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see-saw rotor
see-saw rotor See teetering.
S ef , S EF Takeoff distance from brake-release to [not yet
recognised] engine failure
S efg Ground roll to liftoff with one engine inoperative.
SEF Stability enhancement functions.
Sefis, SEFIS Simulated electronic flight-instruments
system.
SEFT Section d’Etudes et Fabrications des Télécommunications
(F).
SEG 1 Signaller, engineer, gunner (RAF aircrew grade,
WW2).
2 Sharp-edged gust; F adds function.
segment 1 One of six standard subdivisions of take-off
flightpath: 1, screen to gear-up at V 2 ; 2, gear-up to top of
initial climb at V 2 ; 3, level acceleration to FUSS; 4, flapsup
to 5-min. power point at FUSS; 5, level acceleration to
en route climb speed; 6, climb to 1,500 ft at ERCS; rest is
en route climb.
2 A second definition is: one of two subdivisions of
climbout, first-* from lift-off to location of noise listening
post or airport boundary, second-* from that point with
power cut back in drift-climb until sensitive area has been
overflown or a declared height is reached. See noiseabatement
climb.
3 Portion of en route flight between two waypoints.
4 Portion of missile flight, eg boost, cruise (or
midcourse) and terminal.
5 See SE&I.
SEGS 1 Selective (inclination) glideslope.
2 Standard-entry guidance system.
SEI 1 Small-engine instruction.
2 Standby engine indicator (or instrument) (CAA). In
other usage E is engineer.
3 Specific emitter identification.
4 Software Engineering Institute [Carnegie Mellon
University] (DoD, US).
5 See SE&I.
SEID Système d’écartometrie IR différentielle (F
missile guidance).
SEIFR Pronounced safer, single-engine IFR.
SE-IMC Single-engine instrument meteorological
conditions.
SEIRS Small-engine IR suppressor.
seizing up Sudden and total arrest of operation of
mechanical device, for whatever reason.
SEKPY Association of defence companies [GR-11252]
(Greece).
SEL 1 Selcal (ICAO).
2 Space Environment Laboratory (NOAA).
3 Single-engine licence.
4 Single-engine, landplane.
5 Select, selector identifier.
6 Switchable eyesafe laser.
7 Sound exposure level, see noise.
8 Surface-emitting laser.
9 Sun/Earth Lagrange point; 1, 2, respectively denote
near or dark side.
Selcal Selective calling.
Selecta-vision Registered name for holographic video
recording.
select code That code displayed when ground interrogator
(SSR, or in US ATCRBS) and airborne
transponder are operating on same mode and code
simultaneously.
self-bias
selected track In traditional US-style airways structure,
link route off-airways authorized to particular flight
equipped with R-nav. Where R-nav systems (eg Decca) in
use for decades term has little meaning because commercial
and IFR pilots are not confined to airways and
VOR radials.
selective address See selective interrogation.
selective availability Management of the GPS by the US
DoD so that civilian receivers cannot have access to the
[22-m, 72-ft] accuracy of P(Y).
selective calling System enabling ground controller to
call a single aircraft, usually long-haul oceanic airline or
bizjet, without the crew having to listen out on that
frequency or any other aircraft being bothered. Selcal
code for each aircraft is four-letter code using letters A
through M, triggering light or loudspeaker. Airborne
decoder usually accepts inputs from VHF or HF.
SeeAdsel, DABS.
selective fading Distortion of signal caused by variation
in ionospheric density which causes fading that varies
with frequency.
selective feathering Manual feathering using selector to
pick out correct propeller.
selective fit Non-standard and rare engineering fit
selected by hand to achieve desired mating of parts.
selective identification facility (or feature), SIF Airborne
pulse-type transponder which provides automatic selective
identification of aircraft in which installed (NATO);
early form of selective interrogation used with Mk X
ATCRBS.
selective interrogation With automated ATC systems,
once aircraft acquired by computer, interrogation necessary
only as radar scans exact sector containing that
aircraft; if each transponder has its own (discrete) address
code, computer can order interrogation on that code in
particular sector, so transponders reply only when
selected, number of replies cut by perhaps 99% and interference
negligible (saturation avoided); two current
systems are Adsel (UK) and Dabs (US).
selective jamming Jamming on single frequencies; often
synonymous with spot jamming but can cover several
specif. frequencies.
selective loading Arranging cargo load to facilitate
unloading in desired sequence.
selective pitch Early term for variable pitch.
selectivity Measure of ability of radio receiver to
discriminate between wanted signal and interference
signals on adjacent frequencies.
selector Manual demand input offering choice, eg *
valve may have four or more fluid-flow positions, flap
* may offer four or more settings, while landing-gear *
normally offers only two.
selenium Se, non-metallic crystalline element, density
4.8, MPt 217°C, high electrical resistance except when illuminated,
thus used in photocells, resistance bridges and,
with semiconductor properties, in rectifiers.
seleno- Prefix, of the Moon: hence *-centric orbit, *-id
(lunar satellite), *-logy (study of Moon).
Self Entry in a personal flying log book meaning the
book’s owner; can be written in capitals.
self-aligning bearing Ball (occasionally other forms)
bearing with outer race having part-spheroidal track
allowing variation in shaft attitude.
self-bias See automatic grid bias.
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