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2 Basic combat unit equivalent to UK wing or US
group (Japan).
sentence In a repair and overhaul cycle, the crucial decision
on each part: serviceable; repair and pool; or scrap
and replace.
SEO Station Engineering Officer (RAF).
SEOS Stabilized electro-optical system.
SEP 1 Specific excess power.
2 Single-engine performance, or piston.
3 Separate, separation.
4 Safety and emergency procedures.
5 Strategic equity partner.
6 Single-event phenomenon.
7 Spherical-error probability.
8 Secondary electric power.
9 Solar-electric propulsion.
Sepak Suspension of expendable penaids by kite.
separated flow Flow no longer attached to surface of
immersed body.
separated lift Vortex lift.
separation 1 Breakdown of attached fluid flow round
body into gross turbulence, occuring at particular time
(stall) or place (* point); possible to have sustained equilibrium
with attached (laminar or turbulent) flow
upstream and complete * downstream.
2 Authorized lateral, longitudinal and vertical clearances
(distances) between aircraft under positive control.
3 Severing of links between rocket stages or other fallaway
sections, also called staging.
4 Time when (3) occurs.
5 Discharge, release from active duty (USAF).
6 Distance, along any axis or direction, between interceptor
and target.
7 Periphery of ground sheet, where it lifts from the
surface.
separation distance A particular meaning is straight-line
distance from aircraft to detonation of its free-fall NW.
separation manoeuvre Energy-gaining manoeuvre at
low-alpha, high thrust, to close (reduce) or extend
(increase) separation in air combat.
separation minima Minimum longitudinal, lateral or
vertical distances by which aircraft are spaced through
application of ATC (1) procedures (FAA).
separation motor Thruster to assist separation (3).
separation point In 2-D flow, point at which velocity of
boundary layer relative to body becomes zero and flow
separates from surface.
separation standards ICAO term for separation (2)
minima.
separation test vehicle, STV Air vehicle for assisting
development of separation (3), esp. of tandem or wrapround
boost motors.
separator See breather.
SEPC Secondary electric-power contactor.
SEPD 1 Standard for the exchange of product data.
2 Secondary electric power distribution ; b adds box, c
center, s system.
Sepla, SEPLA Sindicato Español Pilotos Lineas Aéreas
[office, Madrid] (Spain).
SEPM Scanning electric-potential microscope [differs
from SEM].
SEPP Stress evaluation prediction program.
SEPS 1 Solar electric propulsion system (or stage).
2 Supplemental electric power system.
series
SEPSTO Single-engine protected short takeoff.
SEPT Synthetic environmental procedures [or procedural]
trainer.
SEQ Sequence.
sequenced doors Landing-gear doors close after gear has
been extended.
sequenced ejection 1 Automatic small delays are built in
between events, eg canopy, stick, calf garters, seat,
drogue, harness release etc.
2 Ejection from multiseat aircraft in which crew
members are fired in close-spaced series, captain or
aircraft commander last.
sequence valve Fluid-flow controller scheduled to
perform series of actions in sequence, each completion
starting that following. Common US term: sequencer.
sequencing Assignation by ATC or radar controllers of
strict order in which aircraft under control are to proceed,
eg by selecting arrivals from holding points and, with
path-stretching if necessary, achieving correct
time/distance separation as they join localizer.
sequential collation of range, Secor Long-base-line
system for determining vehicle trajectory by phasecomparison
of responses of vehicle transponder to
interrogation by three ground stations.
sequential computer Connected in series with other
equipment, eg SSR or air-defence radars, eg to predict
conflicts and advise on courses of action.
SER 1 Service, served, serving.
2 Stop [at] end of runway.
3 Serial number, or series.
4 Snap experimental reactor.
SERB 1 Selective Early-Retirement Board.
2 Space-Experiments Review Board.
SERC Science and Engineering Research Council
(UK).
SERD Support-equipment recommended data.
SERE Survival, evasion, resistance [or rescue] and
escape (US joint services).
SEREB, Sereb Société pour l’Etude et la Réalisation
d’Engins Balistiques (F).
Serf Studies of the economics of route facilities (ICAO).
serial 1 Element or group of elements within series given
numerical or alphabetical designation; also that designation
(DoD, NATO).
2 Numerical identity of particular hardware item, eg
aircraft. Usually displayed on item concerned and
recorded in all events concerning item (eg entered in
pilot’s log book, used as radio callsign in US and many
other air forces).
3 In sequence as distinct from parallel; hence * data, *
wiring.
serial data Successive signals passed over single wire or
channel.
serial number See serial (2).
serial rudders Rudder made in front and rear portions,
latter hinged to former and deflecting through greater
angle (eg on Dash 7). Also called serially hinged.
series 1 General term for subdivision or group within a
larger related group, eg aircraft type Halifax II Series 1A,
in this case corresponding to block number, modification
state and other national terms.
2 In routine sequence as in manufacture of successive
identical articles, eg * production, * aircraft; in this
context often redundant word.
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