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landing site and duration of flight are at the discretion of the
pilot. Extended flight beyond the nearest approved landing
area is not recommended.
Land immediately. ATC instruction to pilot. The urgency
of the landing is paramount. The primary consideration is
to ensure the survival of the occupants. Landing in trees,
water, or other unsafe areas should be considered only as
a last resort.
LDA. See localizer-type directional aid.
Lead radial. The radial at which the turn from the DME arc
to the inbound course is started.
Leans, the. A physical sensation caused by an abrupt
correction of a banked attitude entered too slowly to
stimulate the motion sensing system in the inner ear. The
abrupt correction can create the illusion of banking in the
opposite direction.
Lift. A component of the total aerodynamic force on an airfoil
and acts perpendicular to the relative wind.
Lines of flux. Invisible lines of magnetic force passing
between the poles of a magnet.
L/MF. See low or medium frequency.
LMM. See locator middle marker.
Load factor. The ratio of a specified load to the total weight
of the aircraft. The specified load is expressed in terms of
any of the following: aerodynamic forces, inertial forces, or
ground or water reactions.
Loadmeter. A type of ammeter installed between the generator
output and the main bus in an aircraft electrical system.
LOC. See localizer.
Local area augmentation system (LAAS). A differential
global positioning system (DGPS) that improves the accuracy
of the system by determining position error from the GPS
satellites, then transmitting the error, or corrective factors,
to the airborne GPS receiver.
G-11
Localizer (LOC). The portion of an ILS that gives left/right
guidance information down the centerline of the instrument
runway for final approach.
Localizer-type directional aid (LDA). A NAVAID used
for nonprecision instrument approaches with utility and
accuracy comparable to a localizer but which is not a part
of a complete ILS and is not aligned with the runway. Some
LDAs are equipped with a glide slope.
Locator middle marker (LMM). Nondirectional radio
beacon (NDB) compass locator, collocated with a middle
marker (MM).
Locator outer marker (LOM). NDB compass locator,
collocated with an outer marker (OM).
LOM. See locator outer marker.
Long range navigation (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
transmitters. LORAN A operates in the 1750 to 1950 kHz
frequency band. LORAN C and D operate in the 100 to 110
kHz frequency band.
LORAN. See long range navigation.
Low or medium frequency. A frequency range between
190–535 kHz with the medium frequency above 300
kHz. Generally associated with nondirectional beacons
transmitting a continuous carrier with either a 400 or 1,020
Hz modulation.
Lubber line. The reference line used in a magnetic compass
or heading indicator.
MAA. See maximum authorized altitude.
Mach number. The ratio of the true airspeed of the aircraft
to the speed of sound in the same atmospheric conditions,
named in honor of Ernst Mach, late 19th century physicist.
Mach meter. The instrument that displays the ratio of the
speed of sound to the true airspeed an aircraft is flying.
Magnetic bearing (MB). The direction to or from a radio
transmitting station measured relative to magnetic north.
Magnetic heading (MH). The direction an aircraft is pointed
with respect to magnetic north.
Mandatory altitude. An altitude depicted on an instrument
approach chart with the altitude value both underscored and
overscored. Aircraft are required to maintain altitude at the
depicted value.
Mandatory block altitude. An altitude depicted on an
instrument approach chart with two underscored and
overscored altitude values between which aircraft are
required to maintain altitude.
MAP. See missed approach point.
Margin identification. The top and bottom areas on an
instrument approach chart that depict information about
the procedure, including airport location and procedure
identification.
Marker beacon. A low-powered transmitter that directs its
signal upward in a small, fan-shaped pattern. Used along the
flight path when approaching an airport for landing, marker
beacons indicate both aurally and visually when the aircraft
is directly over the facility.
Maximum altitude. An altitude depicted on an instrument
approach chart with overscored altitude value at which or
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Instrument Flying Handbook仪表飞行手册下(108)
