Deactivation of the Engine Anti-Ice Valve in the CLOSED Position

TASK 30-21-00-040-020-C
Deactivation of the Engine Anti-Ice Valve in the CLOSED Position

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.

1. Reason for the Job
MMEL 30-21-01A
ENGINE ANTI-ICE VALVE
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
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 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-13-00-410-010-A	Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
Engine Air Intake Anti Ice Valve

3. Job Set-up
Subtask 30-21-00-861-064-A ** ON A/C NOT FOR ALL

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

Subtask 30-21-00-860-084-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put a WARNING NOTICE(S) in position to tell persons not to operate the ENG/MODE selector switch and the ENG/MASTER 1(2) control switch.
(2) On the ENG section 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 FADEC 1(2).
(3) On the ANTI ICE section of the panel 25VU:
(a) Release the ANTI ICE/ENG 1(2) pushbutton switch (the ON legend goes off).

Subtask 30-21-00-865-080-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
FOR FIN: 1000EM1 (ENGINE1)
122VU	ANTI ICE/ENG/1	1DN1	X10
FOR FIN: 1000EM2 (ENGINE2)
122VU	ANTI ICE/ENG/2	1DN2	W10

Subtask 30-21-00-010-089-A ** ON A/C NOT FOR ALL

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

4. Procedure
Subtask 30-21-00-040-071-A ** ON A/C NOT FOR ALL

A. Deactivation of the Engine Air Intake Anti-Ice Valve
(1) Lock the anti-ice valve (1) in the closed position.
(a) Remove the lock pin (3) from the transportation bracket (2) in the valve (1).
(b) Move the valve to the CL position.

CAUTION: DO NOT TIGHTEN THE NUT TO MORE THAN 13 LBF.IN (0.15 M.DAN). IF YOU DO, YOU CAN CAUSE DAMAGE TO THE EQUIPMENT.

1 Turn the nut (5) to the CL position. Do not exceed 13 lbf.in (0.15 m.daN) to turn the nut.
(c) Hold the valve in the CL (closed) position and install the lock pin (3) into the valve locking hole (4).

5. Close-up
Subtask 30-21-00-865-081-A ** ON A/C NOT FOR ALL

A. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 1000EM1 (ENGINE1)
122VU	ANTI ICE/ENG/1	1DN1	X10
FOR FIN: 1000EM2 (ENGINE2)
122VU	ANTI ICE/ENG/2	1DN2	W10

Subtask 30-21-00-410-091-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowls (Ref. AMM TASK 71-13-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR.

Subtask 30-21-00-860-085-A ** ON A/C NOT FOR ALL

C. Aircraft Maintenance Configuration
(1) Remove the WARNING NOTICE(S).
(2) Put a WARNING NOTICE(S) in the cockpit to tell persons which anti-ice valve is locked in the closed position.
(3) Make an entry in the logbook.

Subtask 30-21-00-862-064-A ** ON A/C NOT FOR ALL

D. De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).

[Rev.10 from 2021] 2026.04.01 00:28:45 UTC