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LTA
LTA 1 Lighter than air.
2 The Lighter-Than-Air Society [Akron, OH] (US).
3 Light transport aircraft.
4 Light tactical aircraft.
5 Long-term agreement.
6 Limited, or Lunar Module, test article.
LTAC Light tactical airlift capability.
LT&E Logistics testing and evaluation.
LTAS See The LTAS.
LTB Aircraft maintenance facility (G).
LTBT Limited Test-Ban Treaty.
LTC 1 Long-term costing, or contract.
2 Lithium thionyl chloride (electric battery).
3 Limited Type Certificate.
4 Lowest two-way channel.
LTCC Low-temperature co-fired ceramic.
LTD Laser target designator.
Ltd Limited company (UK).
LTDP Long-term defence plan (NATO).
LTD/R Laser target designator/ranger.
LTDS Laser target designator set.
LTE 1 Loss of tail-rotor effectiveness.
2 Landline telephony.
3 Laser-tracker equipment, of aircraft in checking ILS.
LTF Learn[ing] to fly.
LTFRS Lantirn TFR system.
LTG Lightning [CA adds cloud-to air, CC cloud-tocloud,
CCCG cloud/cloud/ground, CG cloud-to-ground,
CW cloud-to-water, IC in clouds].
Lt Ho Lighthouse.
LTI Linear and time-invariant.
LTIT Low [-pressure] turbine inlet temperature.
LTKh Flying qualities (ICAO).
LTL, ltl 1 Little.
2 Lateral.
LTM 1 Load ton-mile.
2 Laser target marker.
3 Landsat thematic mapper.
4 Livestock transportation manual.
LTMA London terminal control area.
LTMP Low-temperature microgravity physics; F adds
facility (ISS4).
LTMR Laser target marker and receiver.
LTO 1 Landing and takeoff, especially a standard cycle
(ICAO).
2 See LTOs.
LTOF Low-temperature optical facility.
LTOs Letters to owners/operators (CAA).
LTP 1 Laboratorio de Tecnologia de la Propulsión
(Spain).
2 Longitudinal touchdown point.
3 Left top plug.
LTPA Long-term partnering agreement.
LTPB Linear-token passing bus.
LTPG Long-term planning guidelines (NATO).
LTPN Tone-corrected perceived noise level, now judged
of doubtful value, to account for intense tones, eg due to
rotating fan and compressor blades.
LTPT 1 Low-turbulence pressure tunnel.
2 Linear-token-passing topology.
LTR 1 Loop transfer recovery (EDP methodology).
2 Later.
3 Linear-token ring.
LTR[S] Improper abb. litre[s].
Luneberg lens
LTS 1 Load and trim sheet.
2 Landing threshold speed.
3 Lantirn targeting system.
4 Lights.
5 Link translator system.
6 See Litas.
LTSA Long-term service agreement.
LTSS Long-term software support [P adds programme].
LTT 1 Landline teletypewriter.
2 Lead tin telluride.
LTU Laser transceiver unit.
LTV Load threshold value.
Lt V Light vessel.
L 3 TV Low-light-level TV.
LTWA Long trailing wire aerial, or antenna.
LTWTA Linear, or linearized, travelling-wave tube
amplifier.
LU Logic(al) unit.
LUA Launch under attack.
lubber line Reference index, usually parallel to aircraft
longitudinal axis, eg on compass, denoting aircraft
heading.
Lubbock burner Pioneer [1940] atomising burner for
turbojets, devised by Isaac Lubbock; featured a sliding
piston which controlled inlet ports to a swirl chamber.
lube Lubricating oil (US, colloq.).
lubricating oil In general, piston engines still use mainly
mineral oils and gas turbines ester-based “synthetics”,
over 1,000 national and international [e.g., NATO] specifications
are in current use.
Lucero Ground beacon keyed to 1.5 m AI or ASV
radars, 1942-57.
Lucid Software package for processing image data from
all forms of visual sensor.
Lucite Resin produced from methyl methacrylate,
widely used for transparent plastics.
LUF Lowest usable frequency.
Lufbery circle Military ring formation in which all
aircraft fly gentle turn following that in front.
Luftfartsverket CAA (Norway), met. services (Sweden).
LUH Light utility helicopter.
luhf Lowest usable high frequency.
lumen SI unit of luminous flux; lm = cd.sr (candelasteradian).
luminance Brightness; intrinsic luminous intensity;
illuminance on unit surface normal to radiation divided
by subtended solid angle L = cd m -2 .
luminescence Non-thermal emission of light, ie not
incandescence but electro-*, phosphorescence, chemi-*
and photo-* (fluorescence).
luminous flux Light emitted in solid angle of 1 steradian
by point source of luminous intensity 1 cd, symbol Φ, unit
lumen; thus lm = cd.sr.
luminous intensity Luminous energy per unit solid angle
per second; unit candela, cd. A basic SI unit.
lunar boot Astronaut footwear tailored to surface of
Moon.
lunar orbit Orbit round the Moon.
lunar orbital rendezvous Lunar exploration by descent
stage detached from larger spacecraft left in lunar orbit
and which is rejoined for return to Earth.
Luneberg lens Device, often spherical, designed for
maximum reflectivity of radar energy back along incident
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