Deactivation of the Air-Intake Anti-Ice Valves

TASK 30-21-00-040-805-A
Deactivation of the Air-Intake Anti-Ice Valves

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.

CAUTION: MAKE SURE THAT YOU OBEY THE PERMITTED VALVE DEACTIVATION TIME-LIMIT GIVEN IN THE MMEL. IF THE DEACTIVATION TIME IS MORE THAN THIS LIMIT, THERE IS AN INCREASED RISK THAT THE SECOND VALVE FAILED OPEN WILL CAUSE AN ANTI-ICE OVERPRESSURE. IF THE SECOND VALVE FAILS OPEN, THE ECAM WARNING MESSAGE "ANTI ICE ENG 1(2) OVER PRESS" WILL COME INTO VIEW AND DAMAGE TO THE AIR INLET WILL OCCUR. IN THIS CONDITION, REFER TO THE RELATED TROUBLESHOOTING PROCEDURE.

FIN: 4010DN
FIN: 4011DN

1. Reason for the Job
MMEL 30-21-01B
ENGINE ANTI-ICE VALVE
MMEL 30-21-01D
ENGINE ANTI-ICE VALVE
A. Dispatch Action. This procedure gives the instructions to do the deactivation of the Nacelle Anti-Icing (NAI) valve.
The deactivation of the NAI valve can be done:

Mechanically on the NAI valve (lock closed or open). This procedure locks the NAI valve to prevent the movement of the valve disk.
If you do the deactivation of the NAI valve mechanically, follow this task.
Remotely with the Multipurpose Control & Display Unit (MCDU) (lock open only). This procedure gives the instruction for the NAI-valve opening solenoid.
If you do the deactivation of the NAI valve with the MCDU, do the NAI valve lock open (menu mode) Ref. AMM Task 73-29-00-710-808-A.

B. Each engine has two NAI valves installed in the same duct, one forward and one aft. The deactivation procedures are the same for each NAI valve.
C. You can lock a NAI valve in the closed position (which is known as the deactivated-closed condition). In this condition, no anti-ice air can flow from the engine to the inlet cowl assembly.
D. You can lock the NAI valve in the open position (which is known as the deactivated-open condition). In this condition, the other NAI valve must control the flow of anti-ice air to the inlet cowl assembly. Before you lock an NAI valve in the open position, you must make sure that the other NAI valve:
Is not in the deactivated-open condition, and
Is serviceable.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M(3 FT)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CPNCL02737)	safety cable (2)

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
451AL
FOR [1000EM2] (ENGINE-2)
461AL
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR, 451AL
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR, 461AL

D. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 30-21-00-710-802-A	Alternative Operational Test for the Trouble Shooting NAI Valves
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-803-A	Closing of the Fan Cowl Doors
TASK 73-29-00-710-808-A	Nacelle Anti-Icing (NAI) Valve Lock Open (Menu Mode)
TASK 78-30-00-040-807-A	Deactivation of the Thrust Reverser System for Nacelle Maintenance (ICU)
TASK 78-30-00-440-807-A	Reactivation of the Thrust Reverser System after Nacelle Maintenance (ICU)
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
TASK 78-36-00-410-806-A	Closing of the Thrust Reverser Cowl Doors
Nacelle Anti-Icing Valves

3. Job Set-up

NOTE:

If you do the deactivation of the NAI valve mechanically, follow this task.
If you do the deactivation of the NAI valve with the MCDU, do the NAI valve lock open (menu mode) (Ref. AMM TASK 73-29-00-710-808).

Subtask 30-21-00-861-084-A

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).

Subtask 30-21-00-865-102-A

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENGINE 1)
122VU	ANTI ICE/ENG/1	1DN1	X10
FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENGINE 2)
122VU	ANTI ICE/ENG/2	1DN2	W10

Subtask 30-21-00-941-062-A

C. Safety Precautions
(1) On the ENG panel 115VU, on the center pedestal:
(a) Put a WARNING NOTICE(S) in position to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than five minutes before you do this procedure.
(3) On 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) in position to tell persons not to energize FADEC system 1(2).

Subtask 30-21-00-010-101-A

D. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL and 438AR.
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL and 448AR.

Subtask 30-21-00-040-078-A

E. Deactivation of the Thrust Reverser System for Ground Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Do the deactivation of the thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-807).

Subtask 30-21-00-010-099-A

F. Open the left thrust-reverser cowl door (Ref. AMM TASK 78-36-00-010-806):
(1) FOR [1000EM1] (ENGINE-1)
451AL
(2) FOR [1000EM2] (ENGINE-2)
461AL
(3) Put an ACCESS PLATFORM 1M(3 FT) in a correct position.

4. Procedure
Subtask 30-21-00-020-050-A

A. Deactivation of a Nacelle Anti-Icing (NAI) Valve

PRE-SPOL BD-EBU-17019 AND PRE SB BD70CR30-017

(1) Remove the ball lock pin (1) from the storage location in the valve body.
(2) Turn the manual override control to the CLOSE or OPEN position.
(3) Install the ball lock pin (1) in the applicable hole (CLOSE or OPEN) in the valve body.
(4) Make sure that the ball lock pin (1) is installed in the correct location and not in the storage location.

END OF PRE-SPOL BD-EBU-17019 AND PRE SB BD70CR30-017

POST-SPOL BD-EBU-17019 AND POST SB BD70CR30-017

(5) Remove the safety cable:

WARNING: USE GOGGLES WHEN YOU REMOVE OR INSTALL SAFETY CABLE. EACH TIME YOU CUT SAFETY CABLE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE SAFETY CABLE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

(a) Remove and discard the safety cable (2).
(6) Remove the inhibit bolt (3) from the storage location in the valve body.
(7) Turn the manual override control to the CLOSE or OPEN position.

(8) Install the inhibit bolt (3) with CPNCL02737safety cable (2) in the storage location applicable hole (CLOSE or OPEN) in the valve body.
(9) Make sure that the inhibit bolt (3) with the safety cable (2) is installed in the location and not in the storage location.

END OF POST-SPOL BD-EBU-17019 AND POST SB BD70CR30-017

Subtask 30-21-00-865-103-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENGINE 1)
122VU	ANTI ICE/ENG/1	1DN1	X10
FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENGINE 2)
122VU	ANTI ICE/ENG/2	1DN2	W10

Subtask 30-21-00-410-102-A

C. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the access platform(s).
(3) Close the left thrust reverser cowl-door (Ref. AMM TASK 78-36-00-410-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL

Subtask 30-21-00-440-091-A

D. Reactivation of the Thrust Reverser Serviceable after Maintenance
(1) Do the reactivation of the thrust reverser (Ref. AMM TASK 78-30-00-440-807).

5. Close-up
Subtask 30-21-00-410-103-A

A. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL and 438AR.
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL and 448AR.
(2) Remove the WARNING NOTICE(S).

Subtask 30-21-00-710-069-A

B. Test after Deactivation of one Air-Intake Anti-Ice Valve in Open Position (to be done if MMEL condition 30-21-01B is applied)
(1) Do an alternative operational test for the troubleshooting NAI valves (Ref. AMM TASK 30-21-00-710-802).
(2) On the MCDU, select the FAULT REPORT page and:
(a) Make sure that one of these fault messages is shown:

ENGXY-2450-UP NAI VLV PRSOV1 (OPEN), or
ENGXY-2452-DOWN NAI VLV PRSOV2 (OPEN).

(b) Make sure that the fault message(s) related to the valve you locked in the open position, is(are) not shown:

ENGXY-2464-UP NAI VLV PRSOV1 (CLOSED)
ENGXY-2465-DOWN NAI VLV PRSOV2 (CLOSED).

ENGXY-2462-NAI SYSTEM (OPEN).

NOTE: If the message ENGXY-2462-NAI SYSTEM (OPEN) is shown, that means both air-intake anti-ice valves are locked or blocked in the open position. This condition is not permitted. At least one valve must be serviceable.

Subtask 30-21-00-860-089-A

C. Put the aircraft back to its initial configuration.
(1) Remove the WARNING NOTICE(S).
(2) Put a WARNING NOTICE(S) in position in the cockpit to tell persons that the NAI valve 1(2) is deactivated in the open position.
(3) Make an entry in the logbook.

Subtask 30-21-00-862-085-A

D. De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.01 00:28:58 UTC