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When take-off mode is engaged, the auto-throttle…

  • A
    can never be disengaged.
  • B
    ensures the correct aeroplane angle of attack is maintained.
  • C
    continuously varies thrust to maintain the target speed.
  • D
    sets thrust to a pre-set, fixed thrust setting.
When take-off mode is engaged, the auto-throttle will command maximum thrust. This maximum thrust depends on the pre-set flex temperature that will reduce the maximum delivered thrust to reduce the engine’s wear and ultimately, the maintenance costs for the operator.

Find in this table, the summary of the auto-throttle modes of operation and the respective flight phase:

Flight phase
Auto-throttle mode
Meaning
Ground / TO roll N1 hold auto-throttle commands full thrust for take-off.
Climb N1 hold auto-throttle commands full thrust for climb and the desired speed is maintained by the AP pitch channel.
Climb with V/S IAS hold auto-throttle continuously regulates the thrust output to maintain the required speed.
Cruise / ALT hold IAS/MACH hold auto-throttle continuously regulates the thrust output to maintain the required speed.
Approach IAS hold auto-throttle continuously regulates the thrust output to maintain the required speed.

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