faraim.org

Aeronautical Information Manual (AIM), page 669

12/10/15 Pilot/Controller Glossary

at least 750 feet. NTZ monitoring is required to
conduct these approaches.
(See SIMULTANEOUS OFFSET INSTRUMENT
APPROACH (SOIA).)
(Refer to AIM)
LOCALIZER USABLE DISTANCE- The maxi-
mum distance from the localizer transmitter at a
specified altitude, as verified by flight inspection,
which reliable course information is continuously
received.

(Refer to AIM.)

LOCATOR [ICAO]- An LM/MF NDB used as an aid
to final approach.
Note: A locator usually has an average radius of
rated coverage of between 18.5 and 46.3 km (10
and 25 NM).

LONG RANGE NAVIGATION-

(See LORAN.)
LONGITUDINAL SEPARATION- The longitudi-
nal spacing of aircraft at the same altitude by a
minimum distance expressed in units of time or
miles.

(See SEPARATION.)
(Refer to AIM.)

LORAN- An electronic navigational system by
which hyperbolic lines of position are determined by
measuring the difference in the time of reception of
synchronized pulse signals from two fixed transmit-
ters. Loran A operates in the 1750-1950 kHz
frequency band. Loran C and D operate in the
100-110 kHz frequency band. In 2010, the U.S. Coast
Guard terminated all U.S. LORAN-C transmissions.
(Refer to AIM.)

LOST COMMUNICATIONS- Loss of the ability to
communicate by radio. Aircraft are sometimes


referred to as NORDO (No Radio). Standard pilot
procedures are specified in 14 CFR Part 91. Radar
controllers issue procedures for pilots to follow in the
event of lost communications during a radar approach
when weather reports indicate that an aircraft will
likely encounter IFR weather conditions during the
approach.
at (Refer to 14 CFR Part 91.)
(Refer to AIM.)

LOW ALTITUDE AIRWAY STRUCTURE- The

network of airways serving aircraft operations up to
but not including 18,000 feet MSL.
(See AIRWAY.)
(Refer to AIM.)

LOW ALTITUDE ALERT, CHECK YOUR ALTI-
TUDE IMMEDIATELY-

(See SAFETY ALERT.)

LOW APPROACH- An approach over an airport or
runway following an instrument approach or a VFR
approach including the go-around maneuver where
the pilot intentionally does not make contact with the
runway.

(Refer to AIM.)

LOW FREQUENCY- The frequency band between
30 and 300 kHz.
(Refer to AIM.)

LPV- A type of approach with vertical guidance
(APV) based on WAAS, published on RNAV (GPS)
approach charts. This procedure takes advantage of
the precise lateral guidance available from WAAS.
The minima is published as a decision altitude (DA).

LUAW-
(See LINE UP AND WAIT.)


PCG L-3

Page 669 of the Aeronautical Information Manual (AIM.pdf)
AIM: Official Guide to Basic Flight Information and ATC Procedures

Index   668 -- Page 669 -- 670