Removal of the Secondary Anti-ice Ducts

TASK 30-21-49-000-040-A
Removal of the Secondary 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	1	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 30-21-49-861-059-A ** ON A/C NOT FOR ALL

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

Subtask 30-21-49-941-076-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 30-21-49-010-091-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 30-21-49-040-066-A ** ON A/C NOT FOR ALL

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

Subtask 30-21-49-010-094-A ** ON A/C NOT FOR ALL

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

Subtask 30-21-49-865-064-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 30-21-49-020-064-A ** ON A/C NOT FOR ALL

A. Removal of the Anti-ice Ducts
(1) Disconnect the hose (10) from the tube (15) and from the engine air intake anti-ice valve 4000DN (5).

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

NOTE: Use a second wrench to hold the union on the valve and the fitting on the tube when you loosen the coupling nuts on the hose.

(2) Remove the hose (10) from the engine.
(3) Disconnect the hose (35) from the tube (15).

NOTE: Use a second wrench to hold the fitting on the tube when you loosen the coupling nut on the hose.

(4) 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).
(5) Remove the couplings (70) and the seals (75) that attach the forward anti-ice duct (80) to the rear anti-ice duct (85) and to the anti-ice valve 4000DN (5).
(6) Remove the forward anti-ice duct (80), with the tube (15) attached, from the engine.
(7) Remove the nut (120) and the washer (125) that attach the tube (15) to the support bracket of the forward anti-ice duct (80).
(8) Remove the bolts (20), the washers (25), and the nuts (30) from the lugs on the forward anti-ice duct (80).
(9) Remove the tube (15) from the forward anti-ice duct (80).
(10) Disconnect the hose (35) from the tube (40).

NOTE: Use a second wrench to hold the fitting on the tube when you loosen the coupling nut on the hose.

(11) Remove the hose (35) from the engine.
(12) Remove the bolts (20), the washers (25), the nuts (30), and the clamps (45) that attach the tube (40) to the engine brackets and the tube fairlead.
(13) Disconnect the coupling of the tube (40) from the union.

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

NOTE: Use a second wrench to hold the union on the fireshield when you loosen the coupling nut on the tube.

(14) Remove the tube (40) from the engine.
(15) Disconnect the tube (50) from the union and the lower high-pressure manifold duct

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

NOTE: Use a second wrench to hold the union on the fireshield and the union on the pneumatic duct when you loosen the coupling nuts on the tube.

(16) Remove the tube (50) from the engine.
(17) Install the PLUG - BLANKING on the ducts, the hose, and tube assemblies, and the open engine port.

[Rev.10 from 2021] 2026.04.01 00:29:19 UTC