Removal of the Nacelle Anti-Ice Sense-Tubes

TASK 30-21-12-000-801-A
Removal of the Nacelle Anti-Ice Sense-Tubes

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.

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	COVER - PROTECTION
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. 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

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 30-21-49-000-807-A	Removal of the Nacelle Anti-Ice (NAI) Duct
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 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 Sense-Tubes

3. Job Set-up
Subtask 30-21-12-861-050-A ** ON A/C NOT FOR ALL

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

Subtask 30-21-12-941-050-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 30-21-12-865-050-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 30-21-12-010-050-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
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.

Subtask 30-21-12-040-050-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 30-21-12-010-051-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

4. Procedure

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

Subtask 30-21-12-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the Nacelle Anti-Ice Sense-Tubes

CAUTION: YOU MUST USE A WRENCH TO HOLD THE MATING PARTS WHEN YOU LOOSEN OR TIGHTEN THE TUBE NUTS. IF YOU DO NOT OBEY THIS CAUTION, YOU CAN TWIST OR CAUSE DAMAGE TO THE TUBES.

(1) Remove the forward sense tubes (1), (2) and (3).
(a) Remove the nut (7), the two washers (5) and bolt (4) that attach the three clamps (6), the forward valve 1 sense tube (1), the forward valve 2 sense tube (2) and the forward XDCR1 sense tube (3) to the bracket.
(b) Disconnect the forward valve 1 sense tube (1) from the solenoid manifold.
(c) Disconnect the forward valve 1 sense tube (1) from the union (10) on the ECS duct.
(d) Remove the forward valve 1 sense tube (1) from the engine.
(e) Remove the clamp (6) from the forward valve 1 sense tube (1).
(f) Disconnect the forward valve 2 sense tube (2) from the solenoid manifold.
(g) Disconnect the forward valve 2 sense tube (2) from the union (10) on the ECS duct.
(h) Remove the forward valve 2 sense tube (2) from the engine.
(i) Remove the clamp (6) from the forward valve 2 sense tube (2).
(j) Disconnect the forward XDCR1 sense tube (3) from the pressure transducer.
(k) Disconnect the forward XDCR1 sense tube (3) from the union (10) on the ECS duct.
(l) Remove the forward XDCR1 sense tube (3) from the engine.
(m) Remove the clamp (6) from the XDCR1 sense tube (3).
(2) Remove the middle sense tubes (11), (12) and (13).
(a) Remove the bolt (14) and washer (15) that attach the two clamps (16), the middle valve 1 sense tube (11) and the middle valve 2 sense tube (12) to the nacelle anti-ice duct.
(b) Disconnect the middle valve 1 sense tube (11) from the union (10) on ECS duct.
(c) Disconnect the middle valve 1 sense tube (11) from the nacelle anti-ice duct.
(d) Remove the middle valve 1 sense tube (11) from the engine.
(e) Remove the clamp (16) from the middle valve 1 sense tube (11).
(f) Disconnect the middle valve 2 sense tube (12) from the union (10) on ECS duct.
(g) Disconnect the middle valve 2 sense tube (12) from the nacelle anti-ice duct.
(h) Remove the middle valve 2 sense tube (12) from the engine.
(i) Remove the clamp (16) from the middle valve 2 sense tube (12).
(j) Remove the nut (18), the two washers (19) and bolt (20) that attach the clamp (16) and the middle XDCR1 sense tube (13) to the nacelle anti-ice duct.
(k) Disconnect the middle XDCR1 sense tube (13) from the union (10) on the ECS duct.
(l) Disconnect the middle XDCR1 sense tube (13) from the nacelle anti-ice duct.
(m) Remove the middle XDCR1 sense tube (13) from the engine.
(n) Remove the clamp (16) from the middle XDCR1 sense tube (13).
(3) Remove the aft sense tubes (21) and (22).
(a) Remove the nut (24), the two washers (23) and bolt (26) that attach the two clamps (25), the aft valve 1 sense tube (21) and the aft valve 2 sense tube (22) to the nacelle anti-ice duct.
(b) Disconnect the aft valve 1 sense tube (21) from the nacelle anti-ice duct.
(c) Disconnect the aft valve 1 sense tube (21) from the upper anti-ice valve.
(d) Remove the aft valve 1 sense tube (21) from the engine.
(e) Remove the clamp (25) from the aft valve 1 sense tube (21).
(f) Disconnect the aft valve 2 sense tube (22) from the nacelle anti-ice duct.
(g) Disconnect the aft valve 2 sense tube (22) from the lower anti-ice valve.
(h) Remove the aft valve 2 sense tube (22) from the engine.
(i) Remove the clamp (25) from the aft valve 2 sense tube (22).
(4) Remove the XDCR2 sense tube (30).
(a) Remove the insulation covers from the nacelle anti-ice duct (Ref. AMM TASK 30-21-49-000-807).
(b) Remove the bolt (29) and washer (28) that attach the clamp (27) and the XDCR2 sense tube (30) to the engine case bracket.
(c) Disconnect the XDCR2 sense tube (30) from the pressure transducer.
(d) Disconnect the XDCR2 sense tube (30) from the nacelle anti-ice duct.
(e) Remove the XDCR2 sense tube (30) from the engine.
(f) Remove the clamp (27) from the XDCR2 sense tube (30).
(5) If necessary, remove the unions (10).
(a) Remove the three nuts (8), the three washers (9) and the three unions (10) from the ECS duct.
(6) 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 00:29:07 UTC