Definition
A formal written statement issued by a manufacturer affirming that a product, part, appliance, or article meets all applicable airworthiness requirements, standards, and specifications established by the regulatory authority. The declaration is signed by an authorized representative of the manufacturer and serves as documented evidence that the item conforms to its approved design and is suitable for use in certificated aircraft.
Plain English
A signed statement from the maker that says, 'This part meets all the rules it has to meet.' It's the manufacturer's official word that the item is built to the approved standard and is safe to use on an aircraft.
Context Anchor
Seen in aircraft certification records, especially when dealing with special light-sport aircraft and their airworthiness paperwork.
Derivation
From the Latin 'declarare' (to make clear) and 'complere' (to fill up or fulfill). A 'declaration of compliance' literally means 'a clear statement that the requirements have been fulfilled.'
Why Pilots Care
Allows legal operation of modified or newly built aircraft once the declaration is accepted, avoiding delays from extra inspections.
Intuition Check
Do not read this as a casual claim that the aircraft is “probably okay.” In this context, it means a formal manufacturer certification tied to specific required standards.
Example Sentence 1
When the new fuel pump arrived, the mechanic checked the box for the Declaration of Compliance before installing it on the aircraft.
Example Sentence 2
After review, the FAA accepted the Declaration of Compliance and the aircraft returned to service.