EASA Safety Information Notice
2007 - 01
Issued: 05 January 2007
Use of Automotive Gasoline (Mogas) containing Bio-Ethanol
Foreign AD :
See FAA Special Airworthiness Information Bulletin CE-07-06
Several aircraft equipped with piston engines are approved for
operation with automotive gasoline (mogas). These approvals
may be limited to the use of mogas that does not contain low-
molecular weight alcohols (methanol or ethanol). However, not
all (Supplemental) Type Certificated products have this
The current European fuel standard EN 228 allows up to 3 vol-
% methanol and 5 vol-% ethanol without further declaration.
While in the past most of the fuel did not contain methanol or
ethanol, this situation has changed due to implementation of
the “Directive 2003/30/EC of the European Parliament and of
the Council of 8 May 2003 on the promotion of the use of bio
fuels or other renewable fuels for transport” in the EU member
states. It is anticipated that the amount of ethanol added to the
fuel will increase even further in the future.
The usage of fuel containing methanol or ethanol in aircraft
which are not designed and approved for it can cause the
Increased risk for vapour lock due to different volatility.
Incompatibility with several materials in the fuel system.
- Phase separation into an alcohol-rich aqueous phase and
an alcohol-poor hydrocarbon phase when the fuel is cooled
(e.g. in high altitude) and not free of water.
These problems can cause engine in-flight shut downs or fires
due to leakages.
All aircraft equipped with spark ignited piston engines and
approved for operation with automotive gasoline (mogas).
Recommendation: Check whether your aircraft is approved for operation with
mogas containing low-molecular weight alcohols (methanol or
If not, do not use mogas without having evidence that it is free
of methanol or ethanol