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S
S 1 Generalized symbol for area, eg gross wing area or
reference area [also S W ].
2 Entropy (not UK and some other countries).
3 US piston engines, supercharged (hence, TS =
turbocharged).
4 Aircraft category, scout (USN 1922-46), sonic test
(USAAF 1946-47), ASW (USN from 1946).
5 Aircraft modified mission, ASW (USN pre-1962
suffix, post-1962 prefix).
6 Aircraft category, strike (RAF, RN).
7 Siemens, normally written siemens.
8 JETDS code, special, or detection / range-bearing /
search.
9 South, south pole, southern latitudes (ICAO).
10 Section modulus (alternatively Z).
11 Surface, common missile code for both launch location
and target.
12 Single [especially single wheel on each landing-gear
leg, and runway bearing capacity for such wheel].
13 Distance between contact areas of dual wheels.
14 Serviceable (CAA).
15 Secondary [and secondary airport].
16 Saturated [especially traffic between city pair].
17 VLA (BCAR section).
18 Supplementary [frequency].
19 Snow, or squalls.
20 Stoke[s].
21 Signal or radar power, or energy.
22 Scheduled flight.
23 Superior (warm air mass).
24 Suffix, light-alloys = wrought.
25 Strouhal number [St is preferred].
26 Reluctance.
27 Apparent power (electrical).
28 Sulphur.
29 Now used, with several suffixes, as take-off distances
(US).
30 Landing-gear side load.
31 FAI category: space model.
32 Sears’ function, referred to mid-chord.
33 Slave [Loran station].
34 Strobes.
s 1 Second[s] (time).
2 Stress.
3 Generalized symbol for linear measure, length,
distance; esp. used for aerofoil semi-span (b/2). Also, with
suffixes, various take-off and landing distances, and penetration
distance into a gust.
4 Starboard.
5 Square (eg in rms).
6 Spherical (eg in scp).
7 Static [not total] pressure.
8 Laplace variable.
9 Specific entropy.
S’ Sears’ function, referred to leading edge.
→
S Vector: integrated signal energy, = E → H → , unit Wm -1 .
S0, S 0 Segment zero.
S1 Segment 1.
S2S Sensor-to-shooter.
S 3
1 S-cubed, stick-shaker speed.
2 Step stress screening.
S4 Special-services switching system.
S-band Former common-use radar band originally
19.33-5.77 cm, 1.55-5.2 GHz, later rationalized to 15-7.5
cm, 2-4 GHz; now occupied by E and F.
S-code IFR flightplan code aircraft has 64-code
transponder and approved R-Nav.
S-duct Curved duct suppyling air to centre engine in
trijets, and to turboprops with offset gearbox.
S-gear Full supercharge.
S-ing Series of S-turns, especially in taxiing.
S-manoeuvre To weave in horizontal plane.
S-mode Aircraft transponder provides data-link capability,
e.g. altitude, bearing, range.
S-pattern Wavy track resulting from S-ing.
S-Stoff Rocket fuel: 90-97% RFNA, 10-3% sulphuric
acid (G).
S-turn To describe S in horizontal plane.
SA 1 Situational awareness.
2 Sand or dust storm (ICAO).
3 Standby altimeter.
4 Shaft angle.
5 Surface-to-air.
6 Submerged-arc (weld).
7 Spin axis.
8 Single-aisle (passenger transport aircraft internal
layout).
9 Structural audit.
10 Structured analysis (software).
11 Stand-alone.
12 Safety altitude.
13 Standard Atmosphere.
14 Safety action (FAA).
15 Société Anonyme (F), and Sociedad Anónimo
(Spain).
16 Special access [black].
17 Selective availability, of GPS.
18 Simple approach [runway lighting].
19 Arsine, CW agent.
20 Scientific Advisor (UK).
21 Ship’s Airplane (USN 1917-19).
22 Surface aviation scheduled weather report.
23 Search/attack (USN).
24 Sensitivity analysis.
25 Synthetic aperture.
SAA 1 Society of Airline Analysts (US).
2 Safety and arming.
3 Swiss Aerobatic Association.
4 Systems application architecture.
5 Service access area.
6 Supersonic adversary aircraft [also SSA] (USN).
7 Cargo container for main deck (code).
8 Suphuric-acid anodized [surface finish].
9 School of Army Aviation (UK).
10 South Atlantic anomaly.
11 Seaplane Association of Australia [office,
Greenwich, NSW].
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