Minimum Equipment List (MEL):

While the Master Minimum Equipment List (MMEL) applies to a family of aircraft types, the MEL is specific to an operator’s aircraft and operating environment. The MEL considers factors such as route structure, geographic location, availability of spares, and maintenance facilities.

Key Differences Between MMEL and MEL:

• The MMEL is generic for a type of aircraft, while the MEL is tailored for specific operations.
• The MMEL cannot address operator-specific variables or interpret regulatory terms like “as required by regulations.”
• The MEL does not cover essential airworthiness items such as engines, landing gear, flaps, wings, and flight control surfaces.

Categories of MEL Deferral Timeframes:

• Category A: As per remarks.
• Category B: 3 days.
• Category C: 10 days.
• Category D: 120 days.

Purpose of the MEL:
The MEL is a joint operations and maintenance document created for or by the operator to:

1. Maintain Airworthiness: Identify the minimum equipment and conditions required to keep the Certificate of Airworthiness valid while meeting operational rules.
2. Operational Procedures: Define necessary procedures to maintain safety levels and handle inoperative equipment.
3. Maintenance Procedures: Outline maintenance actions and safety procedures to secure any inoperative equipment.