時間：2011-03-11 23:11來源：藍(lán)天飛行翻譯 作者：admin 點擊：次
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When the airplane is set up for cruise flight, the pitch of the blades is increased so the propeller advances farther through the air each revolution of the engine. This allows the engine to operate at a slower, more economical speed. A controllable-pitch propeller and a constant-speed propeller are similar, the main difference being the control. The pitch of a constant-speed propeller is controlled by a governor, and the pitch of a controllable-pitch propeller is controlled by a manually actuated valve or switch. controlled airspace (air traffic control). Airspace designated as a continental control area, control area, control zone, terminal control area, transition area, or positive control area within which some or all aircraft may be subject to air traffic control. 14 CFR Part 1: “An airspace of defined dimensions within which air traffic control service is provided to IFR flights and to VFR flights in accordance with the airspace classification. NOTE — Controlled airspace is a generic term that covers Class A, Class B, Class C, Class D, and Class E airspace.” controlled departure time programs (air traffic control). The flow control process in which aircraft are held on the ground at the departure airport when delays are projected to occur in either the en route system or the terminal of intended landing. The purpose of controlled departure time programs is to reduce congestion in the air traffic system or to limit the duration of airborne holding in the arrival center or terminal area. A CDT is a specific departure slot shown on the flight plan as an expected departure clearance time (EDCT). controlled diffusion compressor blade (turbine engine compressor blade). A design of compressor blade used in some of the modern axial-flow gas turbine engines. The leading edge is thicker than that of the conventional circular arc blade. Controlled diffusion blades minimize transonic drag rise and prevent separation of the air over their surface. The thicker leading edges erode far less than the leading edges of circular arc blades. controlled time of arrival (air traffic control). The original estimated time of arrival adjusted by the air traffic control system command center ground delay factor. control locking device (aircraft control system). A device used to lock the flight-control surfaces of an aircraft in their neutral position when the aircraft is on the ground. Control locking devices normally have some type of warning flag to direct attention to the fact that they are installed or engaged. This prevents their being left in place when the aircraft is readied for flight. control panel. The panel in an aircraft cockpit that contains the flight and engine instruments and switches for the operation of the aircraft systems. controlled rectifier. See SCR silicon controlled rectifier. control rod (aircraft control system component). A rigid rod normally made of aluminum alloy tubing used to actuate flight controls from the cockpit. Control rods are often called push-pull rods because of the method of their actuation. |
