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Three letter identifiers are assigned to every flight service station and are annotated in
Airport/Facilities Directories (A/FDs) and FAA Order 7350.6 as tie-in-facilities.
flight data recorder. See FDR.
flight service station. See FSS.
flight simulator. A training device that duplicates the flight characteristics of an aircraft. The simulator
looks like the flight deck or cockpit of a specific aircraft. All the controls and instruments are computer
driven, and they duplicate those in the aircraft. The controls have the same feel, and the instruments give
the same indications as those in the real aircraft.
Flight simulators allow many different types of emergency situations to be simulated under safe
conditions, so flight crews will know how to respond when a real emergency occurs.
flight standards district office. See FSDO.
flight test. Flight for the purpose of investigating the flight or operational characteristics of an aircraft or
aircraft component, or evaluating an applicant for a pilot certificate or rating.
flight time (aircraft records). 14 CFR Part 1: “The time from the moment the aircraft first moves under
its own power for the purpose of flight until the moment it comes to rest at the next point of landing.
(‘Block-to block’ time.)”
flight visibility. 14 CFR Part 1: “The average forward horizontal distance, from the cockpit of an aircraft
in flight, at which prominent unlighted objects may be seen and identified by day and prominent lighted
objects may be seen and identified by night.”
flight watch (air traffic control). A shortened term for use in air-ground contacts on the frequency of
122.0 MHz to identify the flight service station providing enroute flight advisory service (EFAS).
flint lighter (welding equipment). A device used to light an oxy-gas welding torch. The lighter consists of
a small piece of flint that can be rubbed against a piece of rough, hardened steel. A metal cup behind the
steel prevents the flame from reaching out and burning anything as the torch is being lit.
flip-flop (digital electronic building block). A digital building block having two stable states, used to
store information. A flip-flop is made of two cross-coupled NAND or NOR gates that act as a latch. The
output of each gate is applied to the input of the other.
floated battery. A storage battery permanently installed across the output of a generator. The generator
carries the normal electrical load and keeps the battery fully charged at all times. The battery supplies
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 256
current to help the generator when the electrical load is unusually high.
floating ground (electrical equipment). See chassis ground.
flqoat-type carburetor. A type of carburetor used on reciprocating engines in which the fuel-metering
force is produced by a float-operated needle valve that keeps the fuel level a constant distance below the
edge of the discharge nozzle.
flock. Pulverized wool or cotton fibers mixed with an adhesive. Flock can be sprayed on metal to produce a
velvet-like protective finish. It can also be bonded to wire screen and used as a filtering element for certain
types of air filters.
flooded engine (aircraft engine condition). A reciprocating engine that has too much fuel in its cylinders
for it to start, or a turbine engine that has so much fuel in its combustors that it would create a fire hazard or
a hot start if the fuel were ignited.
flow chart. A diagram that uses special symbols connected by arrows or lines to indicate the sequence of
step-by-step procedures that must be followed to accomplish a given task. Flow charts are used to design a
computer program and to explain processes that take place in manufacturing.
flow control (air traffic control). Measures designed to adjust the flow of traffic into a given airspace,
along a given route, or bound for a given airport in order to ensure the most effective utilization of the
airspace.
flow-control valve (fluid power system component). A fluid power valve that controls the direction or
amount of fluid flow. Most fluid power systems use both flow-control and pressure-control valves. Check
valves and selector valves are examples of flow-control valves.
flow divider (turbine engine component). A component in a turbine engine fuel system that routes all of
the fuel to the primary nozzles or primary orifices when starting the engine and when the RPM is low.
When the engine speed builds up, the flow divider shifts and opens a passage to send the majority of the
fuel to the secondary nozzles or orifices.
flow divider (reciprocating engine component). The valve in an Precision Airmotive RSA fuel injection
　
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