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Which of these statements about VMCG determination are correct or incorrect?

I. In order to simulate a wet runway, nose wheel steering may not be used during VMCG determination.
II. During VMCG determination, the CG should be on the forward limit.

  • A
    I is incorrect, II is incorrect.
  • B
    I is incorrect, II is correct.
  • C
    I is correct, II is correct.
  • D
    I is correct, II is incorrect.

In simple words, VMCG is established as being the lowest speed at which rudder effect alone (without the use of nosewheel steering) is sufficient to regain and maintain directional control after a sudden engine failure.

VMCG must be established with the most unfavourable CG position. The aircraft rotates around the CG, therefore the position of the CG directly affects the length of the rudder arm and, thus, the power of the rudder and fin to maintain directional stability and control. The ‘worst case’ is with the CG at the aft limit. If the requirements can be met in this configuration, the ability to maintain directional control will be enhanced at any other CG location. A more forward CG decreases VMCG.

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