the Aviation Dictionary

feathering ferry flight
feathering - In rotorcraft, the action that changes the
pitch angle of the rotor blades by rotating them around
their feathering (spanwise) axis.
feeder fix - The fix depicted on instrument approach
procedure charts which establishes the starting point of
the feeder route.
feathering axis - In rotorcraft, the axis about which the feeder route - A route depicted on instrument approach
pitch angle of a rotor blade is varied. Sometimes procedure charts to designate routes for aircraft to
referred to as the spanwise axis.
proceed from the enroute structure to the initial
feathering propeller - A controllable pitch propeller
approach fix (IAF).
with a pitch range sufficient to allow the blades to be feedthrough capacitor - A capacitor used to block low
turned parallel to the line of flight. This reduces drag frequencies while passing radio frequencies. Some
and helps prevent further damage to an engine that has magnetos use a feed-through capacitorto serve as the
been shut down after a malfunction.
normal capacitor to minimize arcing - of the uoints.
They also decrease the amount of radio interference
feathering solenoid - A locking, electrical solenoid
caused by electrical energy being radiated from the
used with a Hamilton Standard Hydromatic propeller.
ignition switch lead.
The solenoid keeps the feathering pump running after
the feathering button has been momentarily depressed. feedthrough connector - A connector used to carry a
The solenoid is de-energized when the propeller be- group of conductors through a bulkhead.
comes fully feathered.
feel - The feedback from a power-controlled flight
feathering switch - Hydromatic propellers are standard control or brake system. This "feel" allows the pilot to
equipment on certain models of airplanes, i.e., the sense how much pressure is needed for the operation of
D18C and D18C-T airplanes. These propellers are the system.
controlled by individual, single-acting, Hamilton
feeler gauge - A measuring tool consisting of a series of
Standard propeller governors, and feathering or
precision ground steel blades of various thicknesses. It
unfeathering action is accomplished by individual,
is used to determine the clearance or separation
electric motor-driven pump feathering systems. The
between parts.
pumps are controlled by a feathering switch.
Federal Airways - See Low Altitude Airway Structure.
fence -- A fixed vane that extends chordwise across the
wing of an airplane. Fences prevent air from flowing
Federal Aviation Administration (FAA) - An along the span of the wing.
organization within the Department of Transportation.
Fenwal spot-type fire detection system - A fire
The FAA establishes aviation rulcs and regulations as
detection system utilizing bimetallic thermal switches.
well as enforces those policies. The purpose of the
A fire or overheat condition closes the switches and
FAA is to set the standards for civil aircraft in the
signals the presence of the fire or overheat.
interest of public safety.
ferrite - A magnetic substance that consists of ferric
Federal Aviation Regulations (FAR) - The rules,
oxide combined with the oxides of one or more metals.
regulations, and guidelines established by the FAA to
Femte has high magnetic permeability and high
govern the operation of aircraft, airways, airmen, and
electrical resistance.
the safe operation of civil aircraft.
ferritic stainless steel - Straight chromium carbon and
Federal Communications Commission (FCC) - A
low-alloy steels that are strongly magnetic.
government - board, made up of seven commissioners,
responsible for regulating all interstate electrical ferromagnetic materials - Magnetic materials
communications, including foreign communications composed largely of iron.
- -
that originate in the United States.
ferrous metal - Iron or any alloy containing iron.
feedback - 1. Another way to gauge whether students
arc receiving thc correct message. Students must
ferrule resistor - A group of resistors that have metal
interpret and evaluate the information received and
bands (ferrules) around each end so that they can be
then respond. The transmission of evaluative or
mounted in standard fuse clips.
corrective information to the original or controlling ferrule terminals - The terminals on each end of a
source about an action, event, or process. 2. In tubular fuse. Used for making connections with the
rotorcraft, the transmittal of forces, which are initiated circuit.
by aerodynamic action on rotor blades, to the cockpit
controls, 3. A portion of the output signal of a circuit
ferry - The movement of an aircraft from one location
that is returned to the input. Positive feedback occurs
to another.
whcn the fccdback signal is in phase with the input ferry flight - A flight for the purpose of returning an
signal. Negative feedback occurs when the feedback aircraft to base; delivering an aircraft from one location
signal is out of phase with the input signal.
to another; or moving an aircraft to and from a
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