The phrase "air clearance" is correct and usable in written English.
It can be used in contexts related to aviation, construction, or any situation where space or distance from the air is relevant.
Example: "The aircraft requires a minimum air clearance of 20 feet to safely take off."
Alternatives: "aerial clearance" or "vertical clearance".
However, the seismic performance of the 800 kV thyristor valve, which has longer hangers, larger air clearance requirement and is heavier than its lower voltage counterparts, has not been fully investigated.
Brady then requested mortar fire in support; however, the need to request air clearance only resulted in further delay.
A hybrid mesh was generated and solutions were obtained for various lift fan pressures and air-clearance heights.
Two operators at Luton, Signature and Harrod's Aviation, maintain and service private jets, and sort out the logistics such as booking runway slots and air traffic clearance.
The theoretical and experimental results both show that AFD can adjust the air film clearance adaptively according to the vibration of the rotor; this can not only decrease the friction between the journal and the floating ring, but can also provide additional stiffness and damping to the rotor system, thus yielding additional vibration control.
In addition, the task force can aid the Iraqi Army with air support, route clearance vehicles and artillery and mortar fire.
An optimization analysis is further conducted to examine the effect of major parameters, such as working pressure ratio, air inlet temperature, clearance size and scroll vane height to pitch ratio.
The troops that were said to be sent this year will be trained specifically to support the troops already there: medics, room clearance, air, etc. they can save each other.
Aircraft must receive an air traffic control clearance to proceed beyond the boundaries of the corridor, or else make a sharp U-turn and return the way they came.
Contributing to the accident were the flight crew's nonpertinent conversations during taxi, which resulted in a loss of positional awareness and the Federal Aviation Administration's failure to require that all runway crossings be authorized only by specific air traffic control clearances.
Flight turns toward the southwest, with clearance from air traffic control.
