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LACM
operations, and in most cases losing brevet and rank
(RAF – WW2).
LACM Land-attack cruise missile.
Lacors Local Authorities Co-ordinators of Regulatory
Services (UK).
lacquering Gradual but irreversible deterioration of fuel
left to soak in a spray nozzle or similar hot part [so such
places are purged].
Lacta Light-air-cushion triphibious aircraft.
LACW Leading Aircraftwoman (WRAF).
LAD 1 Laser acquisition device.
2 Large-area display.
3 Low-altitude dispenser.
4 Local-area differential [GPS, GNSS can be suffixed].
5 Launch-assist device.
ladar See lidar.
LADD Low-altitude (or angle) drogue delivery.
ladder network Cascade of electrical sub-circuits each
controlled by its predecessor (central to test equipment).
LADF Lift-augmented ducted fan.
LADGNSS Local-area differential GNSS.
LADGPS Local-area differential GPS.
lading Placing load on aircraft, including bar stocks and
food trollies, excluding passengers and fuel.
Lado, LADO Launch, anomaly and disposal operations
(Navstar).
LADS, Lads 1 Lightweight air-defence systems.
2 Laser airborne depth sounder, for charting seabottom
depth to assist in-shore ASW.
LAE 1 Low-altitude extraction (para-drop cargo).
2 Licensed aircraft engineer (SLAET).
LAEO Low-altitude electro-optics, or optical.
LAES Landing Aids Experiment Station (Arcata, CA,
from 1946).
LAF Load-alleviation function.
LAFT Light-aircraft flying task (RAF).
LAFTS Laser and FLIR test set.
lag 1 Angular crankshaft movement between a reference
position (TDC, BDC) and open/closure of a valve.
2 Angular movement of electrical vector between reference
position and current vector or other waveform.
3 Angular movement between helicopter main-rotor
hub and (temporarily slower) blade; hence * hinge, *
angle.
4 In instruments, eg VSI (1), normal meaning of delay.
5 In level bombing, horizontal distance between impact
point [or an intermediate air position] and that achieved
in vacuum.
Lageos Laser geodynamic satellite.
lag-plane damping Damping of fundamental mode of
rotor system; critical for suppression of various instabilities,
esp. ground and air resonance; expressed as % critical
damping in non-rotating condition.
Lagrangian co-ordinates Identify fluid parcels by
assigning each a series of time-invariant co-ordinates
such as transient spatial position. Constant-pressure
meteorological balloon observations are Lagrangian.
Lagrangian points Five positions in space where free
body could maintain station with respect to satellite in
existing two-body (eg Earth/Moon) system.
LAH Light attack helicopter.
Lahat Laser-homing anti-tank.
Lahaws, LAHAWS Laser homing and warning system.
LAHC Lincolnshire Aviation Heritage Centre.
Lance
LAHRS Low-cost attitude/heading reference system.
LAHS 1 Low-altitude high-speed route; military VFR
training (US).
2 Land and hold short; O adds Operation.
LAI Lean aerospace [or aircraft] initiative.
LAIRCM Large-aircraft IRCM.
Lairs 1 Large-aperture IR sensor.
2 Lightweight advanced imaging radar system.
3 Light-aircraft reconnaissance system.
LAL Launch and leave.
Lα Lift due to angle of attack (aircraft attitude), hence
L α WB = lift of blended wing/body due to α.
LALS Linkless ammunition loading system.
LAM 1 Long aerial mine (hence codename Mutton).
2 Loiter[ing] attack missile, or munition [-A adds aviation].
3 Logical acknowledgement message.
4 Laser additive manufacturing.
LAMA Light Aircraft Manufacturers’ Association
[office, Pleasanton, CA94588], (US).
Lamars Large-amplitude multi-mode aerospace
research simulator.
lambda foot Bifurcated shockwave near solid surface,
resembling Greek letter.
lambert Former unit of luminance, ––––
1
π cd/cm 2 ; thus 1
foot-lambert = 3.426 cd/m 2 .
Lambert projection Map projection of modified conical
type in which cone intersects Earth round two ‘standard
parallels’ of latitude.
LAME, Lame Line (or licensed) aircraft maintenance
engineer.
Lamilloy HP turbine cooling technology (former
Allison co.).
lamina Elementary (ie infinitely thin) slice.
laminar boundary layer Comprises successive laminar
layers, that adjacent to surface having zero relative
velocity and successive layers adding velocity out to the
free stream.
laminar flow Fluid flow in which streamlines are
invariant and maintain uniform separation, with perfect
non-turbulent sliding between layers.
laminated Made of thin layers bonded together.
LAMP, Lamp 1 Lockheed adaptive modular platform,
or payload,
2 Large advanced mirror program for space laser
(SDI).
3 Lyman-Alpha mapping project.
LAMPS, Lamps 1 Low-altitude multi-purpose system
(USAF).
2 Light airborne multi-purpose system (USN).
Lams, LAMS 1 Load-alleviation and mode stabilization.
2 Light-aircraft maintenance schedule, or scheme, for
aeroplanes 2,730 lb (1,238 kg) with 3-year C of A
(CAA, UK).
3 Local-area missile system (ship defence).
4 Local-area mission system.
LAMV Light aerial multipurpose vehicle.
LAN Local area network.
lan Inland.
LANA Low-altitude night attack.
Lance 1 Line algorithm for navigation in combat environment.
2 Launch and network control equipment.
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