MOPS Minimum Operational Performance Standards
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MORA Minimum Off-Route Altitude
MOS Metal Oxide Semiconductor
MOSFET Metal Oxide Semiconductor Field Effect Transmitter
MOU Memorandum Of Understanding
MP (1) Middle Plug. Identifies the plug position on the
rear connector of an avionics unit.
(2) Main Processor
MPEL Maximum Permissable Exposure Level
MROSE Multiple-tasking Real-time Operating System
Executive
MRR Manufacturing Revision Request
MS Millisecond
MSB Most Significant Bit
MSCP Mobile Satellite Service Provider
MSD (1) Most Significant Digit
(2) Mass Storage Device
MSG Message
MSI Medium Scale Integration
MSL Mean Sea Level
MSP Mode S Specific Protocol
MSSS Mode S Specific Services
MSU Mode Select Unit
MT Minimum Time
MTBF Mean Time Between Failures. A performance figure
calculated by dividing the total unit flying hours (air-
borne) accrued in a period of time by the number of
unit failures that occurred during the same time.
Where total unit hours are available,this may be used
in lieu of total unit flying hours.
MTBR (1) Mean Time Between Removal (2) Mean Time Between Repairs. A performance fig-ure calculated by dividing the total unit flying hours accrued in a period by the number of unit removals (scheduled plus unscheduled) that occurred during the same period.
MTBUR (1) Mean Time Between Unscheduled Removal (2) Mean Time Between Unit Replacements. A perfor-mance figure calculated by dividing the total unit fly-ing hours (airborne) accrued in a period by the num-ber of unscheduled unit removals that occurred dur-ing the same period.
MTC Maintenance Terminal Cabinet
MTD Maintenance Terminal Display
MTF Maintenance Terminal Function
MTI Moving Target Indicator. This type of radar display will show only moving targets.
MTM Module Test and Maintenance
MTMIU Module Test and Maintenance Bus Interface Unit
MTTDA Mean Time To Dispatch Alert
MTTF Mean Time To Failure. A performance figure calculat-ed by dividing the summation of times to failure for a sample of failed items by the number of failed items in the sample. The same item failing N times consti-tutes N failed items in the sample. This is different from mean time between failures since no allowance is given to items that have not failed.
MTTM Mean Time To Maintenance. The arithmetic mean of the time intervals between maintenance actions.
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