Inspection and Cleaning of the Nacelle Anti-Icing (NAI) Duct Sense-Line Tap

TASK 30-21-49-200-807-A
Inspection and Cleaning of the Nacelle Anti-Icing (NAI) Duct Sense-Line Tap

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE 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.

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	SAFETY CLIP - CIRCUIT BREAKER
No specific	Torque wrench: range to between 77 and 70 lbf.in (0.870 and 0.791 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.PU1-0001)	lint-free cotton cloth
(Material No.PU2-0002)	Acetone
(Material No.PU3-0025)	Sealant, Tamper Proof
(Material No.PU5-0003)	Anti-Seize Compound
(Material No.14QEB1)	Wire-Locking Dia: 0.6 mm CRES Nickel Alloy -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL, 462AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
2	SEAL	AIPC 30-21-86-01-615

E. Referenced Information

REFERENCE	DESIGNATION
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 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 71-13-00-410-802-A	Closing of the Fan Cowl Doors
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-805-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
TASK 78-36-00-410-802-A	Closing of the Thrust Reverser Cowl-Doors
NAI-Duct Sense-Line Bolt

3. Job Set-up
Subtask 30-21-49-861-096-A ** ON A/C NOT FOR ALL

A. Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).

Subtask 30-21-49-941-121-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 30-21-49-865-130-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 30-21-49-010-177-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 and 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL and 448AR.

Subtask 30-21-49-040-103-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 30-21-49-010-178-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 and 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL and 462AR.
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.

4. Procedure

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

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

Subtask 30-21-49-020-098-A ** ON A/C NOT FOR ALL

A. Removal of the NAI-Duct Sense-Line Bolts
(1) Remove the bolts (1) and the seals (2) from the NAI duct.
(2) Discard the seals (2).

Subtask 30-21-49-280-050-A ** ON A/C NOT FOR ALL

B. Do an inspection of the NAI-duct sense-line tap for blockage with a 14QEB1Wire-Locking Dia: 0.6 mm CRES Nickel Alloy - or an equivalent.

Subtask 30-21-49-160-050-A ** ON A/C NOT FOR ALL

C. If you find blockage, use the same 14QEB1Wire-Locking Dia: 0.6 mm CRES Nickel Alloy - or an equivalent to remove the unwanted debris or the anti-seize compound in the NAI-duct sense-line tap.

Subtask 30-21-49-420-099-A ** ON A/C NOT FOR ALL

D. Installation of the NAI-Duct Sense-Line Bolts

CAUTION: DO NOT APPLY ANTI-SEIZE COMPOUND TO THE END FACE OF THE BOLT. REMOVE UNWANTED ANTI-SEIZE COMPOUND. MAKE SURE THAT THE ANTI-SEIZE COMPOUND DOES NOT GO INTO THE SENSE LINES OR BLOCK THEM. IF YOU DO NOT OBEY THESE INSTRUCTIONS, INCORRECT OPERATION OF THE ANTI-ICE SYSTEM CAN OCCUR.

(1) If necessary, carefully apply the Anti-Seize Compound (Material No.PU5-0003) to the threads of the bolts (1) and the fitting threads of the NAI duct. Do not get the lubricant into the sense lines.
(2) Put the new AIPC 30-21-86-01-615 SEAL (2) into the NAI duct fitting. Make sure that the seals (2) are against the bottom of the NAI duct fittings.
(3) Install the bolts (1) on the NAI duct.
(4) TORQUE the bolts (1) to between 77 and 70 lbf.in (0.870 and 0.791 m.daN )

.
(5) Clean the surfaces of the bolts (1) and the adjacent surfaces with a clean lint-free cotton cloth (Material No.PU1-0001) and Acetone (Material No.PU2-0002) until you remove all the contamination.
(6) Clean the surfaces of the bolts (1) and the adjacent surfaces again with a clean lint-free cotton cloth (Material No.PU1-0001) and Acetone (Material No.PU2-0002) . Remove the solvent with a clean lint-free cotton cloth (Material No.PU1-0001) before the solvent dries.
(7) Clean the surfaces of the bolts (1) and the adjacent surfaces again with a clean lint-free cotton cloth (Material No.PU1-0001) .
(8) Apply a torque stripe on the bolts (1) and the adjacent surface with the PU3-0025Sealant, Tamper Proof.

5. Close-up
Subtask 30-21-49-410-147-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) Remove the access platform(s).
(3) Close the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL and 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL and 462AR.

Subtask 30-21-49-440-084-A ** ON A/C NOT FOR ALL

B. Do the reactivation of the thrust reverser system after ground maintenance (Ref. AMM TASK 78-30-00-440-805).

Subtask 30-21-49-410-148-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL and 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL and 448AR.

Subtask 30-21-49-865-131-A ** ON A/C NOT FOR ALL

D. 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
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 30-21-49-862-078-A ** ON A/C NOT FOR ALL

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

[Rev.10 from 2021] 2026.04.01 08:18:37 UTC