Pilot/Controller Glossary

LATERAL NAVIGATION (LNAV)" A function of
area navigation (RNAV) equipment which calculates,
displays, and provides lateral guidance to a profile or
path.
LATERAL SEPARATION- The lateral spacing of
aircraft at the same altitude by requiring operation on
different routes or in different geographical locations.
(See SEPARATION.)

LDA-
(See LOCALIZER TYPE DIRECTIONAL AID.)
(See LANDING DISTANCE AVAILABLE.)
(See ICAO Term LANDING DISTANCE
AVAILABLE.)

LF-
(See LOW FREQUENCY.)

LIGHTED AIRPORT- An airport where runway and
obstruction lighting is available.
(See AIRPORT LIGHTING.)
(Refer to AIM.)

LIGHT GUN- A handheld directional light signaling
device which emits a brilliant narrow beam of white,
green, or red light as selected by the tower controller.
The color and type of light transmitted can be used to
approve or disapprove anticipated pilot actions where
radio communication is not available. The light gun
is used for controlling traffic operating in the vicinity
of the airport and on the airport movement area.
(Refer to AIM.)

LIGHT-SPORT AIRCRAFT (LSA)- An
FAA-registered aircraft, other than a helicopter or
powered-lift, that meets certain weight and
performance. Principally it is a single-engine aircraft
with a maximum of two seats and weighing no more
than 1,430 pounds if intended for operation on water,
or 1,320 pounds if not. It must be of simple design
(fixed landing gear (except if intended for operations
on water or a glider), piston powered,
nonpressurized, with a fixed or ground adjustable
propeller). Performance is also limited to a maximum
airspeed in level flight of not more than 120 knots
calibrated airspeed (CAS), have a maximum
never-exceed speed of not more than 120 knots CAS
for a glider, and have a maximum stalling speed,
without the use of lift-enhancing devices of not more
than 45 knots CAS. It may be certificated as either
Experimental LSA or as a Special LSA aircraft. A

minimum of a sport pilot certificate is required to
operate light-sport aircraft.
(Refer to 14 CFR Part 1, 1.1.)

LINE UP AND WAIT (LUAW)- Used by ATC to
inform a pilot to taxi onto the departure runway to line
up and wait. It is not authorization for takeoff. It is
used when takeoff clearance cannot immediately be
issued because of traffic or other reasons.
(See CLEARED FOR TAKEOFF.)

LOCAL AIRPORT ADVISORY (LAA)- A service
available only in Alasknd provided by facilities
that are located on the landing airport, have a discrete
ground-to-air communication frequency or the
tower frequency when the tower is closed, automated
weather reporting with voice broadcasting, and a
continuous ASOS/AWOS data display, other continuous direct reading instruments, or manual
observations available to the specialist.
(See AIRPORT ADVISORY AREA.)

LOCAL TRAFFIC- Aircraft operating in the traffic
pattern or within sight of the tower, or aircraft known
to be departing or arriving from flight in local practice
areas, or aircraft executing practice instrument
approaches at the airport.
(See TRAFFIC PATTERN.)

LOCALIZER- The component of an ILS which
provides course guidance to the runway.
(See INSTRUMENT LANDING SYSTEM.)
(See ICAO term LOCALIZER COURSE.)
(Refer to AIM.)

LOCALIZER COURSE [ICAO]- The locus of
points, in any given horizontal plane, at which the
DDM (difference in depth of modulation) is zero.
LOCALIZER OFFSET- An angular offset of the
localizer aligned within 3_ of the runway alignment.
LOCALIZER TYPE DIRECTIONAL AID (LDA)-
A localizer with an angular offset that exceeds 3_ of
the runway alignment, used for nonprecision
instrument approaches with utility and accuracy
comparable to a localizer, but which are not part of a
complete ILS.
(Refer to AIM.)

LOCALIZER TYPE DIRECTIONAL AID (LDA)
PRECISION RUNWAY MONITOR (PRM)
APPROACH- An approach, which includes a
glideslope, used in conjunction with an ILS PRM,
RNAV PRM or GLS PRM approach to an adjacent
runway to conduct Simultaneous Offset Instrument