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lusec
path, tailored to wavelength; an enhancing corner
reflector.
lusec Lumen-second, quantity of luminous energy.
LUT 1 Local-user-terminal [SAR satellites].
2 Limited user test.
3 Launch[er] umbilical tower.
lux SI unit of illuminance; lx = lm/m 2 .
LV 1 Local vertical.
2 Lower [sideband] voice.
3 Low volume (crop spraying).
4 Light and variable.
5 Launch vehicle.
l¯v Moment arm of vertical tail, usually measured from
25% MAC.
L/V 1 Local vertical.
2 Lead/vinyl.
lv Rolling moment coefficient due to sideslip.
L+V Leather and vinyl.
LVA 1 Large vertical aperture (radar).
2 Log video amplifier.
LVAT Layered voice analysis technology.
LVB Luftverkeersbeveiliging, ATC authority (Netherlands).
LVD Low-velocity detection.
LVDT 1 Linear voltage differential transducer.
2 Linear variable differential (or displacement) transformer,
a precise indicator of position.
LVE Leave, leaving.
LVER Low-voltage electromagnetic riveter.
LVFE Long variable-flap ejector (supersonic nozzle).
LVFR Low-visibility flight rules.
LVIS Low-voltage ignition system.
LVL Level.
LVLCH Change in FL.
LVNL Civil ATC (Netherlands).
LVO Low-visibility operations.
LVOR Low-altitude VOR.
LVP Low-visibility procedures.
LVPS Low-voltage power supply.
LVT Low-volume terminal (MIDS/JTIDS).
LVTO Low-visibility take off.
LW 1 Littoral warfare.
LZS
2 Landing weight [needs explanation].
3 Long-wave.
L W Sound power level; usually measured in ⅓-octave
bands and can be measured in dB or W.
l.w. Long wave.
l W Longitudinal distance between aeroplane centre of
gravity and centre of lift.
LWA Laser warning analyser.
LWABTJ Lightweight afterburning turbojet.
LWAD Littoral warfare advanced development.
LWBT Total lift of wing/body/tail.
LWC 1 Light-water concentrate (firefighting foam).
2 Liquid-water content.
LWCCU Lightweight common control unit.
LWD Lowered.
LWF Light-weight fighter.
LWIR Long-wavelength IR.
LWL Load waterline.
LWLD Lightweight laser designator.
LWMMT Low water mark mean tides.
LWP Light window pintle.
LWR 1 Luftwaffenring eV (G).
2 Laser warning receiver.
3 Lower, or lowering.
LWS Laser warning system.
LWSS Lightweight sound system [helo sonar].
LWTR Licence with type rating.
lx See lux.
Lyapunov equations Linear quadratic equations
containing solutions to LQR, typically including g
A T P+PA c .
Lychgate Multimedia data system linking RAF, MoD
and other services (UK).
Lyman-Alpha Radiation emitted by hydrogen at
12.16 pm (1,216 Å), penetrates Earth atmosphere to base
of D-region (90 km, 55 miles).
LYR Layer.
LYRD Layered.
LYRS Layers.
LZ Landing zone (assault in land battle).
LZE Luminous-zone emissivity (flare, IRCM).
LZS Aeronautical association (Slovenia).
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