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Minimum control speed on the ground, VMCG, is based on directional control being maintained by:
  • A
    primary aerodynamic control and nose wheel steering.
  • B
    primary aerodynamic control, nose wheel steering and differential braking.
  • C
    primary aerodynamic control only.
  • D
    nose wheel steering only.

According to CS 25.149 and CS 23.149 - Minimum Control Speed:

  • VMCG (minimum control speed on the ground) is defined as the calibrated airspeed during the take-off run at which, when the critical engine is suddenly made inoperative, it is possible to maintain control of the aeroplane using the primary aerodynamic control (rudder control) alone (WITHOUT the use of nosewheel steering), as limited by 667 N of force (150 lbf), and the lateral control to the extent of keeping the wings level to enable the take-off to be safely continued using normal piloting skill.
  • In the determination of VMCG, assuming that the path of the aeroplane accelerating with all engines operating is along the centreline of the runway, its path from the point at which the critical engine is made inoperative to the point at which recovery to a direction parallel to the centreline is completed, may not deviate more than 9.1 m (30 ft) laterally from the centreline at any point.

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