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sea disturbance
sea disturbance See sea state.
seadrome Floating aerodrome for refuelling
transoceanic aeroplanes [unrealised idea 1931 –39).
Seafac Systems engineering avionics facility.
sea fog Fog over sea usually caused by moist air over
cold water.
SEAGA Selective employment of ground and air alert
(SAC).
Seagull EDP for flight simulators using distributed
computers linked by reflective-memory bus (Rediffusion/
Gould).
SEAL Sea/air/land.
sea lane Area of water with fixed markers showing its
use by marine aircraft.
sealant Material tailored to particular duty of ensuring
fluid-tight [liquid or gas] seal between mating materials;
often applied as continuous layer, eg inside integral tank.
Sealdrum Portable, collapsible rubber container for
POL, water and other liquids (US Royal).
sealed Officially closed, eg by lock wire with lead seal,
until completion of particular flight or test programme.
sealed-balance control Flight-control surface whose gap
between the leading edge [ahead of the hinge] and the fixed
surface is made airtight by flexible strip.
sea level 1 Actual height of sea surface, used as local
height reference.
2 More often, height corresponding to pressure of
1,013.25 mb.
3 In UK, referred to mean high-water at Newlyn,
Cornwall.
sea-level corrections See STP (1).
seam 1 Joint in fabric, eg overlap or three fell-types.
2 Unwanted flaw in deep-drawn metal tubing.
sea marker Anything dropped on sea to provide visible
indication of drift.
sea-motion corrector See sea-surface correction.
seam weld Continuous, hopefully pressure-tight, weld
made by roll electrodes; in theory can be accomplished by
close repeated spot welding or by hand process, but
unusual.
SEANC South-East Asia Notam centre.
SE&I Systems engineering and integration.
Seapac Sea-activated parachute automatic crew release.
seaplane 1 Float seaplane, marine aircraft having one,
two or [rarely] more separate floats and conventional
fuselage (UK).
2 Marine aircraft of any fixed-wing powered type (US).
seaplane basin 1 See towing tank.
2 Some dictionaries define this as a place having
sheltered water for seaplanes.
seaplane marker Buoyant or bottom-fixed marker at
marine aerodrome, also called taxi-channel marker.
seaplane rating Endorsement on licence qualifying
holder to fly or maintain seaplanes.
seaplane tank See pitching tank, towing tank.
seaplane trim Angle between mean water surface and
aircraft longitudinal axis or other reference when parked
on water.
sear Generalized term for catch, pawl or other latching
device which holds breechblock or bolt of gun at open
position.
sea rating See sea state.
search 1 Systematic reconnaissance of defined area such
that all parts pass within visibility.
SEC
2 DME mode: emit interrogation pulse pair and scans
whole operating area for reply.
search and rescue facility One responsible for maintaining
search and rescue service for persons and property
in distress.
search jammer Automatic jammer.
searchlight Any powerful directional surface light for
illumination of cloudbase or other aerial objects.
searchlight scanning Sector scanning (see scan types).
search mission Air reconnaissance to search for specific
surface object(s).
search radar Vague; generally means surveillance radar
operating in search mode, and often applied to weather
radar.
search rate Reciprocal of average time to search one PN
chip-width, ie chips/s (ECM).
sea return See clutter.
Sears’ function S(k g ), deals with a helicopter rotor
traversing a sinusoidal gust field, encounter frequency
k g = π V/λ g where λ g is gust wavelength.
Sears-Haack Profile of body having minimum supersonic
drag, normally body of revolution having pointed
ends and fineness ratio appropriate to Mach number;
complicated by addition of aerofoils.
SEARW Single-engine advanced rotary wing.
seasat Generalized name for oceanographic satellite.
sea smoke See steaming fog.
sea state Condition of sea surface as related to standard
list of reference conditons, invariably Beaufort scale.
sea-surface correction Electronically applied correction
to Doppler output to remove false velocities due to
motions of waves.
SEAT 1 Site-equipment acceptance test.
2 Status evaluation and test.
Seat Single-engine air tanker (USFS).
seat belt Single quick-release belt across bottom of
torso for passenger.
seat harness Arrangement of four or five adjustable
straps keeping occupant in place in violent manoeuvres
[military or aerobatic aircraft].
SEATO Pronounced Seato, SE Asia Treaty
Organization, 1954-76.
seat pack Parachute pack worn in such a way that it
forms seat cushion.
seat selection Offering customer for particular commercial
flight right to select seat from those remaining,
subsequently shown on boarding pass.
seat-type parachute One with seat pack.
SEB 1 Staphylococcus enterotoxin B, BW agent.
2 System[s] electronics box.
Sebass Spatially enhanced broadband Army spectrographic
system (USA).
SEBRW Single-engine basic rotary wing.
SEC 1 Secondary emission cathode.
2 Secondary-electron conduction.
3 Securities and Exchange Commission (US).
4 Secondary (NASA).
5 Spoiler and elevator computer.
6 Security [problems] working group (ECAC).
7 Special-event charter.
8 Section, or sectional aeronautical chart.
9 Sector.
10 Survivable engine control.
11 Software-enabled control (AFRL-Darpa).
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