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Single Engine Taxi Procedures

Single Engine Taxi Procedures Single Engine Taxi Procedures with an A320 family aircraft.

General

In order to save brake life and fuel it is advisable to taxi with one engine, except in operational circumstances like uphill slopes high aircraft gross weights and slippery taxiways.

Before applying this procedure, the flight crew should be aware of the following:

  • Taxi with one engine shut down may require higher thrust than normal. Caution must therefore be exercised to avoid excessive jet-blast and the risk of Foreign Object Damage (FOD)
  • Slow or tight turns in the direction of the operating engine may not be possible at high gross weights
  • When performing a single engine taxi-out, remember that there may be a engine warm up time to be applied
At Arrival
APU
  • Start the APU before shutting down one engine, in order to provide power to the engine fire extinguisher, avoid electrical transients and enable galley and IFE operation)
 Start
Engine minimum cooling time
  • Engines should be operated below 40% thrust / 1.02 EPR for a minimum of 3 minutes before shutting down, in order to thermally stabilize the hot section of the engine.
 Consider

When the APU indicates AVAIL and taxiing in a straight line:

During engine shutdown, a slight jerk forward may occur if the brakes are applied while the aircraft is moving.

Engine 2 Shutdown
Yellow Electric Pump
  • This avoids running the PTU
 On

At Parking:

Yellow Electric Pump Off
Engine 1 Shutdown
At Departure
Brake Accu Pressure
  • If necessary, use Y-Electric Pump to pressurize the Brake Accumulator
 Check
Engine 1
  • Engine 1 pressurizes the green hydraulic system, providing normal braking
 Start
X-Bleed
  • Open the crossbleed valve to supply both packs with engine 1
 Open

Apply the “AFTER START” NORMAL PROCEDURE, however:

Keep the APU running and switch the APU BLEED to OFF
  • The APU generator provides power to the engine fire extinguisher, prevents electrical transients and enables galley and IFE operation. Closing the APU BLEED prevents engine exhaust gases ingestion in the air conditioning system
Delay the ECAM STATUS check and the wing anti-ice setting until all engines are started
Yellow Electric Pump
  • This pressurizes the yellow hydraulic system, providing nosewheel steering without using the PTU
 On

Apply the “TAXI” NORMAL PROCEDURE, however:

Delay the ECAM STATUS check and the wing anti-ice setting until all engines are started
Arm the autobrake after the flight controls check.
Before TakeOff
Engine Warmup time before takeoff
  • The second engine must be started soon enough before takeoff, in order to take into account the engine start time and ensure the applicable engine warm-up time - CFM usually 2 minutes, IAE and NEO's 5 minutes)
 Consider
Engine 2
  • Note: For engine 2 start, the parking brake must be set
 Start
Yellow Electric Pump
  • Note: The yellow electric pump must be set to OFF to enable PTU automatic test during engine 2 start
 Off
APU - Bleed
  • Note: The yellow electric pump must be set to OFF to enable PTU automatic test during engine 2 start)
 On
After 10 seconds
  • Note: Wait 10 s before the ENG 2 start, in order to ensure that the bleed system valves are no longer in transit. This time delay will prevent ENG 1 stall)
 Engine 2 Start

After Engine 2 Started

APU As required
X-Bleed Auto

Apply the "AFTER START" Normal Procedure including

  • ECAM Status Check
  • Selection of Engine 2 Anti-Ice and Wing Anti-Ice as required
After Start Checklist Complete
Flight Controls Check
Auto Brakes Max

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Warning

Only for Flight Simulation!

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