Definition
In the context of a Minimum Equipment List (MEL), maintenance procedures are the specific steps required to deactivate, secure, or otherwise prepare an inoperative item before the aircraft can be dispatched under the MEL. These procedures are referenced in the MEL and must be accomplished by qualified maintenance personnel and properly documented in the aircraft records.
Plain English
These are the maintenance steps that must be done to a broken item — like pulling a circuit breaker, capping a line, or placarding a switch — before the aircraft is legal to fly with that item not working.
Context Anchor
Seen when using a Minimum Equipment List to decide whether an airplane can be flown with a piece of equipment not working.
Derivation
Maintenance comes from an older word meaning “to keep in condition.” Procedure comes from a word meaning “a way of going forward.” Together, the phrase points to the set steps used to keep the aircraft in an acceptable condition for flight.
Why Pilots Care
Proper maintenance procedures keep the aircraft airworthy, satisfy regulatory requirements such as those in the MEL, and reduce the chance of mechanical issues during flight.
Intuition Check
Do not read maintenance procedures as general repair work. In this context, it means the specific required steps tied to an item that is not working before the airplane may be flown.
Example Sentence 1
Before dispatching with the inoperative landing light, the technician completed the maintenance procedures called out in the MEL and made the appropriate logbook entry.
Example Sentence 2
The pilot confirmed that all required maintenance procedures had been signed off before accepting the aircraft for the day's flight.