WHICH PPE IS NECESSARY.

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

ZONE: 210
ZONE: 400

1. Reason for the Job

NOTE: The NAI duct is an interchangeable part. For the same duct, there are different part numbers with different conditions (form and color). The different part numbers stay fully interchangeable.

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	COVER - PROTECTION
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.PU10-0007)	Scraper, Non-metallic, U10-0007

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD
400	POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL, 462AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 30-21-12-000-801-A	Removal of the Nacelle Anti-Ice Sense-Tubes
TASK 30-21-51-000-802-A	Removal of the Upper Anti-Ice Valve
TASK 30-21-51-000-803-A	Removal of the Lower Anti-Ice Valve
TASK 36-11-49-000-822-A	Removal of the Environmental Control System (ECS) Ducts
TASK 36-11-52-000-802-A	Removal of the Bleed Pressure-Regulator Valve
TASK 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
TASK 71-71-49-000-801-A	Removal of the Engine Drain Tubes and Pylon Drain Hoses
TASK 72-21-11-000-801-A	Removal of the Lower BiFi
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
Nacelle Anti-Ice (NAI) Duct

3. Job Set-up
Subtask 30-21-49-861-086-A ** ON A/C NOT FOR ALL

A. Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 30-21-49-941-112-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).

Subtask 30-21-49-865-114-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
FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENG 1)
122VU	ANTI ICE/ENG/1	1DN1	X10
FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENG 2)
122VU	ANTI ICE/ENG/2	1DN2	W10

Subtask 30-21-49-010-155-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR

Subtask 30-21-49-040-093-A ** ON A/C NOT FOR ALL

E. Deactivation of the Thrust Reverser System for Ground Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Do the deactivation of the thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 30-21-49-010-156-A ** ON A/C NOT FOR ALL

F. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.

4. Procedure

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.

CAUTION: WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.

CAUTION: REMOVE AND INSTALL PROTECTION COVERS AS NECESSARY TO PREVENT DAMAGE TO THE ENGINE AND ADJACENT COMPONENTS.

CAUTION: BE CAREFUL WHEN YOU REMOVE THE INSULATION COVERS. DAMAGED, TORN OR RIPPED COVERS DO NOT GIVE CORRECT INSULATION AND MUST BE REPLACED.

Subtask 30-21-49-020-093-A ** ON A/C NOT FOR ALL

A. Removal of the Nacelle Anti-Ice (NAI) Ducts

NOTE: As necessary, remove the sealant from the insulation covers and adjacent surfaces with a PU10-0007Scraper, Non-metallic, U10-0007. Do not cause damage to the insulation covers or adjacent surfaces when you remove the sealant.

(1) Remove the Nacelle Anti-Ice (NAI) sense tubes (Ref. AMM TASK 30-21-12-000-801).
(2) If necessary, remove the ECS starter duct, pressure regulating valve and ECS mid-Y duct to gain access (Ref. AMM TASK 36-11-52-000-802) and (Ref. AMM TASK 36-11-49-000-822).
(3) Remove the aft NAI duct (1):
(a) Remove the ECS link assembly from the aft NAI duct (1) (Ref. AMM TASK 36-11-49-000-822).
(b) Cut and remove the safety cable from the two bolts (2). Discard the safety cable.
(c) Cut and remove the safety cable from the bolt (2) and the bolt on the ECS duct. Discard the safety cable.
(d) Remove the three bolts (2) and three washers (3) that attach the aft NAI duct (1) to the engine case.
(e) Remove the V-retainer coupling (12) that attaches the upper anti-ice valve to the aft NAI duct (1) (Ref. AMM TASK 30-21-51-000-802).
(f) Remove the three bolts (5), six washers (6), three bushings (7) and three nuts (8) that attach the aft NAI duct (1) to the three link assemblies (9), (10) and (11).
(g) Remove the aft NAI duct (1) from the engine.
(h) Remove the seal (4) from the aft NAI duct (1).
(i) Remove the seal (13) from the upper anti-ice valve.
(4) Remove the upper anti-ice valve from the short NAI duct (14) (Ref. AMM TASK 30-21-51-000-802):
(a) Remove the V-retainer coupling (12) that attaches the upper anti-ice valve to the short NAI duct (14).
(b) Remove the upper anti-ice valve from the short NAI duct (14).
(c) Remove the seal (13) from the upper anti-ice valve.
(5) Remove the short NAI duct (14):
(a) Remove the bolt (5), two washers (6), bushing (7) and nut (8) that attach the short NAI duct (14) to the link assembly (11).
(b) Remove the V-retainer coupling (12) that attaches the short NAI duct (14) to the lower anti-ice valve.
(c) Remove the short NAI duct (14) from the engine.
(d) Remove the seal (13) from the lower anti-ice valve.
(6) Remove the lower anti-ice valve from the middle NAI duct (15) (Ref. AMM TASK 30-21-51-000-803):
(a) Remove the V-retainer coupling (12) that attaches the lower anti-ice valve to the middle NAI duct (15).
(b) Remove the lower anti-ice valve from the middle NAI duct (15).
(c) Remove the seal (13) from the lower anti-ice valve.
(7) Remove the middle NAI duct (15):
(a) Remove the ignition cables from the middle NAI duct (15) spring clips.
(b) Remove the four bolts (20), eight washers (19), four spacers (21) and four nuts (22) that attach the igniter cable bracket (18) and NAI bumper plate (23) to the middle NAI duct (15).
(c) Remove the igniter cable bracket (18) from the middle NAI duct (15).
(d) Cut the safety cable on the insulation cover (28).
(e) Remove the two clamps (27) and insulation cover (28) from the middle NAI duct (15) and forward NAI duct (26).
(f) Remove the V-retainer coupling (24) that connects the middle NAI duct (15) to the forward NAI duct (26).
(g) For Configuration 1, do the following:
1 Remove the two bolts (5), four washers (6), two bushings (7) and two nuts (8) that attach the middle NAI duct (15) to the two link assemblies (16).
(h) For Configuration 2, do the following:
1 Cut the safety cable on the two link assemblies (52) on the middle NAI duct (15).
2 Remove the two bolts (5), four washers (6), two bushings (7) and two nuts (8) that attach the middle NAI duct (15) to the two link assemblies (52).
(i) Remove the middle NAI duct (15) from the engine.
(j) Remove the seal (25) from the middle NAI duct (15).
(8) Remove the forward NAI duct (26):
(a) Remove the insulation covers:
1 Cut the safety cable on the insulation covers (32), (34), (38) or (53), (40) and (41).
2 Loosen the two clamps and remove the insulation cover (31) from the forward NAI duct (26).
3 Remove the clamp (33), clamp (46) and clamp (51) that attach the insulation cover (32) to the forward NAI duct (26).
4 Remove the clamp (33) that attaches the insulation cover (34) to the forward NAI duct (26).
5 Disconnect the wire harnesses from the spring clips on the B-flange bracket (50) adjacent to the link assembly (16) attached to the forward NAI duct (26).
6 Remove the two bolts (49), washers (47) and nuts (48) that attach the B-flange bracket (50) to flange B. Remove the B-flange bracket (50).

NOTE: You must remove the B-flange bracket (50) to have sufficient clearance to remove the insulation cover (34).

7 Remove the insulation covers (32) and (34) and the grommet on the cover (32) from the forward NAI duct (26).
8 Temporarily install the B-flange bracket (50):
a Install the B-flange bracket (50) to flange B with the two bolts (49), two washers (47) and two nuts (48). Make sure the bolts go through the holes in the adjacent brackets.

NOTE: Do not torque the nuts for the B-flange bracket (50) at this time.

b Attach the wire harnesses to the spring clips on the B-flange bracket (50).
9 Remove the two clamps (33) and clamp (46) that attach the insulation cover (38) or (53) to the forward NAI duct (26).
10 Remove the insulation cover (38) or (53) and its grommets from the forward NAI duct (26).
11 For PRE SB GRAA320NEO-A-30-21-0001-00001-930A-D, do the following:
a Remove the two clamps (46), two clamps (45) and clamp (35) that attach the insulation cover (40) to the forward NAI duct (26).
12 For POST SB GRAA320NEO-A-30-21-0001-00001-930A-D, do the following:
a Remove the clamp (46), two clamps (45) and clamp (35) that attach the insulation cover (40) to the forward NAI duct (26).
13 Remove the insulation cover (40) and its grommets from the forward NAI duct (26).
14 Loosen the clamp and remove the insulation cover (41) from the forward NAI duct (26) and inlet cowl.
(b) Disconnect the XDCR2 sense tube from the forward NAI duct (26) (Ref. AMM TASK 30-21-12-000-801).
(c) Remove the two bolts (5), four washers (6), two bushings (7) and two nuts (8) that attach the forward NAI duct (26) to the link assemblies (10) and (42).
(d) Remove the bolt (5), two washers (6), bushing (7) and nut (8) that attach the forward NAI duct (26) to the link assembly (39).
(e) Remove the bolt (5), two washers (6), bushing (7) and nut (8) that attach the forward NAI duct (26) to the link assembly (36).
(f) Remove the bolt (5), two washers (6), bushing (7) and nut (8) that attach the forward NAI duct (26) to the link assembly (16).
(g) Remove the three bolts (29) and three washers (30) that attach the forward NAI duct (26) to the lower bifurcation firewall.
(h) Remove the lower bifurcation firewall (Ref. AMM TASK 72-21-11-000-801).
(i) Remove the V-retainer coupling (44) that connects the forward NAI duct (26) to the inlet cowl anti-ice duct.
(j) Remove the seal (43) from the forward NAI duct (26).
(9) If necessary, remove the link assemblies:
(a) Remove the five link assemblies (9), (10) and (11):
1 Remove the five bolts (5), ten washers (6), five bushings (7) and five nuts (8) that attach the five link assemblies (9), (10) and (11) to the brackets on the engine case.
2 Remove the five link assemblies (9), (10) and (11) from the engine.
(b) Remove the two link assemblies (16) or (52):
1 Remove the two bolts (17), four washers (6), two bushings (7) and two nuts (8) that attach the two link assemblies (16) or (52) to the brackets on the engine case.
2 Remove the two link assemblies (16) or (52) from the engine.
(c) Remove the link assembly (16):
1 Remove the bolt (37), two washers (6), bushing (7) and nut (8) that attach the link assembly(16) to the bracket on the fan case.
2 Remove the link assembly (16) from the engine.
(d) Remove the link assembly (36):
1 Remove the bolt (5), two washers (6), bushing (7) and nut (8) that attach the link assembly (36) to the bracket on the fan case.
2 Remove the link assembly (36) from the engine.
(e) Remove the link assembly (39):
1 Remove the bolt (5), two washers (6), bushing (7) and nut (8) that attach the link assembly (39) to the bracket on the fan case.
2 Remove the link assembly (39) from the engine.
(f) Remove the link assembly (42):
1 Remove the bolt (5), two washers (6), bushing (7) and nut (8) that attach the link assembly (42) to the bracket on the fan case.
2 Remove the link assembly (42) from the engine.
(10) If necessary, remove the NAI bumper plate (23) (Ref. AMM TASK 71-71-49-000-801):
(a) Remove the four bolts (20), eight washers (19), four spacers (21) and four nuts (22) that attach the NAI bumper plate (23) to the two middle clamp-block brackets.
(b) Remove the NAI bumper plate (23).
(c) Install the four bolts (20), eight washers (19), four spacers (21) and four nuts (22) back on the two middle clamp-block brackets.

NOTE: Do not torque the nuts (22) at this time.

(11) Installation of the protection covers:

CAUTION: INSTALL PROTECTION COVERS ON ALL THE OPENINGS IMMEDIATELY TO PREVENT DAMAGE TO THE ENGINE.

(a) Make sure that you install COVER - PROTECTION as necessary to prevent damage to the engine.

[Rev.10 from 2021] 2026.04.01 00:29:48 UTC