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lobe nozzle
lobe nozzle Jet-engine nozzle with mixing promoted by
long multi-lobe periphery, resembling petals.
lobe switching Radio D/F by time-variant switching of
aerial [antenna] radiation pattern.
LOBL Lock-on before launch.
Lobstar Low-band structural array, principally for
[radar] foliage penetration (AFRL).
LOC 1 Line of communication.
2 Letter[s] of credit.
3 Logistics operations centre.
4 Limited operational capability.
5 Level of capability.
6 Location, locator (ICAO).
7 Local-operations console.
8 Limiting oxygen content, minimum to sustain
combustion.
9 Loss of control; IF adds in-flight.
10 See next.
loc Localizer.
LOCAAS, Locaas 1 Lo-observable comprehensive
autonomous attack system.
2 Low-cost anti-armor submunition (USA).
3 Low-cost autonomous attack system (USN).
local-area augmentation System, also called scheme, for
use of GPS guidance as principal blind landing aid,
replacing ILS (FAA).
local area network Bus, ring, PABX (telecommunications)
or other transmission links for communication and
EDP within an office, factory or other establishment.
local camber Distance measured perpendicular to chord
line from chord line to camber line.
local elastic instability Small region of buckling in otherwise
almost undistorted structure.
local hour angle, LHA Hour angle of observed body
measured relative to observer’s meridian.
localizer ILS aerial [antenna] and beam giving directional
[azimuth] guidance.
localizer course Locus of points in any horizontal plane
at which DDM is zero.
localizer needle Directional steering needle on ILS
display.
localizer protected area No aircraft or vehicles permitted
to enter.
local Mach number Actual Mach number at a point just
outside boundary layer of aircraft or other vehicle. See
local-surface airspeed.
local magnetic effects Those peculiar to a region (eg ore
deposits) which distort terrestrial field.
local mean time, LMT Angle at celestial pole between
local meridian and that of mean Sun; time elapsed since
mean Sun’s transit of observer’s anti-meridian.
local meridian That passing through a particular place.
local oscillator Radio circuit generating RF with which
received waves are combined.
local stress concentration Intensification caused by
shape of stressed part (eg at end of a crack).
local-surface airspeed TAS+V L where V L is increment.
[usually positive] induced by body’s shape.
local thickness In an aerofoil, distance between lower
and upper surface measured prependicular to camber line
[some authorities insist to chord line].
local traffic Visible from tower.
local velocity Relative speed of fluid flow over small area
of body, essentially = local-surface airspeed.
lockwiring
local vertical Line from centre of Earth through a
particular place.
Locap Lo combat air patrol.
Locat Low-cost aerial target, or trainer.
Locate Loran/Omega course and tracking equipment.
location bearings Ball or tapered-roller bearings which
determine the axial position of a shaft.
location indicator Identification code [usually four
letters] of aeronautical fixed station (ICAO).
locator 1 L/MF NDB used as fix for final approach.
2 Portable radio beacon 121.5/243 MHz, carried on
person or in parachute harness, sometimes with voice
facility.
LOC-BC, loc-BC Localizer backcourse.
LOCC Launch, or lander, operations control centre.
LOCD Low-cost dispenser.
LOCE 1 Limited operational capability [for] Europe,
see next.
2 Linked operations and intelligence centres, Europe
3 Large optical communications experiment.
LOC-I See LOCIF.
Locid Location identifier.
LOCIF Loss of control in flight [also LOC-I].
LOC inertia smoothing Extra AFCS function, usually
customer option, added in FCCs to alleviate effect of ILS
localizer noise. Typically Setting 1 smoothes approach
and provides survival after LOC failure below 100 ft/30 m;
Setting 2 reduces minima on Cat II or III ILS.
Lockclad Conventional 7 × 7 control cable covered with
swaged aluminium envelope.
locked 1 Gun bolt or breech block mechanically locked
to barrel at moment of firing.
2 Flight controls mechanically locked to prevent
damage by wind when parked; must be unlocked for
flight.
3 Overbalanced flight-control surface driven to limit of
deflection and not (or not readily) recoverable.
4 Carrier flight deck is for any reason not usable for
flying.
locked-in-condition Aircraft in dangerous flight condition
(eg superstall) with airflow over controls
inadequate for recovery to be possible.
locking pin Various, especially inserted in MLG/NLG
to prevent retraction on ground.
locking wire Fatigue-resistant wire pulled through ad
hoc holes in series of nuts or other rotary fasteners and
finally tightened and twisted off with inspector’s stamp on
soft metal seal at free ends.
Lock number Value [usually about 8] for ratio of inertia
to aerodynamic forces in helicopter rotor, symbol γ.
lock nut One that cannot loosen once tightened.
lock-on 1 Operating mode of many radars and other
sensor systems in which pencil beam, having searched and
found a target, thereafter remains pointing at that target.
2 When DME receives replies to 50+ per cent of
interrogations.
lock time Time from release of gun sear to firing of
primer or detonator.
lock up Lock on. Used esp. in airborne self-test of radar
against other member of formation.
lock washer Tightened under nut, prevents nut working
loose (by biting into nut or by a tab manually turned up
beside a flat on the nut).
lockwiring Preventing rotation of nuts or bolts by
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