Deactivation of the NAI Upper Valve with the Thrust Reverser Door Open

TASK 30-21-00-040-803-A
Deactivation of the NAI Upper Valve with the Thrust Reverser Door Open

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.

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

CAUTION: MAKE SURE THAT THERE IS ALWAYS AN ANTI-ICE VALVE (UPPER OR LOWER) ACTIVATED DURING FLIGHT. IF THE TWO VALVES ARE DEACTIVATED, DAMAGE TO COMPONENTS CAN OCCUR.

ZONE: 210
ZONE: 400
FIN: 4010DN ** 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	1	DRIVE 1/4 IN - SQUARE
No specific	1	EXTENSION LENGHT 6 IN (152,4 MM)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)
No specific	1	WRENCH 1/4 IN - RATCHET

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD
400	POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-802-A	Closing of the Fan Cowl Doors
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
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
TASK 78-36-00-410-802-A	Closing of the Thrust Reverser Cowl-Doors
Upper Anti-ice Valve with the Thrust Reverser Door Open

3. Job Set-up
Subtask 30-21-00-941-058-A ** ON A/C NOT FOR ALL

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

Subtask 30-21-00-865-094-A ** ON A/C NOT FOR ALL

B. 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 30-21-00-010-091-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
438AR 437AL
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
448AR 447AL

Subtask 30-21-00-040-072-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 maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 30-21-00-010-092-A ** ON A/C NOT FOR ALL

E. Get Access
(1) Open the right thrust reverser cowl-door (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
462AR

4. Procedure

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.

Subtask 30-21-00-040-073-A ** ON A/C NOT FOR ALL

A. Deactivation of the NAI Upper Valve with the Thrust Reverser Door Open
(1) Lock the NAI upper valve in the open position:
(a) Put a DRIVE 1/4 IN - SQUARE with an EXTENSION LENGHT 6 IN (152,4 MM) in the square hole of the manual override interface.

CAUTION: WHEN YOU TURN THE MANUAL OVERRIDE INTERFACE, DO NOT APPLY A FORCE OF MORE THAN 115 lbf.in (1.3 m.daN). IF YOU DO NOT OBEY THIS INSTRUCTION, YOU CAN CAUSE INTERNAL DAMAGE TO THE NAI VALVE.

(b) Push in the DRIVE 1/4 IN - SQUARE with the EXTENSION LENGHT 6 IN (152,4 MM) and turn the interface 270 degrees counterclockwise with a WRENCH 1/4 IN - RATCHET.
(c) Release the pressure on the interface.
(d) Make sure that the manual override interface locks in position.
(e) Make sure that the notch is adjacent to the words "LOCKED OPEN".
(f) Move the interface a small distance if it is not locked in position.

5. Close-up
Subtask 30-21-00-410-095-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the right thrust reverser cowl-door (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
462AR

Subtask 30-21-00-440-073-A ** ON A/C NOT FOR ALL

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

Subtask 30-21-00-410-094-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR
(2) Remove the WARNING NOTICE(S).

Subtask 30-21-00-865-095-A ** ON A/C NOT FOR ALL

D. 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 30-21-00-942-057-A ** ON A/C NOT FOR ALL

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

[Rev.10 from 2021] 2026.04.01 00:28:47 UTC