one-in-sixty rule /wn .n s.ksti rul/ noun in navigation, every 1° of track error, and every 60 nautical miles flown, results in the aircraft being 1 nm off track
onshore /.n../ adjective towards the coast
onshore wind /.n.. w.nd/ noun a
wind which blows from the sea towards
the coast. Compare offshore wind opacity /.υps.ti/ noun the state of not allowing light to pass through .
Sometimes, it is possible to estimate the depth and opacity of the layer of mist or fog from the ground observations.
opaque /.υpe.k/ adjective not allow-ing light to penetrate or pass through .
Rime ice is an opaque, white, granular ice which forms on leading edges.
opening 162
opening /.υp(.)n../ noun 1. a space which acts as a passage through which something or somebody can go . an inlet valve opening 2. a formal start of operation . the opening of the new fly-ing school 3. a vacancy for a job . There’s an opening for a new chief ground instructor.
open-skies /.υp.n ska.z/ adjective
referring to a policy of allowing aircraft belonging to any country to fly over an area, without restrictions on surveil-lance of military installations
operate /.p.re.t/ verb 1. to control the working of . The control column operates the ailerons and elevators. . The flaps are operated by a switch. 2. to use or manage . The airline operates a fleet of Boeing aircraft. 3. to perform or function . Jet transports operate at high altitudes. 4. to perform a surgical procedure, by cutting into the body .
The surgeon operated on the patient.
operating jack /.p.re.t.. dk/
noun a device which converts rotary motion into linear or reciprocating motion in order to move heavy control surfaces
operating weight /.p.re.t.. we.t/
noun the total mass of aircraft ready for flight but excluding fuel and payload .
The type of undercarriage fitted to an aircraft is governed by the operating weight.
operation /.p.re..(.)n/ noun 1. the process of making something work .
The operation of the ignition system in a light aircraft is quite simple. 2. .
long-haul operations flying over long-distance routes 3. an effect . to come into operation to come into effect .
The new procedures come into opera-tion on 1st January. 4. a surgical proce-dure . The doctor performed an opera-tion. 5. a procedure such as addition or subtraction
‘…periodically check the carburettor heating system and controls for proper condition and operation’ [Civil Aviation Authority, General Aviation Safety Sense Leaflet]
operational /.p.re..(.)n.l/ adjec-tive 1. working or functioning . Air traffic control facilities were not opera-tional at the time of the accident. . the operational life of the aircraft the expected working life of an aircraft 2. ready for use, referring to an aircraft in a suitable condition to fly . an opera-tional aircraft an aircraft that can be used for its assigned purpose
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