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SCPL
SCPL Senior commercial pilot’s licence (no longer
issued).
SCPS Space communications protocol standard[s]
(DoD, NASA).
SCPU Suite central processing unit.
SCR 1 Silicon-controlled rectifier.
2 Signal/clutter ratio.
3 Stratified-charge rotary (engine).
4 Single-channel radio.
5 Selective chopper radiometer.
SCRA 1 Single-channel radio access.
2 See SCRIA.
Scramble 1 Take off as quickly as possible (usually
followed by course and altitude instructions) (DoD). Any
urgent call for military (usually combat) aircraft to take
off and leave vicinity of base, either as training manoeuvre
or for sudden operational reason.
2 To attempt to provide telecom security by rendering
transmission unintelligble to third parties (ie by scrambling),
eg by speech inversion.
Scramble Cancellation Order Vital order countermanding
an attack with NW.
scrambled egg Gilt rim round peak of Service-dress cap
of group captain and Air Ranks (RAF, colloq.).
scramble pan Dispersal from which fighter can make
immediate takeoff.
scramjet Supersonic-combustion ramjet; one in which
flow through combustor itself is still supersonic.
Scram/Lace Supersonic combustion ramjet, liquid air
cycle engine (NASA).
scrap 1 Workpiece containing defect, even trivial,
sufficient to cause it to fail an inspection.
2 To break up old unwanted aircraft or one beyond
economic repair.
3 Residue of (2) other than produce or salvaged items.
scraper ring 1 Spring piston-ring with sharp-angled
lower periphery for removing oil from cylinder wall.
2 Middle ring on squadron-leader badge of rank (RAF,
colloq.).
scrap view Small inset showing detail (eg item from
different viewpoint or in different configuration) added
where room permits on main drawing.
scratchbuilt Replica of historic aircraft containing no
authentic parts.
SC/RC Stratified-charge rotating-combustion engine.
SCRE Syndicat des Constructeurs de Relais Electriques
(F).
screaming Undefined term descriptive of highfrequency
combustion instability in rocket characterized
by high-pitched noise (see screeching).
screeching Undefined term describing high-frequency
combustion instability in rocket or afterburner characterized
by harsh, shrill noise more irregular than screaming.
screeding Levelling and smoothing resin adhesive in
bonding operation; hence * tool.
screen 1 Imaginary obstruction having form of level-top
wall normal to flightpath which aeroplane would just
clear on takeoff or landing with landing gear extended and
wings level.
2 Arrangement of ships, submarines and aircraft for
protection of ship(s) against attack (DoD).
3 Wire-mesh gauze or sieve (ASCC).
4 Electrically conducting or magnetically permeable
scrub
enclosure which shields either contents or exterior against
unwanted magnetic/electrical fields.
5 Face of electronic display, eg CRT, TV, projection
system, etc.
screen burn See ion burn.
screen captain Senior training or supervisory pilot in
role of examiner. May be employee of certification
authority.
screened Provided with screen (4), thus * ignition has
enveloping earthed conductive covering to prevent escape
of R/F interference.
screened horn Balance surface entirely downstream of
fixed surface.
screened pair Twin electric cable incorporating earthed
screen (4).
screener Airport X-ray machine, or person assigned to
probe baggage.
screen filter Fluid filter whose element is a fine metal
mesh screen.
screen grid Screen (3) between anode and control grid in
thermionic valve to reduce electrostatic influence of
anode.
screen height Height above ground of top of screen (1),
normally 35 ft (10.67 m), occasionally 10 m and rarely 50
ft, on takeoff; on landing usually 30 ft (often interpreted
as 10 m). Depends upon aircraft performance group and
particular case considered.
screening Meanings include: 1 Examining candidate as
fit to handle classified information. 2 Airport security
examination of passengers and baggage. 3 Screen (4).
screen navigator Carried in navigator training aircraft to
ensure safe return despite pupil errors.
screen speed Speed at moment aeroplane passes over
screen (see screen height), either assumed or as target
value, on takeoff or landing. Does not have V-suffix
abbreviation.
screw Generalized term for threaded connector rotated
into workpiece and not held by nut; many quick-fasteners
have *-thread and no sharp dividing line is possible.
screw gauge Hand instrument for measuring major
diameter of screw, typically by graduated line scales
forming small-angle notch.
screwjack Actuator having rotary input and linear
output obtained by screwthread, often with interposed
recirculating balls.
screw pitch gauge Hand instrument for checking thread
on metalworking screw or bolt, usually with selection of
blades each having one ‘threaded’ edge.
SCRIA Supply-chain relationships in aerospace.
scrieve board Portable board on which lofting lines are
recorded either by scribing or some other undeformable
method. Often used with locating blocks for actually
assembling flight hardware, eg frames, thus becoming a
jig. Becoming obsolete.
SCRJ Supersonic combustion ramjet.
scroll Any curved duct or guidance channel, especially
leading air out of centrifugal compressor or cooling air
across face of turbine disc.
SCRT Single-channel receiver/transponder.
scrub 1 To abandon project, esp. a planned flight or
military mission.
2 To eliminate a pupil from course of instruction,
following failure of * check.
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