Removal of the Main Anti-ice Ducts

TASK 30-21-49-000-041-A
Removal of the Main Anti-ice Ducts

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	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, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 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-A	Opening of the Fan Cowl Doors
TASK 78-30-00-481-041-A	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-36-00-010-040-A	Opening of the Thrust Reverser Doors
Anti-ice Ducts
Anti-ice Ducts

3. Job Set-up
Subtask 30-21-49-861-060-A ** ON A/C NOT FOR ALL

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

Subtask 30-21-49-941-075-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 ENG section of the 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 system 1(2).

Subtask 30-21-49-010-092-A ** ON A/C NOT FOR ALL

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

Subtask 30-21-49-040-069-A ** ON A/C NOT FOR ALL

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

Subtask 30-21-49-010-097-A ** ON A/C NOT FOR ALL

E. Open the right thrust reverser cowl door (Ref. AMM TASK 78-36-00-010-040):
(1) FOR [1000EM1] (ENGINE-1)
452AR
(2) FOR [1000EM2] (ENGINE-2)
462AR

Subtask 30-21-49-865-067-A ** ON A/C NOT FOR ALL

F. 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

4. Procedure
Subtask 30-21-49-020-065-A ** ON A/C NOT FOR ALL

A. Removal of the Anti-ice Ducts
(1) Remove the bolts (55), the washers (60), and the nuts (65) that connect the support links to the bracket of the forward anti-ice duct (80).

Anti-ice Ducts ** ON A/C NOT FOR ALL

(2) Disconnect the hose (35) and the hose (10) from the tube (15).
(3) Remove the couplings (70) and the seals (75) that attach the forward anti-ice duct (80) to:
(a) the rear anti-ice duct (85),
(b) the anti-ice valve 4000DN (5).
(4) Remove the forward anti-ice duct (80) with the tube (15) attached to it.
(5) Remove the couplings (70) and the seal (75) that attach the rear anti-ice duct (85) to the upper anti-ice duct (90).

Anti-ice Ducts ** ON A/C NOT FOR ALL

(6) Discard the seal (75).
(7) Remove the bolts (95), the washers (100), and the nuts (105) that attach the flange of the rear anti-ice duct (85) to the fireshield.
(8) Remove the rear anti-ice duct (85) from the engine.
(9) Cut and remove the lockwire from the bolts (110).
(10) Remove the bolts (110) that attach the upper anti-ice duct (90) to the engine.
(11) Remove and discard the seal (115).
(12) Remove the upper anti-ice duct (90) from the engine.
(13) Put the PLUG-BLANKING in each disconnected line end.

[Rev.10 from 2021] 2026.04.01 00:29:20 UTC