Removal of the Forward Anti-ice Duct

TASK 30-21-49-000-044-A
Removal of the Forward Anti-ice Duct

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	ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE
No specific	AR	COVER - PROTECTION
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-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 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 78-30-00-481-041-B	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-36-00-010-040-B	Opening of the Thrust Reverser Doors
Anti-ice Ducts

3. Job Set-up
Subtask 30-21-49-861-056-A ** ON A/C NOT FOR ALL

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

Subtask 30-21-49-941-053-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).

Subtask 30-21-49-865-055-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
122VU	ANTI ICE/ENG/2	1DN2	W10
122VU	ANTI ICE/ENG/1	1DN1	X10

Subtask 30-21-49-010-054-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
438AR 437AL
(b) FOR [1000EM2] (ENGINE-2)
448AR 447AL
(2) Put the ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position.

Subtask 30-21-49-040-053-A ** ON A/C NOT FOR ALL

E. Make the thrust reverser unserviceable (Ref. AMM TASK 78-30-00-481-041).

Subtask 30-21-49-010-058-A ** ON A/C NOT FOR ALL

F. Open the thrust reverser cowl doors (Ref. AMM TASK 78-36-00-010-040):
(1) FOR [1000EM1] (ENGINE-1)
452AR 451AL
(2) FOR [1000EM2] (ENGINE-2)
462AR 461AL

4. Procedure
Subtask 30-21-49-020-051-A ** ON A/C NOT FOR ALL

A. Removal of the Forward Anti-ice Duct
(1) Remove the forward muscle pressure tube (20) from the forward anti-ice duct (65).
(a) Disconnect the forward hose (40) from the tube (20).
(b) Disconnect the aft hose (5) from the tube (20).
(c) Remove the bulkhead nut (10) and washer (15) from the tube (20).

NOTE: Use a second wrench to hold the fittings on the tube (20) when you loosen the coupling nuts on the hoses and when you loosen the bulkhead nut.

(d) Remove the bolts (25), washers (30), and nuts (35) that attach the tube (20) to the forward anti-ice duct (65). Let the clamps (45) stay on the tube (20).
(e) Remove the tube (20) from the anti-ice duct (65).
(2) Remove the coupling (60) that connects the forward anti-ice duct (65) to the anti-ice valve (4000DN). Keep the seal (55) to use again if it is serviceable.
(3) Remove the coupling (60) that connects the forward anti-ice duct (65) to the mid anti-ice duct (90). Keep the seal (55) to use again if it is serviceable.
(4) Remove the bolts (70), the washers (75), and the nuts (85) that attach the forward anti-ice duct (65) to the support links (80).
(5) Remove the forward anti-ice duct (65) from the engine.
(6) Put PLUG - BLANKING on the disconnected ducts, and the anti-ice valve.
(7) Put COVER - PROTECTION on the hoses and the two ends of the muscle pressure tube.

[Rev.10 from 2021] 2026.04.01 00:29:25 UTC