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squawk (number)
squawk (number) Operate in Mode A/3 on designated
code.
squawk (number) and ident Operate on specified code in
Mode A/3 and engage ident (mil IFF I/P).
squawk standby Switch to standby position.
squeaker 1 Fitted to friendly aircraft to warn of nearby
balloon cables (WW2).
2 Perfect touchdown, synonymous with greaser.
squeeze-film bearing Provided with small annular space
between outer track and housing filled with pressure-feed
lube oil which cushions dynamic radial loads, thus
reducing engine vibration and possible fatigue. It enables
a shaft system to rotate about its true centre of mass. The
oil film is often called a squeeze-film damper.
squeeze riveting Rivet closure by single sustained force
instead of blows.
squelch 1 Subcircuit in communications receiver which
holds down volume to reduce output noise until a signal
is received.
2 Pilot control of volume or signal/noise ratio.
squib Any small pyrotechnic used as source of hot gas,
eg to fire igniter of rocket or fuel in some (eg missile/RPV)
gas turbines.
squib valve Ambiguous, has been used to mean (1) solenoid
valve for controlling thrusters (Apollo RCS) or
(2) squib-actuated valve.
Squid Trade name, see (1) next.
squid 1 Superconducting quantum interference device;
pair of Josephson junctions.
2 Semi-stable part-opened regime of parachute canopy,
normally encountered only at extreme airspeeds.
squidding Operation of parachute in squid position.
squint 1 Small angular error between actual and theoretical
direction of main-lobe axis or direction of
maximum radiation of radar or other directional emitter
(see * angle).
2 Operating mode of forward-looking radar or SAR in
which beam is steered to image object obliquely, ahead of
or behind platform.
squint angle 1 Maximum angle away from missile axis at
which homing head (IR, radar, EO, etc) can acquire and
lock on to normal emitting point target at significant
distance.
2 Angle of squint.
Squippers Safety-equipment fitters (colloq.).
squirrel cage 1 Air-combat dogfight (colloq.).
2 Induction motor whose rotor comprises axial bars
joined to rings at each end, pulled round by rotating field.
squirt Jet aircraft (colloq., c 1942-48).
squitter 1 Filler pulses transmitted by transponder
between interrogations.
2 Spontaneous transmission generated once per
second, without interrogation.
3 Random pulse pairs generated as fillers.
SQL Structured query language.
Sql Squelch.
SQP Signal-quality parameter.
SR 1 Short-range.
2 Search rate.
3 Sunlight-readable.
4 Special rules.
5 Single rotation.
6 Sortie rate.
SRG
7 Strategic reconnaissance, role designator (US),
originally transposition of RS (recon/strike).
8 Sunrise.
9 Service report, or request.
10 Solid rocket.
11 Slow-speed route (FAA).
12 Switched reluctance (see SRMG, SRSG).
13 Shear rate.
14 Staff requirement [(A) adds Air].
15 Stopped-rotor [adjective].
16 Statistical reporting.
17 Spherical radius.
sr Steradian.
SRA 1 Special-rules area, or airspace.
2 Shop-replaceable, or repair, assemblies.
3 Surveillance radar approach (CAA).
4 Spin reference axis.
5 Specialized repair activity (DoD).
6 Surveillance and reconnaissance aircraft.
7 Strategic Research Agenda (Acare).
SRAA Short-range air-to-air, M adds missile, W warfare;
but see next.
SRAAW Short-range anti-armour weapon (UAV).
SRADD Software requirements and design description.
SRALT Short-range air-launch target (USN).
SRAM 1 Short-range attack missile.
2 Static, or strategic, random-access memory.
SRARM Short-range anti-radiation (or radar) missile.
SRB Solid-rocket booster.
SRBM Short-range ballistic missile.
SRBOC Super-rapid-blooming offboard chaff.
SRBS Skeletal reference baseline simulator (SDI).
SRC 1 Science Research Council.
2 Secondary radar code.
3 Sample return container, or capsule [spaceflight].
4 Surveillance-radar computer.
5 Spoiler ratio changer.
SRCC 1 Structures Research Consultative Committee
(SBAC).
2 Standard radar-control console (NATO).
SRCU Secure remote-control unit.
SRD 1 Short-range diversion.
2 Service-revealed difficulty.
3 Systems requirements document.
SRDE 1 Signals Research & Development
Establishment [Christchurch, now closed] (UK).
2 Search-radar data extractor.
SRDS Systems Research and Development Service
(FAA).
SRE Surveillance radar element; portion of GCA.
S ref Reference area.
SREJ Selective reject.
SREM Software requirements engineering methodology.
SRF 1 State-rate feedback [IMF adds implicit mode
following].
2 Soft-copy reference folder.
SRFCS Self-repairing flight-control system.
SRFP Sunlight-readable flat panel; D adds display.
SRFW Schweizerische Rettungsflugwacht ( = GASS)
(Switzerland).
SRG 1 Safety Regulation Group (UK CAA).
2 Short-range.
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