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flexibility. The characteristic of a material that allows it to be repeatedly bent within its elastic limits and
still return to its original condition each time the bending force is removed.
flexible control cable (aircraft control system component). A steel cable used to connect the cockpit
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controls to the control surfaces. Flexible cable is made up of seven strands of wire, with each stand being
made up of seven individual wires. This is called 7 x 7 cable.
Extra-flexible cable has seven strands, with each strand made of 19 wires, and nonflexible cable is
made of either seven or 19 solid wires wound into a cable.
“Flight check” (air traffic control). A call-sign prefix used by FAA aircraft engaged in flight
inspection/certification of navigational aids and flight procedures.
flight controller (automatic pilot component). The command unit of an automatic pilot. The human pilot
is able to control the flight of the aircraft when the automatic pilot is engaged by using the controls on the
flight controller.
flightcrew member. 14 CFR Part 1: “A pilot, flight engineer, or flight navigator assigned to duty in an
aircraft during flight time.”
flight deck (aircraft compartment). The compartment in a large aircraft in which all the flight, engine,
communications, and navigation controls are located.
flight director system (aircraft automatic flight control system). An automatic flight control system in
which the commands needed to fly the aircraft are computed by the system, shown on a flight instrument,
and followed by the human pilot. In an automatic pilot, these same commands are sent to servos that move
the flight controls.
flight engineer. A flightcrew member of a large aircraft who is responsible for the mechanical operation of
the aircraft and its engines. His or her duties include monitoring the engines, the electrical systems, the fuel
system, and the environmental control system.
flight idle (gas turbine engine operation). An engine speed that produces a minimum amount of flight
thrust. Flight idle RPM is usually in the 70% to 80% RPM range.
flight information service. A service provided by the FAA for the purpose of giving advice and
information useful for safe and efficient conduct of flights.
flight inspection (air navigation aids). In-flight investigation and evaluation of navigational aids to
determine whether they meet established tolerances.
flight level. A measure of altitude used by aircraft flying above 18,000 feet. Flight levels are indicated by
three digits representing the pressure altitude in hundreds of feet. An airplane flying at flight level 360 is
flying at a pressure altitude of 36,000 feet. This is expressed as FL 360. See pressure altitude.
14 CFR Part 1: “A level of constant atmospheric pressure related to a reference datum of 29.92
inches of mercury. Each is stated in three digits that represents hundreds of feet. For example, flight level
250 represents a barometric altimeter indication of 25,000 feet; flight level 255, an indication of 25,500
feet.”
flight line (airport area). The area of an airport in which aircraft are parked while they are being prepared
for flight. Flight lines are also called ramps or tarmacs.
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flight management systems. See FMS.
flight management system procedure (air traffic control). An arrival, departure, or approach procedure
developed for use by aircraft with a slant (/)E or slant (/)F equipment suffix.
flight manual (aircraft documentation). An FAA-approved manual that must be in an aircraft any time it
flies. The flight manual contains information regarding speed limitations, weight and balance, allowable
maneuvers, engine operating limits, and other limitations that apply to the specific aircraft.
flight path. The line, course, or track along which an aircraft is flying or is intended to be flown.
flight plan. Specific information related to the intended flight of an aircraft. A flight plan is filed with an
FAA flight service station or an air traffic control facility. 14 CFR Part 1: “Specified information, relating
to the intended flight of an aircraft, that is filed orally or in writing with air traffic control.”
flight plan area (air traffic control). The geographical area assigned by regional air traffic divisions to a
flight service station for the purpose of search and rescue for VFR aircraft, issuance of NOTAMs, pilot
briefing, in-flight services, broadcast, emergency services, flight data processing, international operations,
and aviation weather services.
　
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