三、起落架系统维护
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起落架系统提供飞机在地面的支撑和滑行，并且具有收放、刹车、转弯等功能。起落架系统的主要勤务工作包括减震支柱勤务、舱门操作、机轮和刹车组件拆装等。
典型维护案例：主起落架机轮和刹车组件拆装。
演示视频：(点击图片进入)
视频解说词：
Outside:
make sure that the L/G safety devices are in position
as well as the wheel chocks.
In the cockpit:
open, safety and tag the Tire Pressure Indicating System (TPIS) and the brake fans C/Bs
put warning notices on the free fall control handle and on the L/G control lever
set the parking brake to OFF
make sure that the pressure is off and the brake fan P/B is set to off.
Outside again:
put the jack in position,
make sure that the dome correctly engages,
lift the L/G.
Wheel removal:
fully deflate the tire if it must be changed,
remove the guard assembly attached by means of 6 screws,
remove the lock wire,
insert a tool to lock the impeller and unscrew the nut,
remove the impeller,
remove the shroud fixed by 2 screws,
disconnect the TPIS sensor connector from the rotating transformer,
NOTE: Note that the TPIS sensor must be removed from the wheel if it is changed,
remove the "V" clamp and the shroud support,
discard the cotterpins, loosen and remove the 2 locking bolts,
loosen the wheel nut using the torque adaptor and remove it,
install the properly greased protection tool,
using a specific tool, remove the wheel.
Brake removal:
disconnect the self-sealing couplings,
disconnect the brake temperature sensor,
using an adaptor, loosen and remove the three nuts and washers, - the protective tool being installed on the axle, remove the wheel.
Brake installation:
remove the protective tool, clean and grease the axle,
the protective tool being fitted, install the brake unit,
make sure that the studs engage correctly on the axle,
install the 3 washers and nuts,
adjust the torque meter value and torque the 3 nuts,
connect the brake temperature sensor,
reconnect the self-sealing couplings,
remove the protection devices.
Wheel installation:
make sure that the driving keys on the brake rotor are correctly aligned,
the axle protective tool being fitted, install the wheel with the tool, - remove the protection device,
install the axle nut,
adjust the torque meter to the pre-torque value and apply it to the nut while turning the wheel,
prevent the rotation of the wheel and loosen the nut,
adjust the torque meter to the torque value,
torque the axle nut,
tighten it until the holes in the nut are aligned with the holes in the axle,
install the locking nuts with the head of the screws facing the axle, - fit the washers and the nuts,
tighten the nut,
safety the locking nuts with split pins,
install the shroud support centered by a centering pin and tighten the "V" clamp,
reconnect the TPIS sensor plug,
install the shroud with the 2 srews,
align the splined driving shaft with the impeller,
install the impeller, prevent its rotation and tighten the nut,
safety the nut with lockwire,
install the guard on the tachometer drive shaft and fit it with the 4 screws.
Close-up:
make sure that the area is clean. Lower the L/G, the tire pressure being previously checked and adjusted,
carefully remove the jack from the L/G dome.
remove the tags and close the circuit breakers,
select the ECAM HYDraulic page,
pressurize the green hydraulic system,
press the braking pedals.
Outside:
check the forward coupling for any leakage.
In the cockpit:
apply the parking brake and check the pressure on the triple gage indicator.
Outside:
check the rear coupling for any leakage.
In the cockpit:
depressurize the hydraulic systems,
select the ECAM WHEEL page,
check the brake temperature and tire pressure for correct indication, - select the brake fans ON.
Outside:
check the brake fans for correct operation.
In the cockpit:
select the brake fans off and remove the warning notices.