Definition
FAA Form 8010-4 is the Malfunction or Defect Report, the official FAA form used by mechanics, repair stations, owners, and operators to report a failure, malfunction, or defect found in an aircraft, engine, propeller, or appliance. Submitting the form feeds the data into the FAA's Service Difficulty Reporting (SDR) system, which the agency uses to track recurring problems across the fleet and decide whether further action — such as an Airworthiness Directive — is needed.
Plain English
It's the form a mechanic or operator fills out to tell the FAA that something on an aircraft broke, didn't work right, or was found defective. The FAA collects these reports to spot patterns and decide if any aircraft type needs a fix mandated across the fleet.
Context Anchor
Seen in aircraft maintenance, inspection, and safety reporting discussions when a serious or repeated problem needs to be reported to the FAA.
Derivation
FAA means Federal Aviation Administration. The number 8010-4 is simply the FAA’s assigned form number; it identifies this specific report form, not a technical aircraft part or procedure.
Why Pilots Care
Reports filed on Form 8010-4 are how the FAA learns that a part or system is causing trouble in the field. A defect you report today may become the basis for an Airworthiness Directive that protects every other operator flying the same equipment.
Example Sentence 1
After finding a cracked engine mount during the annual inspection, the mechanic submitted FAA Form 8010-4 to report the defect.
Example Sentence 2
All completed 8010-4 forms are submitted to the FAA so recurring problems can be identified across the fleet.