MTTMA Mean Time To Maintenance Alert
MTTR Mean Time To Repair. A performance figure calculated by dividing the sum of the active repair elapsed times accrued in a period on a number of designated items by the number of these items repaired in the same period.
MTTUR Mean Time To Unscheduled Removal. A performance figure calculated by dividing the summation of times to unscheduled removal for a sample of removed items by the number of removed items in the sample. This is different from MTBUR since no allowance is given to items that have not been removed.
MU ACARS Management Unit
MULT Multiplier
MUS Minimum Use Specification. A generic description by parameter and characteristics of the test equipment and resources required for testing a unit or system.
MUX Multiplexer
N
N1 Fan speed
N2 Intermediate compressor speed
N3 High speed compressor
NACA National Air Carriers Association
NADIN National Airspace Data Interchange Network
NAS National Airspace System
NASA National Aeronautics and Space Administration
NASPALS NAS Precision Approach and Landing System
NAS/TRB National Academy of Science,Transportation Research Board
NAT North Atlantic Region
NAT SPG North Atlantic Systems Planning Group
NATCA National Association of Air Traffic Controllers
NATRSSIG ICAO North Atlantic ReducedSeparation Standard Implementation Group
NATS (1) North Atlantic Track System (2) UK National Air Traffic Services
NAV Navigation
NAVAID Navigational Aid
Navigation A medium holding the customized navigation
Datacard database.
NAVSTAR The NAVSTAR global positioning system (GPS) is a
system using 24 satellites,all reporting precise time
signals,along with location keys. Eight satellites are
in each of three 63-degree inclined plane circular
orbits at 11,000 nmi in altitude. The system is used
for navigation and determining exact position.
Nautical Mile Equivalent to 6,076.1 feet, or approximately 1.15
(nmi) statute miles.
NBAA National Business Aircraft Association
NC Numerical Control
N/C New installation Concept
NCA National Command Authority
NCD No Computed Data
NCR National Cash Register
NCS Network Coordination Station
ND Navigation Display. An EFIS presentation substituting
for the horizontal situation indicator (HSI).
NDB (1) Non-Directional Radio Beacon. A ground station
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