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hard deckstresses
mil., avia. безопасная высота (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)
hard deck: 1 phrase in 1 subject
Nautical1