the Aviation Dictionary

section line . selected ground delays
resistance is somewhere between these points. A
wheelbarrow is an example of a second-class lever.
section line - The crosshatching used in a cutaway
section of an aircraft drawing to identify a type of
material.
Sectional Aeronautical Chart - Chart designed for
visual navigation of slow or medium speed aircraft.
Topographic information on these charts features the
portrayal of relief, and a judicious selection of visual
check points for VFR flight. Aeronautical information
includes visual and radio aids to navigation, airports,
controlled airspace, restricted areas, obstructions, and
related data. Each chart covers 6" to 8' of longitude
and approximately 4" of latitude. With a scale of
1:500,000 the resolution of terrain features is very
good. Also refereed to as a sectional chart.
sectional view - Drawing details obtained by cutting
away part of an object to show the shape and
construction of the object at the cutting line.
sectioning - Marking a drawing by suitable
crosshatching or other symbols to indicate the material
in the cutaway view of a part.
sector - A part of a circle bounded by any two radii and
the arc included between the two radii.
around the periphery of a circle that indicate pattern
direction on various runways. Often includes a
tetrahedron or wind sock in the center to indicate wind
direction.
segmented rotor brake - A heavy-duty - - multiple disc
brake used on large, high speed aircraft. stators are
keyed to the axle and contain high-temperature lining
material. The rotors, keyed into the wheel, are made in
segments to allow for cooling and the large amounts of
expansion encountered.
segments of an instrument approach procedure - An
instrument approach procedure can have as many as
four separate segments depending on how the approach
procedure is structured.
ICAO
a. Initial Approach - That segment of an instrument
approach procedure between the initial approach fix
and the intermediate approach fix or, where applicable,
the final approach fix or point.
b. Intermediate Approach - That segment of an
instrument approach procedure between either the
intermediate approach fix and the final approach fix or
point, or between the end of a reversal, race track or
dead reckoning track procedure and the final approach
fix or point, as appropriate.
c. Final Approach - That segment of an instrument
approach procedure in which alignment and descent for
landing are accomplished.
sector gear - A portion of a gear that appears to have
been purposely cut from a whole gear wheel. It consists
of the hub as a pivot point and a portion of the rim with d. Missed Approach Procedure - The procedure to be
the teeth. Sector gears generally drive a smaller pinion followed if the approach cannot be continued.
gear for small angular movements.
USA
sector list drop interval - A parameter number of a. Initial Approach - The segment between the initial
minutes after the meter fix time when arrival aircraft approach fix and the intermediate fix or the point
will be deleted from the amval sector list.
where the aircraft is established on the intermediate
course or final course.
sector visibility - Meteorological visibility within a
b. Approach - The segment between the
specified sector of the horizon circle.
intermediate fix or point and the final approach fix.
securing strap - A strap used to secure an oil or fuel c. Final ro roach - The segment between the final
tank to the airframe or engine. -
approach fix or point and the runway, ai~port or missed
approach point.
sediment - Any matter that settles to the bottom of a d, ~ i ~~~~~~~h ~ ~ ~h~ ~ segment d beheen the
liquid or container.
missed amroach . ~oint. or ~oint of arrival at decision
see and avoid - When weather conditions permit, pilots height, and the missed approach fix at the prescribed
operating IFR or VFR are required to observe and altitude.
maneuver to avoid other aircraft. Right-of-way rules
seize - Equipment failure in which moving parts fuse or
are contained in FAR 91.
bind because of friction, pressure, or excessive
seesaw rotor - A term used for a semi-rigid rotor.
temperature.
seesaw rotor system - A rotor system using a semi- SELCAL - A contraction of selective calling referring
rigid rotor
to an automatic signaling system used in aircraft to
notify a particular aircraft of an incoming call.
segment - A division or a section. A part of a figure.
selected ground delays - A traffic management
segmented circle - An on-
procedure whereby selected flights are issued ground
ground visual indicator delays to better regulate traffic flows over a particular
that provides traffic pattern
information. It consists of
fix or area.
"L" shaped indicators
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