negative g/negative acceleration

negative g/negative acceleration
The applied vertical acceleration on the aircraft is in the reverse direction to that in the normal sense. This condition arises when the control column is pushed forward as in pushovers from a steep climb or while carrying out of outside loops (bunts). An aircraft is designed to withstand much lower values of negative g than it is for positive g. The application of negative g is prohibited in most commercial aircraft except when it is absolutely unavoidable.
G meter indicating that-2 (negative) g has been applied in the maneuver.
Aircraft being pushed over and experiencing negative g.

Aviation dictionary. 2014.

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