Which MEL category corresponds to a 10-day time limit?

• A. Category C
• B. Category A
• C. Category B
• D. Category D

Answer: (A)

The main concept here is how the MEL categories set the allowable deferral time for an inoperative item. The category tells you how long you can operate with that item missing before it must be repaired, under the MEL's specified conditions.

A 10-day limit corresponds to Category C. That means an item listed under Category C can be deferred for up to ten days from the discovery (or from the start of the current dispatch window, per the MEL’s wording), provided you follow any associated operating restrictions and documentation. After that 10-day window, the item must be repaired to continue operating under the MEL.

In general, Category A and Category B items are more time-constrained than Category C, while Category D is the most permissive. The exact wording and limits are specified in the MEL/MMEL and the operator’s approved procedures, so always refer to those documents for the precise conditions.