Thu, Jun 17, 2010
Fuel Pumps May Cause Engine Flooding, Fuel Leaks Due To
Overpressure
The FAA has issued a Special
Airworthiness Information Bulletin (SAIB) for certain part number
fuel pumps installed on, but not limited to, Rotax 912 series
aircraft engines. The pumps cause a possible unsafe condition on
special light sport category aircraft (SLSA), experimental light
sport aircraft (ELSA), and experimental amateur-built aircraft with
the engines installed.
In some cases, if the input pressure to the mechanical fuel pump
is high (e.g., due to an electric fuel pump upstream), the output
pressure from the mechanical fuel pump could be excessive. This
high fuel pressure may cause the engine to malfunction from
flooding and/or cause fuel leakage. The fuel pumps affected by this
issue are 892230, 892232, 892540 (standard version), and 892235,
892236, 892545 (version including flexible line). Pumps with part
numbers 892542 and 892546 are not affected.
The engines likely to be affected by this issue are:
- 912A S/Ns 4,410.684 through 4,410.727
- 912F S/Ns 4,412.913 through S/Ns 4,412.925
- 912S S/Ns 4,923.282 through 4,923.461
- 912UL S/Ns 4,407.646 through 4,408.361
- 912ULS S/Ns 5,646.084 through 5,648.164
- 912ULSFR S/Ns 4,430.267 through 4,430.500 and S/Ns 6,374.028
through 6,374.054
Rotax 912ULS
The FAA says ff your aircraft is affected by this issue,
replacement of the fuel pump part numbers listed above is
recommended following ROTAX Service Bulletins SB-912-053
and SB-912-053UL.
The FAA says it is taking airworthiness directive action to
address this issue on the type-certificated aircraft and
engines.
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