робоча стеля
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)
service ceiling
ceiling lining
ceiling
ceiling altitude
zero ceiling
hover ceiling
static ceiling
low ceiling
minimum ceiling
unlimited ceiling
smoke ceiling
ceiling in rank
ceiling height
manpower ceiling
battlefield operating system (BOS)
buffer and operating-rod group
common operating environment (COE)
contemporary operational environment / contemporary operating environment (COE)
deployment operating base
emergency fleet operating base
forward operating base (FOB)
ground operating equipment
missile operating area
naval base; naval operating base
naval operating base (fixed or temporary)
operating environment (OE)
operating forces
operating forces of the Navy