Definition
The highest total weight at which an airplane is approved by the manufacturer and certifying authority (such as the FAA) to begin a takeoff roll. This limit is established during aircraft certification testing and is published in the airplane's Type Certificate Data Sheet and Pilot's Operating Handbook. Operating above this weight is prohibited and may compromise structural integrity, performance margins, and controllability.
Plain English
The heaviest the airplane is legally allowed to be when it starts its takeoff roll. Anything heavier than this number is not permitted.
Context Anchor
Seen during weight-and-balance planning and when checking performance information before a flight.
Derivation
Certificated' comes from the Latin certus, meaning 'sure' or 'fixed.' A certificated weight is one that has been formally tested, approved, and locked in by an official authority — not just suggested by the manufacturer. This matters because the limit carries legal weight (literally), not just engineering advice.
Why Pilots Care
Exceeding this weight reduces takeoff performance, climb capability, and structural margins, creating an unsafe flight condition.
Intuition Check
Do not read “maximum” as “the most the airplane can possibly get off the ground with.” Here it means the highest takeoff weight the airplane is officially approved to use.
Example Sentence 1
After loading passengers and baggage, the pilot calculated the total weight and confirmed it was 50 pounds below the maximum certificated takeoff weight.
Example Sentence 2
High density altitude forced the pilot to reduce fuel load to stay within the maximum certificated takeoff weight.