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noun the maximum number of people
an aircraft, bus, etc., can seat
secondary secondary /sekənd(ə)ri/ adjective
1. of the second rank in importance,
etc., not primary 2. an induced current
that is generated by a primary source
secondary radar secondary radar /sekənd(ə)ri
redɑ/ noun a radar system in which
the active target replies to the interrogation
unit
secondary surveillance radar secondary surveillance radar
/sekənd(ə)ri sə|veləns |redɑ/
noun a radar which uses ground equipment
called interrogators and airborne
equipment called transponders to
section 204
identify aircraft, determine altitude and
range, etc.
Secondary surveillance
radar (SSR) is normally used to supplement
data from primary systems.
Abbreviation SSR
section section /sekʃən/ noun 1. a component
or part of a structure
tail section
and nose section of the aircraft
the
non-smoking section of the aircraft 2.
part of a text
The book is divided into
four sections, and the first four chapters
form the first section. 3. a diagram of a
solid object as it would appear if cut, so
that the internal structure is displayed.

cross-section
sectional sectional /sekʃən(ə)l/ adjective 1.
referring to a section or composed of
sections 2. showing a solid object as it
would appear if it were cut
sector sector /sektə/ noun 1. part of the
flight between an aircraft moving under
its own power until it next stops after
landing in its allocated parking position

On some sectors, because of fuel costs
at the destination, it can be economical
to carry excess fuel. 2. the portion of a
circle inside two radii and the included
arc 3. a segment of airspace with its
own team of air traffic controllers
secure secure /s|kjυə/ adjective fastened or
locked, safe
Overhead baggage lockers
must be secure.  verb to attach
firmly, to fasten or to make safe
If the
onset of turbulence is sudden, crew
must immediately secure themselves in
the nearest available seats.
security security /s|kjυərti/ noun 1. safety
2. people whose job is to protect buildings
or other people against crime
SELCAL SELCAL noun a high-frequency radio
system which alerts the crew of an aircraft
to the fact that air traffic control is
trying to contact them. Full form selective
call
seldom seldom /seldəm/ adverb not often,
rarely
Aircraft are seldom hit by lightning.

The wet sump system of lubrication
is seldom used on modern aircraft.
select select /s|lekt/ verb to choose something
such as a particular instrument or
system setting
A reverse thrust lever
in the crew compartment is used to
select reverse thrust.
The cabin pressure
controller is used to select cabin
altitude.
selection selection /s|lekʃən/ noun 1. a
choice of something such as a particular
instrument or system setting
By manual
selection of the heating switch, the
formed ice can be dispersed. 2. a collection
of carefully chosen things
a
selection of photographs
selector selector /s|lektə/ noun a manually
operated device like a switch, which
offers a choice of settings
Turn the
selector control.
The purpose of this
selector is to direct fluid to the appropriate
side of an actuator.
self-contained self-contained /self kən|tend/
adjective independent
The auxiliary
power unit is a self-contained unit.
self-positioning self-positioning /self pə|
zʃ(ə)nŋ/ noun the positioning of the
aircraft on the extended centreline of
the runway using the on-board navigation
system. Also called centre fix
semi- semi- /semi/ prefix half
semicircle semicircle /semi|s%k(ə)l/ noun half
a circle
Most mathematical protractors
are made of plastic in the shape of
a semicircle.
semicircular semicircular /semi|s%kjυlə/ adjective
in the shape of half a circle
Most
mathematical protractors are semicircular
in shape.
semiconductor semiconductor /semikən|dktə/
noun a solid crystalline substance with
electrical conductivity greater than
insulators but less than good conductors

Semiconductor material is used to
make many electronic devices.
senior senior /siniə/ adjective older or
more important in rank
senior cabin
　
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本文鏈接地址：Dictionary of Aviation下(65)