Data plate
Data plate means a fireproof plate that is inscribed with certain information required by 14 CFR part 45 (or for military surplus aircraft, as required by Military Specifications), and secured to an aircraft, aircraft engine, or propeller. The information must be marked by etching, stamping, engraving, or other approved method of fireproof marking. The plate must be attached in such a manner that it is not likely to be defaced or removed during normal service or lost or destroyed in an accident. Data plates are required only on certificated aircraft. However, non-certificated aircraft may also have data plates.