EASA SIB 2011-01R2
WITHDRAWN: TECHNICAL CONTENT COVERED IN CS-STAN, SUBPART B, CS-SC202
Summary
WITHDRAWN: TECHNICAL CONTENT COVERED IN CS-STAN, SUBPART B, CS-SC202 is an EASA Safety Information Bulletin (SIB No. 2011-01R2) issued on 2012-05-10. It provides information about the use of unleaded Aviation Gasoline UL 91 in aeroplanes powered by spark-ignited piston engines, referencing specific engine service instructions such as Rotax SI-912-016/SI-914-019 and Lycoming Service Instruction No. 1070R. The bulletin clarifies fuel standards and approvals related to unleaded Avgas UL 91 and its compatibility with engines approved for Avgas or Motor Gasoline (Mogas).
What Changed
This revision (2) of the SIB allows the use of unleaded Avgas UL 91 in engines and aeroplanes approved for use with Mogas RON 95 (MON 85). It updates references to fuel standards and engine service documents to their latest revisions and clarifies differences in fuel properties between unleaded Avgas UL 91 and other gasoline types. The bulletin also emphasizes that use of UL 91 in non-approved engines may cause damage or failure.
Why It Matters
This information is important for aviation professionals to ensure safe fuel use and compliance with engine approvals, preventing potential engine damage or in-flight failures. Operators and maintenance organizations must understand the compatibility of unleaded Avgas UL 91 with their specific engines and aeroplanes to maintain airworthiness and operational safety. It also supports the transition to unleaded fuels, which have environmental and health benefits compared to traditional leaded Avgas.
What To Do
Operators should verify engine approval status for unleaded Avgas UL 91 by consulting the latest engine type certificate holder instructions. They must ensure engines have not been modified and comply with original certification specifications. Additionally, fuel caps should be labeled to indicate that unleaded Avgas UL 91 is an acceptable fuel. No mandatory compliance deadline is specified as this bulletin provides non-mandatory recommendations.