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Minimum V2 speed (V2MIN) is limited by both the stall speed (VSR) and minimum control speed (VMC). Which statement is correct?
  • A
    At high-density altitudes and high weight, V2MIN is often limited by the speed for minimum control (VMC).
  • B
    V2MIN cannot be lower than the highest of 1.05 times VMC and 1.2 times VSR.
  • C
    V2MIN is calculated with all engines operating, for flight with one engine inoperative, another safety speed must be used.
  • D
    At high-density altitudes and high weight, V2MIN is often limited by the stall reference speed (VSR).

CS 25.107 Take-off speeds
(b) V2MIN, in terms of calibrated airspeed, may not be less than –

(1) 1·13 VSR for –

(i) Two-engined and three-engined turbo-propeller powered aeroplanes; and
(ii) Turbojet powered aeroplanes without provisions for obtaining a significant reduction in the one-engineinoperative power-on stall speed;

(2) 1·08 VSR for –

(i) Turbo-propeller powered aeroplanes with more than three engines; and
(ii) Turbojet powered aeroplanes with provisions for obtaining a significant reduction in the one-engine-inoperative power-on stall speed: and

(3) 1·10 times VMC established under CS 25.149.


V2 is the minimum speed that needs to be maintained up to acceleration altitude, in the event of an engine failure after V1.

VMC is not affected by weight in straight and level flight, only by the weight of the airplane in a bank. When it is banked, a component of the aircraft weight acts along with the horizontal component of lift to create a more effective sideslip towards the operating engine. So for a given bank, the heavier the airplane, the lower the aircraft’s VMC. The lighter the airplane, the higher the aircraft’s VMC.
However, it is affected by density altitude due to the asymmetric engine thrust – which increases with air density (low altitudes, temperatures and humidity). Based on this, VMC limit is likely a controlling factor at low density altitudes and low aircraft weights (where 1.13 VSR limit is lower).

Based on this at high density altitudes with high weight V2MIN is likely to be limited by VSR.

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