zero-zero

Adjective

1. Pertaining to the ejection of the occupant of an aircraft from a grounded stationary position (i.e. zero altitude and zero airspeed).
   • Test vehicles used during this extensive programme were a launching stand for the zero-zero ejections... - 1965, Aircraft engineering:
   • Both cockpits were enclosed under a large canopy and both crew sat on zero-zero ejector seats. - 1988, René J. Francillon, McDonnell Douglas aircraft since 1920:
   • 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. - 2002, Walter J. Boyne, Air warfare: an international...
2. Pertaining to weather conditions of zero ceiling and zero visibility (i.e., opaque cloud all the way down to ground level), or to aircraft operations in such conditions.
   • Category IIIc ILS would enable landings in true zero-zero conditions (where the pilots can see nothing, not even the surface of the runway they're on), but the problem of blind taxiing - a necessary capability in order...
3. Involving neither of two powers increasing their stockpile of nuclear weapons.
   • a zero-zero treaty