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Pilot/Controller Glossary 

6/17/21 

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.) 

PCG M