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SEV
2 Stores ejector unit.
3 Single-event upset.
SEV 1 Surface-effect vehicle, usually synonymous with
ACV.
2 Severe.
3 Synthetic[ally] enhanced vision.
Seval, SEVAL Sensor EW Tactical Evaluator (USN).
seven-bar format Standard format for presenting
alphanumeric numerals in electronic displays, all
numerals being created by illuminating some of four
vertical and three horizontal bars (eg LEDs).
7 by 19 Standard high-strength steel cable made up of
seven strands each of 19 twisted wires.
7 by 7 Standard steel cable made up of seven strands
each of seven twisted wires.
seven flyings Seven types of flight by dead reckoning,
two plane (plane and traverse) and five spherical
(composite, great circle, Mercator, middle-altitude and
parallel) (US usage, arch.).
720° precision turn Standard US training manoeuvre;
two complete circles flown at full power at as near as
possible constant height at bank angle of 60°.
1760 Standard interface for air-launched stores and
other external loads (DoD).
7500 International transponder code ‘I am being
hijacked’.
Severe Weather Avoidance Plan Approved plan to minimize
ATC disruption caused by occasional need to
re-route traffic to/through impacted terminal and/or
ARTCC areas (FAA).
SEVIRI, Seviri Spinning enhanced visible IR imager.
SEVVA Security Evaluation, Validation and
Verification Agency (UK).
Sewaco Sensor weapon command and control system.
SEWS Satellite early-warning system.
SEWT Simulator for electronic-warfare training.
S exp , S EXP Exposed wing area.
sextant Optical instrument for measuring altitude of
celestial bodies.
Seybolt Hand tester of aircraft fabric which measures
force required to punch a controlled hole.
SEZ Selector engagement zone.
SF 1 Signal frequency (often s.f.).
2 Scheduled freight.
3 Stick force.
4 Secondary/final talkdown [S/F preferred].
5 Special Forces (USA).
6 Standard form.
7 Sampling frequency.
8 Shear force.
S/F 1 Ratio of system operating time divided by flight
hours.
2 Secondary final talkdown.
SFA 1 Société Française d’Astronautique (F).
2 Sous-direction de la Formation Aéronautique (F).
3 Sintered ferrite absorber (RAM).
4 Single-frequency approach.
SFACT Service de la Formation Aéronautique et du
Contrôle Technique; responsible for civil aircraft and
aircrew licensing (F).
SFAR Special Federal Aviation Regulation[s] (US).
SFC 1 Simulated flight cycle[s].
2 Surface (ICAO).
3 Side-force control.
SFOV
4 School of Fighter Control (RAF Boulmer).
sfc, s.f.c. Specific fuel consumption.
SFCA Service des Fabrications du Commissariat de
l’Air (F).
SFCC 1 Side-facing crew cockpit, ie has flight engineer
panel.
2 Slat/flap control computer[s].
SFCS 1 Survivable flight-control system, USAF/
McDonnell FBW programme of 1968.
2 Safety flight-control system; protects aircraft (eg
Concorde) against excessive AOA or jammed control
column.
3 Secondary flight-control system.
4 Simplified fire-control system.
SFD 1 Simple formattable document, immediately
ready for message transmission.
2 Special Forces Directorate (UK).
3 Squeeze-film damper.
SFDAS Société Française de Droit Aérien et Spatial
(F).
SFDB Superplastic forming and diffusion bonding;
important manufacturing technique in which structure is
welded from sheet into gas-tight envelope and then
inflated in heated mould until diffusion-bonded into
desired shape.
SFDC Satellite Field Distribution Center (NMC).
SFDF Subsystem fault-detection function.
SFDO School of Flight Deck Operations (UK).
SFDR Standard flight-data recorder.
SFDS Secondary, or standby, flight-display, or flightdata,
system.
SFE 1 Supplier, or seller-, furnished equipment.
2 Sensor front end; / GA adds gimbal assembly.
SFEA Survival and Flight Equipment Association
(UK).
sferics Study of atmospheric radio interference, esp.
from met. point of view; sometimes spelt spherics.
SFF 1 Self-forging, or forming, fragment.
2 Svensk Flughistorik Forening (Sweden).
SFFL Standard foreign fare level (IATA).
SFG Standby flight group [display].
SF/g Stick force per g.
SFI Special flying instruction (CAA).
SFIRR Solid-fuel integrated rocket/ramjet.
SFK Aramid (spider-fibre) reinforced plastics
composite (G).
SFL 1 Safe fatigue life.
2 Sequenced flashing light[s].
SFLOC, SFloc Synoptic filing of location, of sources of
atmospherics.
SFM 1 Sensor-fuzed munition.
2 Self-forging munition.
3 Surface feet per minute [machining].
SFMR Stepped-frequency microwave radiometer.
SFNA Société Français de Navigation Aérienne
[formed 1863 by merger of Senama and Sd’A] (F).
SFNP Stick-fixed neutral point.
SFO Simulated flameout.
SFOC Space flight operations center.
SFOCS Single fibre optical communications system.
SFOF Space Flight Operations Facility, part of DSN.
SFOR Stabilization Force (NATO).
SFOV Sensor field of view.
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