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L
L 1 Characteristic length of body; also used for linear
spacing of frames, alternative to b.
2 Total lift, or section lift of helicopter rotor.
3 Sound pressure level, see Noise.
4 Inductance; unit, henry.
5 Luminance, brightness.
6 Distance to applied load.
7 Low (navaid category), under 18,000 ft and En
Route Low-altitude chart (FAA).
8 Low (synoptic chart).
9 Rolling moment.
10 Countermeasures (JETDS).
11 Lighted (airfield).
12 Code: IFR aircraft has DME and transponder.
13 Fighter designation prefix, low-altitude (UK,
WW2).
14 Aircraft category, glider (prefix, USN, 1941–45),
liaison (USAF from 1942, USN from 1962).
15 Modified-mission, cold-weather (prefix USAF,
USN), searchlight carrier (USN until 1962).
16 Left (ident of parallel runway).
17 Lower wing.
18 Angular momentum.
19 In-line (piston engine).
20 Drizzle (ICAO).
21 Latitude.
22 Light (turbulence).
23 Locator.
24 Licensed airport.
25 Cleared to land.
26 Local.
27 Launch time of mission.
28 Low-intensity [airfield lighting].
29 Level [fluid].
l 1 Litre[s].
2 Aerofoil section lift.
3 Length of beam, or aircraft overall length, or length
of influencing vortex filament.
4 Distance from c.g. of aeroplane to c.p. of horizontal
tail.
5 Stagnation line.
6 Terrestrial longitude.
7 Subscript, lower surface.
L – Average peak sound pressure level.
L Section lift of 2-D aerofoil [lift per unit span, normal
to freestream].
(L) Lower-airspace radar service, preceded by
frequency.
L1 L-band carrier 1,575.42 MHz (GPS).
L2 L-band carrier, 1,227.6 MHz (GPS).
L2CS Two GPS codes, one with navigation data, for
improved accuracy for civil users.
L3TV, L 3 TV Low-light-level TV.
L5 Third civil GPS frequency at 1,176 MHz, to be introduced
2005.
L 300/600 Sound pressure level for octave band 300/600
Hz, see noise.
L-band See Appendix 2.
L-display Central diametral timebase (usually vertical)
on which appear transmitter and target blips at position
giving range and offset according to pointing error.
LA 1 Lighter than air.
2 Launch azimuth.
3 Loiter altitude.
4 Limited authority.
5 Lietuvos Aeroklubas (Lithuania).
6 Latvijas Aeroklubs (Latvia).
La Lanthanum.
L A A-weighted sound pressure level, see noise.
LAA 1 Light anti-aircraft gun or gunfire.
2 Low-altitude airspace.
3 Local-airport advisory.
4 Lowest acceptable altitude.
5 Low-altitude alert [S adds system].
6 Laboratory of Applied Anthropology.
7 Lateral accelerometer.
8 Light Aircraft Association [Turweston Aerodrome,
Brackley, NN13 5YD] (UK).
LAAAS, LA 3 S Low-altitude airfield-attack system.
LAAD Low-altitude air defence; S adds system.
LAADR Low-altitude airway departure route.
LAA/DR Low-altitude arrival/departure route.
LAANC Local Authorities Aircraft Noise Council
(UK).
LAAP Low-altitude autopilot.
LAAS 1 Laboratoire d’Automatique et d’Analyse des
Systèmes (F).
2 Low-altitude attack, or alert, system.
3 Local-area augmentation system, or scheme,
proposed as GPS-based successor to ILS (FAA).
LAASH Litef analytical air-data system for helicopters.
LAAT Laser-augmented airborne TOW.
LAAV Light airborne ASW vehicle.
LABRV Large advanced ballistic re-entry vehicle.
Labs Low-altitude bombing system (guidance for
upward toss of NW).
labyrinth seal Gas seal between fixed and moving parts
comprising series of chambers which, though their sides
do not quite touch, reduce gas escape close to zero.
LAC 1 Leading Aircraftman (RAF, obs.).
2 Low-altitude en route chart.
3 List of assessed contractors.
4 Lebanon Aero Club.
LACAC Latin American Civil Aviation Commission
[from 1969].
LACC London Air Control Centre.
Lace 1 Laser airborne communications experiment.
2 Liquid air cycle engine.
3 Low-power atmospheric compensation experiment.
4 Local adpative contrast enhancement.
Lacie Large-area crop inventory experiment.
lacing 1 Process of intermittent wrapping to join wire
bundle into tight loom.
2 Stitching fabric to aircraft structure.
3 Threading wire through holes drilled at same location
in every blade of a fan or turbine rotor to damp vibration.
lacking moral fibre Condition, often unfairly diagnosed,
which resulted in aircrew being instantly removed from
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