Tyre Specification(s) and Installation
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AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators and maintenance organizations should verify all Type Certificate holder instructions, including the Maintenance Manual, Illustrated Parts Catalogue, and Aircraft Flight Manual, before selecting tyres. Only tyres explicitly approved by the Type Certificate holder should be installed. In cases of uncertainty regarding tyre specifications, stakeholders are advised to contact the Type Certificate holder for clarification. There is no mandatory compliance deadline as this bulletin provides recommendations only.
Summary
EASA Safety Information Bulletin SIB No. 2012-11 titled "Tyre Specification(s) and Installation" addresses issues related to tyre specifications and installation on aeroplanes with retractable landing gears, including the Diamond DA 42. The bulletin highlights a safety concern where a gear-up landing occurred due to a tyre outer diameter deviation caused by using a tyre brand different from that specified by the manufacturer. It applies to all aeroplanes certified or validated by EASA under CS-23, CS-VLA, CS-22, or CS-LSA, or certified by European National authorities before 28 September 2003 under equivalent standards.
What changed
This new bulletin introduces guidance emphasizing the importance of adhering strictly to the Type Certificate holder's instructions regarding tyre brand and size during maintenance. It clarifies that tyre size and European Technical Standard Order specifications alone do not guarantee interchangeability due to manufacturing tolerances affecting tyre diameter. The bulletin does not mandate Airworthiness Directive action but raises awareness of potential landing gear issues caused by incorrect tyre installation.
Why it matters
This information is critical for aviation professionals, including operators and maintenance organizations, to prevent landing gear malfunctions caused by improper tyre installation. Using tyres not approved by the Type Certificate holder can lead to safety risks such as gear-up landings. Ensuring compliance with manufacturer specifications helps maintain aircraft safety and operational reliability.
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