бездетонаційна робота двигуна
knock-free fuel
accident-free flying / mishap-free flying
mishap-free flying / accident-free flying
accident-free operation
failure-free operation
free-flier operation
trouble-free operation
knock a tank
audible knock
big-end knock
borderline knock curve
engine knock / knocking
high-knock rating gasoline
knock detection by ear
knock indicator
knock off balance
knock tendency
knock test of gasoline
knock-down power
knock-meter
knock characteristic (of gasoline)
knock-down fence
knock out of action
knock out of the war
clandestine operation; covert operation
humanitarian operation; humanitarian relief operation (HUMRO)
PZ operation (pick-up zone operation)
noncombatant evacuation operation (NEO); non-combat evacuation operation
contact-free war
contamination-free
fallout-free
free fall