Reactivation of the Air-Intake Anti-Ice Valves

TASK 30-21-00-440-805-A
Reactivation 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.

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. This procedure gives the instructions to do the reactivation of the Nacelle Anti-Icing (NAI) valve.

If the deactivation of the NAI valve is done mechanically, then do the reactivation of the NAI valve mechanically.
This procedure unlocks the NAI valve to let it operate automatically to control the flow of anti-ice air from the engine.
If you do the reactivation of the NAI valve mechanically, follow this task.
If the deactivation of the NAI valve is done remotely with the Multipurpose Control & Display Unit (MCDU), then do the reactivation of the NAI valve remotely with the MCDU.
This procedure de-energizes the NAI-valve opening solenoid.
If you do the reactivation 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 reactivation procedures are the same for each NAI valve.
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 [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 reactivation of the NAI valve mechanically, follow this task.
If you do the reactivation of the NAI valve remotely with the MCDU, do the NAI valve lock open (menu mode) (Ref. AMM TASK 73-29-00-710-808).

Subtask 30-21-00-861-074-A

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

Subtask 30-21-00-941-063-A

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) Make sure that the WARNING NOTICE(S) are 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 of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Make sure that the WARNING NOTICE(S) is in position to tell persons not to energize FADEC 1(2).

Subtask 30-21-00-865-104-A

C. 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 30-21-00-010-100-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 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR

Subtask 30-21-00-040-079-A

E. Deactivation of the Thrust Reverser for 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 maintenance (Ref. AMM TASK 78-30-00-040-807).

Subtask 30-21-00-010-102-A

F. Get Access
(1) Open the left thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.

4. Procedure
Subtask 30-21-00-420-050-A

A. Activation 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 CLOSE or OPEN hole 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 storage location in the valve body.

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

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

(4) 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).
(5) Remove the inhibit bolt (3) from the CLOSE or OPEN hole in the valve body.
(6) Turn the manual override control to the CLOSE or OPEN position.

(7) Install the inhibit bolt (3) with the CPNCL02737safety cable (2) in the storage location in the valve body.

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

5. Close-up
Subtask 30-21-00-865-105-A

A. 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 30-21-00-410-104-A

B. 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 30-21-00-440-080-A

C. Do the reactivation of the thrust reverser system after maintenance (Ref. AMM TASK 78-30-00-440-807).

Subtask 30-21-00-410-105-A

D. 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 437AL
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 447AL
(2) Remove the WARNING NOTICE(S).

Subtask 30-21-00-710-070-A

E. Return to Service Testing
(1) Do an alternative operational test for the troubleshooting NAI valves (Ref. AMM TASK 30-21-00-710-802).

Subtask 30-21-00-862-074-A

F. 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