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include the airspace between a segment of a main VOR Federal Airway and its associated alternate
segments, with the vertical extent of the area corresponding to the vertical extent of the related segment of
the main airway.
control cable (aircraft control system component). A steel cable used to connect the cockpit control to
the flight control surfaces of an aircraft. See aircraft control cable.
control circuit (electrical circuit). An electrical circuit used to control other circuits in an electrical device
or system. Control circuits include sensors and measuring devices. The output current in a control circuit is
low, usually just enough to actuate the devices that control the main load current of the device or system.
control column (airplane control system). The control in the cockpit of an airplane on which the control
wheel is mounted. Rotation of the control wheel operates the ailerons, and back-and-forth movement of the
control column moves the elevators up or down.
Control Display Unit. See CDU.
control grid (electron tube component). The grid in an electron tube to which the signal to be amplified is
applied. The voltage on the control grid controls the amount of electron flow allowed between the cathode
and the anode, or plate, of the tube.
control horn (aircraft control system component). The arm on a control surface to which the control
cable or push-pull rod attaches to move the surface.
controllability. The characteristic of an aircraft that allows it to change its flight attitude in response to the
pilot’s movement of the cockpit controls.
controllable-pitch propeller (aircraft propeller). A propeller whose blade pitch angle can be changed in
flight. Takeoff is made with a low blade angle (low pitch) that allows the engine to develop its maximum
power.
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).
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 154
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.
　
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