the Aviation Dictionary

quick engine change assembly (QECA) quotient
quick engine change assembly (QECA) - An assembly
made up of an engine, propeller, all accessories, along
with all of the necessary cowling and engine mounts.
Used to minimize downtime when an engine change is
required. Also referred to as a QEC unit or QEC kit.
quick look - A feature of NAS Stage A and ARTS that
provides the controller the capability to display full
data blocks of tracked aircraft from other control
positions.
quick-break fuse - A fuse that contains a spring that
pulls the fuse link apart earlier and more quickly than a
normal fuse.
quick-break switch - A switch that has spring loaded
contacts that snap open and closed. This helps prevent
arcing during the opening and closing of the circuit.
quick-disconnect coupling - A fluid coupling that
incorporates a check valve to prevent fluid loss upon
connecting or disconnecting.
quicksilver - Mercury. A heavy, silver-colored, toxic,
liquid, metallic chemical element with a symbol of Hg
and an atomic number of 80. Mercury remains in a
liquid state under standard conditions of pressure and
temperature. Mercury is approximately 13 times as
heavy as water.
quill shaft - A hardened steel shaft with a hollow cross
section and splines on each end. Torsional flexing of
the shaft is used to absorb torsional vibrations.
quota flow control - A flow control procedure by
which the Central Flow Control Function (CFCF)
restricts traffic to the ARTC Center area having an
impacted airport, thereby avoiding sectoriarea
saturation.
quotient - The number resulting from the division of
one number by another.
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