Definition
An FAA report (FAA Form 8010-4) submitted by certificated maintenance personnel, repair stations, air carriers, and operators to document a serious mechanical failure, malfunction, or defect found in an aircraft, engine, propeller, or appliance. The report provides the FAA with data used to identify recurring problems, support airworthiness directives, and improve aviation safety.
Plain English
A form sent to the FAA when a mechanic or operator finds something seriously wrong with an aircraft or its parts, so the FAA can track problems and warn others.
Context Anchor
Seen in aircraft maintenance records, repair station procedures, and FAA maintenance reporting requirements.
Derivation
Malfunction combines “mal,” meaning “badly,” with “function,” meaning “to work.” Defect comes from a word meaning “to fail” or “to be lacking.” Together, the phrase points to equipment that either does not work correctly or has a flaw that may affect safe use.
Why Pilots Care
Proper submission supports fleet-wide safety tracking and fulfills regulatory requirements that protect continued airworthiness.
Intuition Check
Do not read this as just any casual write-up of a problem. In this context, it means a formal FAA report for a problem that meets specific reporting rules.
Example Sentence 1
After finding a cracked engine mount during inspection, the mechanic filed a Malfunction or Defect Report with the FAA.
Example Sentence 2
Recurring Malfunction or Defect Reports on a particular component prompted the manufacturer to issue a service bulletin.