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The flight crew is in charge of the steering according to ground indications through the interphone. Due to a face-to-face situation between ground personnel and flight crew, a clear understanding of directional phraseology is essential. The engine 1 will be started when the power push is completed and PPU removed.
During power push, the crew will not use the brakes, unless required due to an emergency and will not move flight controls or flap lever.
In case of emergency, the PPU should be immediately removed out of the evacuation area. Nevertheless, cabin evacuation is possible with the PPU in place.
POWERPUSH
Criteria: P4576, SA
1 Applicable to: MSN 2593-4078
If a Power Push Unit (PPU) is to be used for pushback, the PPU will be placed on the left main landing gear and engine 2 will be started at the gate. This will pressurize the yellow hydraulic circuit for parking brake and NWS. Prior push back, check that there is no NWS DISC memo on the EWD.
The flight crew is in charge the steering according to ground indications through the interphone. Due to a face-to-face situation between ground personnel and flight crew, a clear understanding of directional phraseology is essential.
The engine 1 will be started when the power push is completed and PPU removed.
During power push, the crew will not use the brakes, unless required due to an emergency and will not move flight controls or flap lever.
In case of emergency, the PPU should be immediately removed out of the evacuation area. Nevertheless, cabin evacuation is possible with the PPU in place.
TAXI ROLL AND STEERING
Applicable to: ALL
Before taxi, check that the amber "NWS DISC" ECAM message is off, to ensure that steering is fully available.
 

  NORMAL OPERATIONS
TAXI
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL 

THRUST USE
Only a little power is needed above thrust idle, in order to get the aircraft moving (N1 40 %). Excessive thrust application can result in exhaust-blast damage or Foreign Object Damage (FOD). Thrust should normally be used symmetrically.
TILLER AND RUDDER PEDALS USE
Pedals control nosewheel steering at low speed (± 6 ° with full pedal deflection). Therefore, on straight taxiways and on shallow turns, the pilot can use the pedals to steer the aircraft, keeping a hand on the tiller. In sharper turns, the pilot must use the tiller.
STEERING TECHNIQUE
The Nosewheel steering is "by-wire" with no mechanical connection between the tiller and the nosewheel. The relationship between tiller deflection and nosewheel angle is not linear and the tiller forces are light.
 
Therefore, the PF should move the tiller smoothly and maintain the tiller's position. Any correction should be small and smooth, and maintained for enough time to enable the pilot to assess the outcome. Being over-active on the tiller will cause uncomfortable oscillations.
　
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本文鏈接地址：A318/A319/A320/A321 機組訓練手冊 FCTM Flight Crew Training Manual(58)