How to perform a wheel change and safety precautions

WHEEL CHANGE PROCEDURE AND PRECAUTIONS

Safety Precautions

(1) Put the safety barriers in position.
(2) Put the warning notice in the cockpit to tell persons not to operate the landing gear.
(3) Make sure that the wheel chocks are in position.

Wheel Assembly Check (to be accomplished prior to wheel removal)

Check wheel assembly for missing, broken or loose tie-bolts.

CAUTION : TIRES ON WHEEL ASSEMBLIES WITH MISSING, BROKEN OR LOOSE TIE- BOLTS MUST BE DEFLATED BEFORE AXLE NUT IS LOOSENED. FAILURE TO DEFLATE TIRE BEFORE AXLE NUT IS REMOVED CAN RESULT IN INJURY SHOULD WHEEL SEPARATE.

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

121VU HYDRAULIC/BRK FAN/WHEELS/3 AND 4
121VU HYDRAULIC/BRK FAN/WHEELS/1 AND 2
121VU HYDRAULIC/BRK/FAN/CTL

D. Aircraft Maintenance Configuration
(1) Make sure that the PARK BRK control switch is set to ON.

NOTE : On the panel 400VU, make sure that brake pressure indication on the Yellow brake-pressure triple indicator is correct.

If necessary pressurize the brake accumulator with Yellow pump (Ref. TASK 29-10-00-863-002).

(2) Lift the related axle with a jack.

(3) Fully deflate the tire.

NOTE : If you must remove the wheel for access it is not necessary to deflate the tire if:

– the tire is in the correct condition and
– the tire pressure is in the Normal Operating Range
(Ref. TASK 32-41-00-210-003).
If you have not these two conditions you must deflate the tire.

4 . Procedure – Removal

A. Preparation of the Wheel before Removal

(1) Remove the fan

(2) Remove the joint

B. Removal of the Wheel

(1) Remove and discard the cotter pins (4).
(2) Remove the nuts (5), the washer (6) and the bolts (8).
(3) Remove the axle nut (7) with the ADAPTOR MLG
(4) Install the PROTECTOR
(5) Apply a thin layer of COMMON GREASE  on the axle protector.
(6) Remove the wheel.

4 . Procedure – Installation

If the wheel is equipped with a pressure sensor seal cap, make sure that the seal cap is properly installed and secured with nut and cotter pin.

A. make sure you are taking the right tire..

B. Preparation of the Wheel before Installation.

MAKE SURE THAT THE GREASE USED FOR THE AXLE SLEEVE IS THE SAME AS THE GREASE USED FOR THE BEARINGS (CONE AND CAGE). IF YOU USE A DIFFERENT GREASE, YOU CAN CAUSE DAMAGE TO THE BEARINGS.

C. Prepare A dolly..

D. Make sure the thread protector is installed.

(1) Align the wheel (1) with the driving keys on the brake rotor and
install the wheel.
(2) Remove the PROTECTOR (F46754-1000).
(3) Install the axle nut (7) on the axle and tighten it with the ADAPTOR MLG (H47682).
(4) In the cockpit, set the PARK BRK control switch to OFF.
(5) Turn the wheel in the direction of the axle nut rotation and TORQUE the axle nut IAW AMM.

(6) Prevent the rotation of the wheel and loosen the axle nut (7) to IAW AMM.
(7) Turn the wheel in the direction of the axle nut rotation and TORQUE the axle nut (7) to IAW AMM.
(8) Tighten the axle nut (7) until the holes in the nut are aligned with the holes in the axle.
(9) Install the bolts (8), the washers (6) and the nuts (5).

NOTE : Install the heads of the bolts (8) in the axle.

(10) TORQUE the nuts (5) to IAW AMM.
(11) Install the cotter pins (4).
(12) Turn the wheel manually to make sure that it is installed correctly.

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