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surge point
a plot of pressure ratio against mass flow, the locus of all
surge points. Generally same as stall line, stability line.
surge point Any combination of airflow and pressure
ratio for gas turbine at which surge occurs.
surging 1 Occurrence of surge (1).
2 Fault in wind tunnel characterized by erratic or lowfrequency
pulsations in velocity, flow and pressure.
3 See sloshing.
surpic Surface picture.
surrogate factory One engaged in assembly of kit-built
aircraft.
surrogate tanker An aircraft acting the part of an air-refuelling
tanker; hence surrogate receiver.
Surtass Surveillance towed-array sonar system.
surveillance Systematic observation of aerospace, surface
or subsurface objects by any kind(s) of sensor.
surveillance approach Instrument approach conducted in
accordance with directions issued by ground controller
referring to a surveillance radar display (DoD).
surveillance radar 1 Primary radar scanning in azimuth,
often through 360°, supplying P-type display (PPI). Not
normally giving elevation or height of aerial targets.
2 Specif., primary radar whose purpose is to determine
az/el position, track and (with SSR) identity of all aerial
targets, and to provide radar separation, navigational assistance,
storm warning and vectoring for final approach (but
not normally to handle complete radar approach).
surveillance radar element, SRE Portion of GCA system
which vectors incoming traffic until established on ILS and
handover to PAR.
surveillance system Any means of surveillance not
contained wholly in one vehicle or site, eg RPV, electronic
communications and guidance, digital sensor data-link,
and control/receive ground station.
survey 1 To examine damaged vehicle, eg crashed
aircraft, often on behalf of insurers or underwriters, to
establish damage, possibility of salvage (eg to fly out from
crash site) and best course of action.
2 Normal meaning in photogrammetry and mapping.
3 Examination by surveyor (see below).
surveyor Technically qualified and designated official
empowered to collaborate with aerospace design staff on
behalf of national certification authority and examine
subsequent hardware and design software to establish
compliance with airworthiness requirements; usually
concerned with particular design aspect, eg fluid systems,
or with particular class of aircraft.
Surviac Survivability/vulnerability information analysis
center.
survivability Capability of a system to withstand a manmade
hostile environment without suffering an abortive
impairment of its ability to perform its designated mission
(USAF). Refers specif. to various effects of NW attack, eg
degradation of volatile memory.
survivability planner and associated re-router
Automatically responds to battlefield threats to friendly
aircraft.
survival capsule Detachable crew compartment, normally
of military aircraft, capable of separation in emergency and
soft landing on land or water, thereafter serving as shelter.
survival kit Man-portable package containing items to
help sustain life remote from other human beings.
survival radio Self-contained, portable, shockproof,
SVD
floating radio emitting homing (and possibly voice) signals
on 121.5 and 243 MHz.
Survsat Survivable sat-com system.
SUS 1 Saybolt universal second[s].
2 Signal, underwater sound.
susceptance Reciprocal of reactance, defined as ratio of
current quadrature component to voltage for same
frequency, B = 1 X, unit siemens.
susceptibility Degree to which any hardware is open to an
attack as a result of inherent weakness (DoD).
suspended underwing unit Dispenser.
suspension 1 Linkage between aerostat and load, hence *
band (fabric band linking envelope to * lines), * bar
connecting suspension lines to basket ropes in balloon, *
line, main connections between envelope and basket or
suspended car, and * winch connecting kite balloon to
surface (6).
2 System of particles dispersed through fluid, including
atmosphere.
suspension strop Webbing or wire rope connecting helicopter
and cargo sling.
sustained flight Time-invariant flight, ie steady lift and
airspeed.
sustained readiness program Keeping fleet operational by
replacing structural parts damaged by fatigue or corrosion.
sustainer Propulsion, either rocket or airbreathing, that
provides power for sustained flight following short highthrust
acceleration period under power of boost motor(s).
Not normally applied to any stage of large or small multistage
vehicle; must be long-duration propulsion system
handling entire mission after separation or burnout of
booster (in ramrockets and many related systems may in
fact use booster case for combustion).
SUT 1 Autothrottle servo.
2 Tailplane [stabilizer] trim servo.
3 Surface and underwater target.
4 System under test.
Sutherland law Gives temperature variation for viscosity
of air.
Sutton harness Traditional (WW1) personal seat harness
with two lapstraps, two shoulder straps and central pinned
clip passing through all four.
SUU 1 Suspended underwing unit (US).
2 Secondary user unit.
SUVOS Semiconductor UV optical source[s].
SUW Surface warfare.
SV 1 Satellite, or space, vehicle.
2 State vector.
3 Static vent.
4 Simulation validation.
5 Shop visit.
6 Synthetic vision [S adds system].
7 Singular value.
8 Solenoid [-driven] valve.
9 Servo valve.
S V Abb. for sievert.
SVA Security violation alert.
SVAS Shuttleworth Veteran Aeroplane Society (UK).
SVC 1 Service, service message.
2 Switched virtual circuit.
SVCBL Serviceable (ICAO).
svce, SVCE Service.
SVCS Secure-voice communications system.
SVD 1 System verification diagram (software).
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