the Aviation Dictionary

instrument flight rules (IFR) flight plan which
authorizes the pilot of an aircraft to proceed visually
and clear of clouds to the airport via visual landmarks
and other information depicted on a charted visual
flight procedure. This approach must be authorized and
under the control of the appropriate air traffic control
facility. Weather minimums required are depicted on
the chart.
chase - An aircraft flown in proximity to another
aircraft normally to observe its performance during -
training or testing.
chase aircraft - See Chase.
chasing threads - The process of cutting screw threads
by moving a tool along the surface of the work to be
threaded.
chassis - An aluminum, copper, or plated steel body
around which an electronic unit is built. It serves as the
support for the electronic components, power supply,
etc., and is often used as a voltage reference point.
chassis ground - In electricity, a ground connected to
the case or chassis of electronic equipment. See also
earth ground.
chattering brakes - A heavy vibration in the brakes
produced by the brake friction as the disks rotate.
Chattering can be caused by glazed discs.
check flight - A test flight to check the aircraft
performance after major re-work or repairs.
check list -- A sequential systematic list of specific
procedures to be followed when performing any
complex operation. For example, check lists are used in
the performance of preflight inspections, 100-hour
inspections, and annual inspections of aircraft to ensure
all required operations are completed.
check nut - A thin nut jammed against another nut to
prevent it from loosening.
check valve - A valve that allows free flow of fluid in
one direction but prevents or restricts fluid from
flowing in the opposite direction.
checklist - A systematic list of items and equipment on
board an aircraft intended for reference, verification, or
identification. An essential tool for safely flying the
airplane.
checkpoint - A navigation location identified either
visually or electronically.
cheesecloth - A lightweight cotton gauze that has no
sizing in it. It is used as a polishing cloth or as a
straining element to remove lumps and contaminants
from liquids.
chemical bond - An adhesive agent that is applied to
two or more parts or pieces. Joins them together by
molecular attraction
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chemical compound - The substance formed by the
chemical reaction between two or more chemical
elements.
chemical element - A fundamental substance that
consists of atoms of only one kind. Examples of
chemical elements include oxygen, carbon, gold, silver,
and hydrogen.
chemical energy - The energy stored in chemicals due
to their attraction to or reaction with other chemicals.
chemical etching - I. A process in which small cracks
in aluminum are detected by application of a caustic
soda solution. 2. A chemical Drocess used to etch
(roughen) the surface of metal in preparation for
priming or painting.
chemical fire extinguisher - A fire extinguisher that
extinguishes fire by expelling a chemical fire
extinguishing agent.
chemical milling - A chemical etching process used to
machine large sheets of metal. Chemical milling
economically reduces the weight of the aircraft and
produces a lightweight skin that has all of the needed
strength and rigidity than can be done with
conventional machining or by using riveted-on
stiffeners.
chemical reaction - A chemical alteration in a
substance to form a chemical compound. This is
always accompanied by an energy change.
chemical salt - The result of the combination of an
alkali with an acid. Salts are generally porous and
powdely in appearance and are the visible evidence of
corrosion in a metal.
cherry picker - A hydraulically operated boom with a
large basket on its end. A person can be lifted into the
basket in order to work at high locations on large
airplanes.
Cherry@ rivet - A form of
blind rivet patented and
manufactured by the Cherry
division of Textron. Inc. An
upset head is formed by pulling the tapered stem
through its hollow shank.
chevron seal - A single-direction seal in a hydraulic or
pneumatic actuator. It derives its name from its V-
shaped (chevron) cross section.
chilled iron - Cast iron that has been cast in a steel
mold. The casting is quickly cooled by the steel mold
so that it retains most of the carbon as well as a high
degree of hardness.
chin - An aircraft structure that sticks out from the
bottom of the forward part of the fuselage.
chine - The longitudinal member on the side of a float
or seaplane hull where the bottom and the side meet.