Removal of the Engine Air-Intake Anti-ice Valve

TASK 30-21-51-000-041-A
Removal of the Engine Air-Intake Anti-ice Valve

ZONE: 410
FIN: 4000DN ** ON A/C NOT FOR ALL

1. Reason for the Job

NOTE: The removal of the air intake anti-ice valve is the same for the engine 1 and the engine 2.

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
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
410	ENG 1 PYLON BOX AND FORWARD FAIRING
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR

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
Engine Air-Intake Anti-ice Valve (4000DN)

3. Job Set-up
Subtask 30-21-51-861-059-A ** ON A/C NOT FOR ALL

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

Subtask 30-21-51-941-051-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 30-21-51-865-052-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 30-21-51-010-051-A ** ON A/C NOT FOR ALL

D. Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR

4. Procedure
Subtask 30-21-51-020-051-A ** ON A/C NOT FOR ALL

A. Removal of the Engine Air Intake Anti-ice Valve
(1) Disconnect the electrical connector 4000DN-A from the anti-ice valve (15).
(2) Disconnect the muscle pressure hose (20) from the anti-ice valve (15).

NOTE: Use a second wrench to hold the union on the anti-ice valve when you loosen the hose coupling nut.

(3) Remove the couplings (10) and seals (5) that connect the valve (15) to the ducts.
(4) Remove the anti-ice valve (15) from the engine.
(5) Put PLUG - BLANKING on the forward duct and air intake cowl anti-ice duct.
(6) Put PLUG - BLANKING on the two open ends of the anti-ice valve (15).
(7) Put COVER - PROTECTION on the electrical connectors on the harness and on the valve.
(8) Put COVER - PROTECTION on the muscle pressure hose coupling and the union on the valve.

[Rev.10 from 2021] 2026.04.01 04:09:57 UTC