Minimum Equipment list (MEL)

The Minimum Equipment List (MEL) is a document and method aircraft operators use to obtain relief from Federal Aviation Regulations requiring that all equipment installed on the aircraft be operative at the time of flight.

MMEL     - design/manufacture
MEL         - operator

     Category A - this should be recorded within the time interval specified in                              the remark column of the MEL
Category B - 3 Days
Category C - 10 day          
Category D - 120 days

Not include items
Wings, landing gear, both engines, flight control system.

Included items
ETOPS, RVSM

TCAS, GPWS, CVR, DFDR, Emergency Escape Path Mark lighting.

ETOPS - Extended-range Twin-engine Operational Performance Standards
RVSM - Reduced vertical separation minimum
TCAS  - traffic collision avoidance system
CVR    - cockpit voice recorder
DFDR – digital flight data recorder   







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