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

TASK 30-21-00-040-002-A
Deactivation of the Engine Anti-Ice Valve in the OPEN Position

Task Summary

Access	Test	Specific Tools	Mhr	E/T	Nb Men
YES	YES	NO	0.3	0.3	1

1. Reason for the Job
MMEL 30-21-01B
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. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP8004)	lockwire 0.6 mm (0.0236 in.) dia

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR

D. 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 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-A	Closing of the Fan Cowl Doors
TASK 71-13-00-410-040-B	Closing of the Fan Cowl Doors
Anti-Ice Valve of the Engine Air Intake

3. Job Set-up
Subtask 30-21-00-861-060-A ** ON A/C NOT FOR ALL

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

Subtask 30-21-00-860-053-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 30-21-00-865-053-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 30-21-00-010-054-A ** ON A/C NOT FOR ALL

D. 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

4. Procedure
Subtask 30-21-00-040-051-A ** ON A/C NOT FOR ALL

A. Deactivation of the Anti Ice Valve

CAUTION: DO NOT APPLY A TORQUE OF MORE THAN 70 LBF.IN. WHEN YOU OPEN OR CLOSE THE VALVE MANUALLY. HIGH TORQUE CAN CAUSE DAMAGE TO THE INTERNAL SHAFT IN THE VALVE. IF THE VALVE DOES NOT OPEN OR CLOSE WHEN YOU APPLY THE SPECIFIED TORQUE, YOU MUST DO AN OVERHAUL OF THE VALVE.

(1) On the anti ice valve 4000DN:
(a) Set the manual override control to OP with a hexagonal wrench and lock it with the locking pin which is on the valve.
(2) Installation of lockwire:

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.

(a) Safety the locking pin with CP8004lockwire 0.6 mm (0.0236 in.) dia.
(3) On the overhead panel 25VU:
(a) Push the ANTI ICE/ENG 1(2) pushbutton switch.

5. Close-up
Subtask 30-21-00-865-058-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 30-21-00-410-054-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 cowl doors (Ref. AMM TASK 71-13-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL, 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL, 448AR

Subtask 30-21-00-860-054-A ** ON A/C NOT FOR ALL

C. Aircraft Maintenance Configuration
(1) Remove the WARNING NOTICE(S).
(2) On the ANTI ICE part of the panel 25VU, make sure that the ENG 1(2) pushbutton switch is pushed. (On the pushbutton switch, the ON legend is on).
(3) Put a WARNING NOTICE(S) in position in the cockpit. This tells persons that the anti ice valve is deactivated in the open position.
(4) Make an entry in the logbook.

Subtask 30-21-00-862-060-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 00:28:39 UTC