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For turns of 90 ° or more, the aircraft speed should be less than 10 kt.
180 ° TURN
For turn of 180°, the following procedure is recommended for making a turn in the most efficient way.
For the CM1
? Taxi on the right-hand side of the runway, and turn left to establish a 20 ° divergence from the runway axis (using the ND or the PFD). The maximum ground speed is 10 kt.
? When CM1 assesses to be physically over the runway edge, smoothly initiate a full deflection turn to the right
? Asymmetric thrust will be used during the turn. Anticipation is required to ensure that asymmetric thrust is established before the turn is commenced [50 % N1 or 1.05 EPR], to maintain a continuous speed of approximately 8 kt throughout the maneuver.
? It is essential to keep minimum ground speed during the turn in order not to need to increase the thrust too significantly so as not to get stuck. It is a good practice that the CM2 calls the GS from ND while in turn
NORMAL OPERATIONS
TAXI
? Differential braking is not recommended, to prevent stress on the landing gear assembly. In addition, a braked pivot-turn is NOT permitted (i.e. braking to fully stop the wheels on one main gear).
? On wet or contaminated runway, more specifically when turning on the runway white or yellow painted marking, tight turn lead to jerky rides of the nose wheel which are noisy and uncomfortable.
For the CM2, the procedure is symmetrical (taxi on the left hand side of the runway).
Aircraft dimensions
BRAKE CHECK
Applicable to: ALL
When cleared to taxi, the PF should set the Parking Brake to "OFF". When the aircraft starts to move, the PF should check the efficiency of the normal braking system by gently pressing the brake pedals, to ensure that the aircraft slows down. The PNF should also check the triple brake indicator to ensure that brake pressure drops to zero. This indicates a successful changeover to the normal braking
system.
CARBON BRAKE WEAR
Applicable to: ALL
Carbon brake wear depends on the number of brake applications and on brake temperature. It does not depend on the applied pressure, or the duration of the braking. The temperature at which maximum brake wear occurs depends on the brake manufacturer. Therefore, the only way the pilot can minimize brake wear is to reduce the number of brake applications.
NORMAL OPERATIONS
TAXI
TAXI SPEED AND BRAKING
Applicable to: ALL
On long, straight taxiways, and with no ATC or other ground traffic constraints, the PF should allow the aircraft to accelerate to 30 kt, and should then use one smooth brake application to decelerate to 10 kt. The PF should not "ride" the brakes. The GS indication on the ND should be used to assess taxi speed.
BRAKE TEMPERATURE
Applicable to: ALL
The FCOM limits brake temperature to 300 °C before takeoff is started.
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A330/A340 机组训练手册 FCTM Flight Crew Training Manual 1(40)
