Deactivation of the Applicable Anti-ice Valve after a NAI SYSTEM FAILED CLOSED Fault

TASK 30-21-00-040-809-A
Deactivation of the Applicable Anti-ice Valve after a NAI SYSTEM FAILED CLOSED Fault

WARNING: WEAR APPLICABLE PERSONAL PROTECTIVE EQUIPMENT (PPE) WHEN YOU DO THIS TASK. BEFORE YOU USE PPE, READ, UNDERSTAND AND OBEY ALL INSTRUCTIONS FOR ITS USE. THESE INSTRUCTIONS INCLUDE INSTRUCTIONS FROM THE MANUFACTURER, YOUR EMPLOYER AND GOVERNMENT REGULATIONS. YOU CAN GET INJURED IF YOU DO NOT USE PPE. GET INSTRUCTIONS FROM YOUR EMPLOYER ON WHICH PPE IS NECESSARY.

FIN: 4010DN ** ON A/C NOT FOR ALL
FIN: 4011DN ** ON A/C NOT FOR ALL

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

B. 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 30-21-00-040-803-A	Deactivation of the NAI Upper Valve with the Thrust Reverser Door Open
TASK 30-21-00-040-803-A-01	Deactivation of the NAI Upper Valve
TASK 30-21-00-040-804-A	Deactivation of the NAI Lower Valve with the Thrust Reverser Door Open
TASK 30-21-00-440-803-A	Reactivation of the NAI Upper Valve with the Thrust Reverser Door Open
TASK 30-21-00-440-803-A-01	Reactivation of the NAI Upper Valve
TASK 30-21-00-440-804-A	Reactivation of the NAI Lower Valve with the Thrust Reverser Door Open
TASK 30-21-00-710-002-A	Operational Check of the Engine-Air-Intake Ice-Protection System (with the Engines in operation)
TASK 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-805-A	Reactivation of the Thrust Reverser System after Ground Maintenance

3. Job Set-up
Subtask 30-21-00-861-083-A ** ON A/C NOT FOR ALL

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

Subtask 30-21-00-941-070-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).

Subtask 30-21-00-865-121-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: 4020KM1 (POWER PLANTDEMOUNTABLE, ENG 1)
122VU	ANTI ICE/ENG/1	1DN1	X10
FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENG 2)
122VU	ANTI ICE/ENG/2	1DN2	W10

Subtask 30-21-00-040-095-A ** ON A/C NOT FOR ALL

D. 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 ground maintenance (Ref. AMM TASK 78-30-00-040-805).

4. Procedure
Subtask 30-21-00-040-096-A ** ON A/C NOT FOR ALL

A. Deactivation of the Applicable Anti Ice Valve after a NAI SYSTEM FAILED CLOSED Fault

CAUTION: REMOVE AND INSTALL PROTECTION COVERS AS NECESSARY TO PREVENT DAMAGE TO THE ENGINE AND ADJACENT COMPONENTS.

CAUTION: WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.

(1) Do the deactivation of the nacelle anti-ice upper-valve (Ref. AMM TASK 30-21-00-040-803).
(2) Do an operational test of the engine-air-intake ice-protection system (Ref. AMM TASK 30-21-00-710-002).
(3) If the maintenance message does not show, keep the nacelle anti-ice upper-valve in the deactivated position and do step 4.A.(9).
(4) If the maintenance message shows, do the reactivation of the nacelle anti-ice upper-valve (Ref. AMM TASK 30-21-00-440-803)
(5) Do the deactivation of the nacelle anti-ice lower-valve (Ref. AMM TASK 30-21-00-040-804).
(6) Do an operational test of the engine-air-intake ice-protection system (Ref. AMM TASK 30-21-00-710-002).
(7) If the maintenance message does not show, keep the nacelle anti-ice lower-valve in the deactivated position and do step 4.A.(9).
(8) If the maintenance message shows, do the reactivation of the nacelle anti-ice lower-valve (Ref. AMM TASK 30-21-00-440-804).
(9) Make an entry in the log book.

5. Close-up
Subtask 30-21-00-942-060-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the WARNING NOTICE(S).

Subtask 30-21-00-440-092-A ** ON A/C NOT FOR ALL

B. Do the reactivation of the thrust reverser system after ground maintenance (Ref. AMM TASK 78-30-00-440-805).

Subtask 30-21-00-865-122-A ** ON A/C NOT FOR ALL

C. 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: 4020KM1 (POWER PLANTDEMOUNTABLE, ENG 1)
122VU	ANTI ICE/ENG/1	1DN1	X10
FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENG 2)
122VU	ANTI ICE/ENG/2	1DN2	W10

Subtask 30-21-00-862-084-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] 2026.04.02 06:19:55 UTC