Cold Weather Maintenance - Landing Gear

TASK 12-31-32-660-001-A
Cold Weather Maintenance - Landing Gear

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

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.

1. Reason for the Job
This procedure gives the cold weather maintenance practices for the landing gear.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	HOT AIR BLOWER OPERATING 40 DEG C(104 F)
No specific	AR	SAFETY BARRIER(S)

B. Referenced Information

REFERENCE	DESIGNATION
TASK 12-14-32-614-001-A	Nitrogen Filling of the Tires
TASK 12-12-00-00	HYDRAULIC FLUIDS - DESCRIPTION AND OPERATION

3. Job Set-up
Subtask 12-31-32-941-050-A

A. Safety Precautions
(1) Put the SAFETY BARRIER(S) in position.

4. Procedure
Subtask 12-31-32-660-050-A

A. General
(1) When the ambient temperature decreases, the pressure in the tires also decreases.
A 3 deg.C (5.4 deg.F) change in temperature causes a 1% change in tire pressure.

NOTE: The tires wear faster if the pressure in the tires is low.

(2) It is recommended that all ice and/or snow is removed from the landing gear before flight. Ice and/or snow contamination could cause a possible malfunction and/or damage the landing gear components on retraction.

Subtask 12-31-32-660-051-A

B. Recommendations
(1) Check the tire pressure
If the aircraft is parked in cold weather conditions (cold soak) for more than one hour, do a check of the tire pressure.
If necessary, correct the pressure with nitrogen (Ref. AMM TASK 12-14-32-614-001).

NOTE: Do not use air to correct the tire pressure. If the ambient temperature is below 0 deg.C (32.00 deg.F), moisture in the air can change to ice in the valve and cause a permanent leak.

(2) Remove ice and/or snow from the landing gear

NOTE: De-ice the landing gear no more than 1 hour before flight.

Use a HOT AIR BLOWER OPERATING 40 DEG C(104 F) to blow air at a maximum temperature of 40 deg.C (104.00 deg.F) at the landing gear assembly. Start at the top and work down the landing gear until all signs of ice and/or snow is removed. Make sure that no ice or snow stays on the components that follow, the:

dynamic joints
lock springs
sliding tube of the shock absorber
piston rod of the retraction actuator
piston rod of the lockstay actuator
proximity sensors and targets
brakes and brake hoses.

(3) Towing
Be careful during aircraft towing operations in cold weather conditions. Do not make small-radius turns which can cause too much load on the sidewalls of the tires.
(4) Hydraulic Fluid
Make sure that the hydraulic systems are filled with low density hydraulic fluid (Ref. AMM D/O 12-12-00-00).

5. Close-up
Subtask 12-31-32-942-050-A

A. Removal of Equipment
(1) Remove the SAFETY BARRIER(S).
(2) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.01 04:22:17 UTC