Deactivation of the Nose-Wheel Steering Electrical Deactivation-Box (for Flight)

TASK 32-51-00-040-002-A
Deactivation of the Nose-Wheel Steering Electrical Deactivation-Box (for Flight)

WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

WARNING: MAKE SURE THAT THE CONTROLS AGREE WITH THE POSITION OF THE ITEMS THEY OPERATE BEFORE YOU PRESSURIZE A HYDRAULIC SYSTEM. UNWANTED MOVEMENT OF HYDRAULICALLY OPERATED ITEMS CAN CAUSE SERIOUS INJURY AND/OR DAMAGE.

WARNING: PRESSURIZE ONLY THE HYDRAULIC SYSTEM(S) THAT IS (ARE) NECESSARY FOR THE TASK. ISOLATE THE OTHER HYDRAULIC SYSTEM(S) BEFORE YOU SUPPLY HYDRAULIC POWER TO THE AIRCRAFT.

WARNING: MAKE SURE THAT ALL THE CIRCUITS IN MAINTENANCE ARE ISOLATED BEFORE YOU SUPPLY ELECTRICAL POWER TO THE AIRCRAFT. UNWANTED ELECTRICAL POWER CAN BE DANGEROUS.

1. Reason for the Job
MMEL 32-51-03B
NWS ELECTRICAL DEACTIVATION BOX
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	TIE WRAP
No specific	AR	WARNING NOTICE(S)

B. Referenced Information

REFERENCE	DESIGNATION
Nose Wheel Steering Deactivation Electrical - Box - Deactivation/Reactivation

3. Job Set-up
Subtask 32-51-00-865-115-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/SPLY	4GG	M36
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/CTL	3GG	M35
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/CTL	1GG	M34
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/IND AND/SPLY	2GG	M33

Subtask 32-51-00-941-062-A

B. Safety Precautions
(1) Put WARNING NOTICE(S) on the panel 400VU to tell persons not to operate the nose landing gear.
(2) On the center pedestal, in the cockpit, make sure that the free-fall control handle of the landing gear is in the normal position.

4. Procedure
Subtask 32-51-00-040-050-A

A. Deactivation of the Nose-Wheel Steering Electrical Deactivation-Box 5GC
(1) On the nose-wheel steering electrical deactivation-box (1), set the lever to the non-towing (engaged) position.
(2) Disconnect the electrical connector (2) from the nose-wheel steering electrical deactivation-box (1).
(3) Put a CAP - BLANKING on the disconnected electrical connector (2).
(4) Safety the blanking cap with TIE WRAP for flight.
(5) Safety the electrical harness away from parts that move.

Subtask 32-51-00-865-116-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
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/SPLY	4GG	M36
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/CTL	3GG	M35
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/CTL	1GG	M34
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/IND AND/SPLY	2GG	M33

Subtask 32-51-00-869-060-A

C. System Consequences and Cockpit Effects
(1) There is no electrical supply at the nose-wheel steering electrical deactivation-box.

The parking brake light on the nose-wheel steering electrical deactivation-box does not operate.
Persons will have to speak to confirm parking brake operation during towing operations.

5. Close-up
Subtask 32-51-00-942-069-A

A. Removal of Equipment
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the WARNING NOTICE(S).
(3) Make an entry in the log book to tell persons that the nose-wheel steering electrical deactivation-box has been deactivated.

[Rev.10 from 2021] 2026.04.01 00:50:51 UTC