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between successive aircraft does not decrease
below the established minima.
MAHWP− Missed Approach Holding Waypoint
MAINTAIN−
a. Concerning altitude/flight level, the term
means to remain at the altitude/flight level specified.
The phrase “climb and” or “descend and” normally
precedes “maintain” and the altitude assignment;
e.g., “descend and maintain 5,000.”
b. Concerning other ATC instructions, the term is
used in its literal sense; e.g., maintain VFR.
MAINTENANCE PLANNING FRICTION LEVEL−
The friction level specified in AC 150/5320-12,
Measurement, Construction, and Maintenance of
Skid Resistant Airport Pavement Surfaces, which
represents the friction value below which the runway
pavement surface remains acceptable for any category
or class of aircraft operations but which is
beginning to show signs of deterioration. This value
will vary depending on the particular friction measurement
equipment used.
MAKE SHORT APPROACH− Used by ATC to
inform a pilot to alter his/her traffic pattern so as to
make a short final approach.
(See TRAFFIC PATTERN.)
MAN PORTABLE AIR DEFENSE SYSTEMS
(MANPADS)− MANPADS are lightweight, shoulder−
launched, missile systems used to bring down
aircraft and create mass casualties. The potential for
MANPADS use against airborne aircraft is real and
requires familiarity with the subject. Terrorists
choose MANPADS because the weapons are low
cost, highly mobile, require minimal set−up time, and
are easy to use and maintain. Although the weapons
have limited range, and their accuracy is affected by
poor visibility and adverse weather, they can be fired
from anywhere on land or from boats where there is
unrestricted visibility to the target.
MANDATORY ALTITUDE− An altitude depicted
on an instrument Approach Procedure Chart
requiring the aircraft to maintain altitude at the
depicted value.
MANPADS−
(See MAN PORTABLE AIR DEFENSE
SYSTEMS.)
MAP−
(See MISSED APPROACH POINT.)
MARKER BEACON− An electronic navigation
facility transmitting a 75 MHz vertical fan or boneshaped
radiation pattern. Marker beacons are identified
by their modulation frequency and keying code,
and when received by compatible airborne equipment,
indicate to the pilot, both aurally and visually,
that he/she is passing over the facility.
(See INNER MARKER.)
(See MIDDLE MARKER.)
(See OUTER MARKER.)
(Refer to AIM.)
MARSA−
(See MILITARY AUTHORITY ASSUMES
RESPONSIBILITY FOR SEPARATION OF
AIRCRAFT.)
MAWP− Missed Approach Waypoint
MAXIMUM AUTHORIZED ALTITUDE− A published
altitude representing the maximum usable
altitude or flight level for an airspace structure or
route segment. It is the highest altitude on a Federal
airway, jet route, area navigation low or high route,
or other direct route for which an MEA is designated
in 14 CFR Part 95 at which adequate reception of
navigation aid signals is assured.
MAYDAY− The international radiotelephony distress
signal. When repeated three times, it indicates
Pilot/Controller Glossary 2/17/05
PCG M−2
imminent and grave danger and that immediate
assistance is requested.
(See PAN-PAN.)
(Refer to AIM.)
MCA−
(See MINIMUM CROSSING ALTITUDE.)
MDA−
(See MINIMUM DESCENT ALTITUDE.)
MEA−
(See MINIMUM EN ROUTE IFR ALTITUDE.)
MEARTS−
(See MICRO-EN ROUTE AUTOMATED RADAR
TRACKING SYSTEM.)
METEOROLOGICAL IMPACT STATEMENT−
An unscheduled planning forecast describing conditions
expected to begin within 4 to 12 hours which
may impact the flow of air traffic in a specific center’s
(ARTCC) area.
METER FIX ARC− A semicircle, equidistant from
a meter fix, usually in low altitude relatively close to
the meter fix, used to help CTAS/HOST calculate a
meter time, and determine appropriate sector meter
list assignments for aircraft not on an established
arrival route or assigned a meter fix.
METER FIX TIME/SLOT TIME− A calculated time
to depart the meter fix in order to cross the vertex at
the ACLT. This time reflects descent speed adjustment
and any applicable time that must be absorbed
prior to crossing the meter fix.
METER LIST−
(See ARRIVAL SECTOR ADVISORY LIST.)
METER LIST DISPLAY INTERVAL− A dynamic
parameter which controls the number of minutes
prior to the flight plan calculated time of arrival at the
　
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