Removal of the Engine Air Intake Anti-ice Valve

TASK 30-21-51-000-010-B
Removal of the Engine Air Intake Anti-ice Valve

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

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

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	CAP - BLANKING
No specific	AR	COVER - PROTECTION
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
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 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
Anti-ice Valve 4000DN

3. Job Set-up
Subtask 30-21-51-861-055-A ** ON A/C NOT FOR ALL

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

Subtask 30-21-51-941-053-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) On the ENG panel 115VU located on the center pedestal:
(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 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 30-21-51-865-059-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 30-21-51-010-054-A ** ON A/C NOT FOR ALL

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

4. Procedure
Subtask 30-21-51-020-065-A ** ON A/C NOT FOR ALL

A. Removal of the Insulations from around the Anti-ice Valve and Couplings

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

(1) Remove the insulations around the anti-ice couplings (3) and (5).
(2) Remove the insulation (9) around the anti-ice valve (4).

Subtask 30-21-51-020-053-A ** ON A/C NOT FOR ALL

B. Removal of the Engine Air Intake Anti-ice Valve
(1) Remove the electrical connector 4000DN-A (1) from the anti-ice valve (4).
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(3) Remove the two anti-ice couplings (3) and (5).
(4) Loosen the duct coupling at the cowl bulkhead.
(5) Make a note of the direction of the flow arrow on the valve body. It must be in the same position on installation.
(6) Remove the anti-ice valve (4).
(7) Remove the two seals (2) and (6).
(8) Put COVER - PROTECTION on the open duct ends, the anti-ice valve (4), the electrical connector and the electrical receptacle.

[Rev.10 from 2021] 2026.04.01 04:09:51 UTC