Glossary of Terms

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Mach number

‘Mach number’ means the ratio of true air speed to the speed of sound.

Magnetic variation

Magnetic variation. The angular difference between True North and Magnetic North.
Note.— The value given indicates whether the angular difference is East or West of True North.

Main rotor

‘Main rotor(s)’ means the rotor or rotors that supply the principal lift to a rotorcraft


MALSF - Medium-intensity Approach Lighting System with Sequenced Flashing lights


MALSR - Medium-intensity Approach Lighting System with Runway Alignment Indicator Lights

Manifold Pressure

‘Manifold Pressure’ piston engines means the absolute static pressure measured at the appropriate point in the induction system, usually in inches or millimetres of mercury.

Manoeuvring area

“manoeuvring area” means that part of an aerodrome used for the take-off, landing and
taxiing of aircraft, excluding aprons


Missed approach point (MAPt). That point in an instrument approach procedure at or before which the prescribed missed
approach procedure must be initiated in order to ensure that the minimum obstacle clearance is not infringed.

Author's Note : Turns are not normally made during a go-around before the MAPt


Marker. An object displayed above ground level in order to indicate an obstacle or delineate a boundary.

Marking. A symbol or group of symbols displayed on the surface of the movement area in order to convey aeronautical

Master Minimum Equipment list (MMEL)

“Master Minimum Equipment list (MMEL)” means a list established for a particular
aircraft type by the organisation responsible for the type design with the approval of
the State of Design containing items, one or more of which is permitted to be
unserviceable at the commencement of a flight and which may be associated with
special operating conditions limitations or procedures for that flight;

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