Pilot/Controller Glossary

ridge of a sharp bluff area. As the air hits the upwind
side of the range, it starts to climb, thus creating what
is generally a smooth updraft which turns into a
turbulent downdraft as the air passes the crest of the
ridge. Mountain waves can cause significant
fluctuations in airspeed and altitude with or without
associated turbulence.
(Refer to AIM.)

MOVEMENT AREA- The runways, taxiways, and
other areas of an airport/heliport which are utilized
for taxiing/hover taxiing, air taxiing, takeoff, and
landing of aircraft, exclusive of loading ramps and
parking areas. At those airports/heliports with a
tower, specific approval for entry onto the movement
area must be obtained from ATC.
(See ICAO term MOVEMENT AREA.)

MOVEMENT AREA [ICAO]- That part of an
aerodrome to be used for the takeoff, landing and
taxiing of aircraft, consisting of the maneuvering area
and the apron(s).
MOVING TARGET INDICATOR- An electronic
device which will permit radar scope presentation
only from targets which are in motion. A partial
remedy for ground clutter.

MRA-
(See MINIMUM RECEPTION ALTITUDE.)

MSA-
(See MINIMUM SAFE ALTITUDE.)

MSAW-
(See MINIMUM SAFE ALTITUDE WARNING.)

MTI-
(See MOVING TARGET INDICATOR.)

MTR-
(See MILITARY TRAINING ROUTES.)

MULTICOM- A mobile service not open to public
correspondence used to provide communications
essential to conduct the activities being performed by
or directed from private aircraft.
MULTIPLE RUNWAYS- The utilization of a
dedicated arrival runway(s) for departures and a
dedicated departure runway(s) for arrivals when
feasible to reduce delays and enhance capacity.
MVA-
(See MINIMUM VECTORING ALTITUDE.)