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low bidder
low bidder Manufacturer offering lowest price in
industry competition.
low blower See low supercharger gear.
low blown Piston engine supercharged for maximum
powers at low altitudes at expense of poor performance at
height.
low boss VSV inner bearing.
low cloud Cumulus, cumulonimbus, stratocumulus,
stratus and nimbostratus; base generally below 1,800 m,
5,900 ft.
low-cycle fatigue Fatigue caused by changes in material
stress resulting from changes in speed of rotating
machines; from idling to take-off power and back to
cruise rpm could represent single completed cycle.
low density, high demand Assets [e.g. aircraft] available
only in small numbers but needed in all theatres.
low Earth orbit Below 2,000 km (1,243 miles), see low
orbit.
lower airspace No single definition; FAA usually below
14,500 ft AMSL, but see next.
lower airspace radar advisory service Provided on
request to local (say, within 50 km, 30 miles) uncontrolled
traffic from 3,000 ft up to FL95 (CAA, UK).
lower-deck container ULD shaped to fit underfloor
space, either full- or half-width.
Lower DFL Lowest divisional flight level, expected to be
FL100.
lower heating value Net calorific value of fuel.
lower-level gearbox In a large turbofan, this transmits
the drive from the angled input shaft to the accessory
gearbox.
lower rotating ventral door Chief pivoted member
forming underside of D (or 2-D) nozzle.
lower sideband Difference in frequency between modulation
signal and AM carrier.
Lowest Light occupant weight ejection-seat test.
low flying Flight at minimum safe (sometimes unsafe)
altitude for training or sport.
low-flying area Geographical region within which low
flying is authorized for training.
low frequency Generally defined as 30-300 kHz.
low gate Mechanical stop on piston-engine throttle box
beyond which further opening inadvisable below rated
height or other altitude limit.
low inclination mission Satellite inclination less than 30°
to Equator (eg 28.6°).
low-lead Petrol [US, gasoline] containing typically 2
ml/gal, 1.66 ml/US gal, of TEL.
low-level discomfort factor Usually measured as number
of vertical accelerations exceeding specified level (0.5 g)
experienced by occupants per minute.
low-level parachute Rapid automatic opening for precision
delivery of fragile loads.
low-light TV Vidicon tube with multiplier tubes giving
useful picture in near-darkness.
low-light-level TV Generally used for same EO devices
as preceding entry.
low loader Ground vehicle designed for attaching load,
e.g., cruise missile or NW, under carrier aircraft.
low/mid wing Mounted about one-third way up body.
low oblique Photography from lo altitude at oblique
angles to either side, not vertical or ahead.
low observables Stealth.
low orbit Nominally, period 90 min or less.
LPB
low-pass filter Designed to cut off all signals above given
frequency.
low pitch See coarse pitch.
low-pressure compressor The first compressor downstream
of the inlet [or fan, if fitted] in an engine with two
or more shafts.
low-pressure fuel pump That mounted in or on the fuel
tank.
low route Area-navigation routes not dependent on
navaid-based airways, for low-level traffic, MAA (3)
4,000 ft AMSL (FAA).
low rudder In tight turn, or other occasion with wings
near-vertical, depressing pedal nearest ground to lower
nose.
low silhouette Squat aircraft, esp. in frontal aspect, easy
to hide on battlefield (usually anti-tank helicopter).
low situational awareness Criticism of combat pilot,
failure to correlate several kinds of simultaneous input.
low-speed aerodynamics Not defined; below 100 ft/s has
been suggested.
low-speed aircraft Several attempted definitions; UK
CAA and FAR.91 do not define.
low-speed stall Normal 1 g stall.
low supercharger gear Lower of two gears in two-speed
supercharger drive.
low tow Towing a glider, especially over a long distance,
at an altitude lower than the tug.
low vacuum Pressure below 101.247 kPa (760 torr) and
above some lower level usually agreed as 3.33 kPa (26
torr).
low-velocity drop Paradrop or other drop with velocity
below 30 ft/s (DoD, NATO).
low-visibility operations Not defined; usually taken as
0.3 n.m. RNP.
low-visibility procedures Adopted by airport controllers
in visual control room [vary according to airport and
RVR].
low wing Mounted low on body, usually so that undersurfaces
approximately coincide.
lox Liquid oxygen.
loxodrome See rhumb line.
loxygen Liquid oxygen (arch.).
loz Liquid ozone.
LP 1 Low pressure; in an axial compressor or turbine a
suffix number indicates the stage, thus: LP4.
2 Licensing panel.
3 Low-pass filter (often 1.p.).
4 Liquid propellant.
5 Launch platform.
6 Low-power.
7 Linear polarization.
8 Lightweight protocol.
9 Log Periodic.
10 Landing point.
Lp Sound pressure level, usually measured over ⅓-
octave or at a discrete frequency.
l¯p Rolling moment coefficient due to rolling.
LPA 1 Laboratoire de Physique de l’Atmosphere (F).
2 Linear power amplifier.
LPAR Large phased-array radar (Soviet ABM).
LPATS Lightning position and tracking system.
LPB 1 Loss Prevention Bulletin; each issue lists over
20,000 stolen airline ticket numbers (IATA).
2 Low-pressure [shaft] bearing.
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