Electrically actuated aircraft brakes
An electrically actuated aircraft brake with a carbon-carbon composite heat pack and an electrical actuator for engaging the heat pack and operating the brake. When the brake is not being applied, the brake actuator is adjusted in dependence upon temperature, for example, by controlling the actuator to maintain a temperature regulated position.
1. A method of operating an electrically actuated brake comprising a heat pack with carbon friction discs and an electrical actuator with a movable member for engaging the heat pack and operating the brake, the method comprising a routine for maintaining a running clearance between the movable member and the heat pack when the brake is not applied, the routine for operation during taxiing and between braking operations and comprising, without applying the brake, controlling the actuator to maintain the position of the movable member relative to the heat pack in dependence upon temperature.
2. A method for operating an electrically actuated aircraft brake comprising a heat pack with carbon friction discs and an electrical actuator with a ram movable, from an adjustable initial position, into engagement with the heat pack so as to apply the brake, said method comprising a routine for maintaining a running clearance between the movable member and the heat pack when the brake is not applied, the routine for operation during taxiing and between braking operations and including, without applying the brake:
recording data indicative of the change in thickness of said heat pack with temperature;
measuring the temperature of the heat pack; and
adjusting said initial position of the actuator in dependence upon said data and the measured temperature.
3. An electrically actuated aircraft brake comprising:
a heat pack having carbon friction discs;
an electrical actuator having a movable member for engaging the heat pack and operating the brake; and
control means for controlling a running clearance maintenance routine during taxiing and between braking operations, said routine causing the actuator, without applying the brake, to maintain the position of the movable member, or said position relative to the heat pack, in dependence upon temperature.
4. An electrically actuated aircraft brake comprising:
a heat pack with carbon friction discs;
an electrical actuator with a ram movable, from an adjustable initial position, into engagement with the heat pack so as to apply the brake;
electronic control unit for controlling a running clearance maintenance routine for operation during taxiing and between braking operations and, the routine not including application of the brake, said electronic control unit being operably connected to:
i. means for making available recorded data indicative of the change in thickness of said heat pack with temperature;
ii. means for measuring the temperature of said heat pack; and
iii. means for adjusting said initial position of the actuator in dependence upon said data and the measured temperature and without applying the brake.
5. A method of performing a routine for maintaining a running clearance of an electrically actuated aircraft brake comprising a heat pack with carbon friction discs and an electrical actuator with a ram movable, from an adjustable initial position, into engagement with the heat pack so as to apply the brake, the running clearance being the distance between the ram and the heat pack when the brake is not applied, said method for operation during taxiing and between braking operations and including, without applying the brake:
recording data indicative of the change in thickness of said heat pack with temperature;
measuring the temperature of the heat pack; and
adjusting said initial position of the actuator in dependence upon said data and the measured temperature.