3.11 Repair Interval Categories

The maximum time an aircraft may be operated between the deferral of an inoperative item and its repair will be specified in the MEL or GMEL. Passenger convenience items referred to in paragraphs 3.9.4 a) and 3.9.4 b) must include a category. Most of these items will be a "D" category provided any (M) procedure (in the case of electrically supplied items) is applied.

Since the MEL is a dispatch document, the repair interval may expire in flight without penalty.

Category A

Items in this category shall be repaired within the time interval specified in the "Remarks and Exceptions" column of the air operator's approved MEL Whenever the proviso in the "Remarks or Exceptions" column of the MMEL states cycles or flight time, the time interval begins with the next flight. Whenever the time interval is listed as flight days, the time interval begins on the flight day following the day of discovery.

Time Limited Dispatch - Some MEL's have relief that is subject to time limited dispatch expressed as a specific number of engine hours or cycles, and will start in accordance with the times established by the engine manufacturer or as indicated in the remarks column of the MEL. Time limited relief cannot be extended.

Category B

Items in this category shall be repaired within three consecutive calendar days, excluding the day of discovery.

Category C

Items in this category shall be repaired within 10 consecutive calendar days, excluding the day of discovery

Category D

Items in this category shall be repaired within 120 consecutive calendar days, excluding the day of discovery.

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