hard deck(для совершения возд. манёвров; a safety altitude (expressed as AGL). If an aircraft breaks the hard deck, it is considered a safety-of-flight violation (a serious transgression). Commonly 5000 feet AGL. See also Soft Deck; Am.E.: Breaking the hard deck, insubordination... Are you trying to get kicked out?Taras)
soft deck(a safety altitude below which certain maneuvers are prohibited during ACM (Air Combat Maneuvering. Dogfighting practice). Expressed as feet AGL (Above Ground Level). Typically 5,000 feet AGL. See also Hard Deck Taras)