практична стеля (максимальна корисна висота польоту літака)
operational ceiling (service ceiling)
static ceiling (the highest altitude at which the helicopter is capable of hovering in standard atmosphere) / hover ceiling
absolute ceiling (AC)
ceiling (aeronautics)
ceiling lining
ceiling
ceiling altitude
zero ceiling
hover ceiling
static ceiling
low ceiling
minimum ceiling
operating ceiling
unlimited ceiling
smoke ceiling
ceiling in rank
ceiling height
manpower ceiling
personnel ceiling
maximum ceiling
branch (military/service branch, armed service)
separate from active service / the service
Y service (Y-service) / Y-station
regional meteorological service/ regional weather service (RWS)
emergency service / emergency operations service
active military service
active service/ duty
administrative service
aerodrome control service
age limit for military service
air traffic control service
air traffic service (ATS)