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zero-zero (not comparable)

  1. Pertaining to the ejection of the occupant of an aircraft from a grounded stationary position (i.e. zero altitude and zero airspeed).
    • 1965, Aircraft engineering
      Test vehicles used during this extensive programme were a launching stand for the zero-zero ejections...
    • 1988, René J. Francillon, McDonnell Douglas aircraft since 1920
      Both cockpits were enclosed under a large canopy and both crew sat on zero-zero ejector seats.
    • 2002, Walter J. Boyne, Air warfare: an international encyclopedia: Volume 1 (page 190)
      To lessen these forces, as well as achieve zero-zero seat capability—the ability to eject while sitting motionless on the ground—rocket sustainers were added.