Plain English Meaning

An official FAA permission slip that tells an operator exactly how they're allowed to use a piece of equipment or carry out maintenance. For EFBs, it spells out which tablets and apps the operator can use instead of paper charts and manuals.

Full Definition

A formal authorization document issued by the FAA to an operator that defines the approved methods, limitations, and conditions under which specific maintenance activities and equipment may be used. In the EFB context, an MSpec authorizes an operator (typically Part 121 or 135) to use an Electronic Flight Bag in place of paper materials, specifying which devices, software, and procedures are approved.

Context Anchor

Seen in Electronic Flight Bag discussions when an operator must show that equipment, software, or related aircraft systems are maintained and controlled properly.