Service Instruction No. 1275 C

Cleaning Fuel Injector Nozzles

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Supersedes Service Instruction No. 1275B

September 23, 2008 

MODELS AFFECTED

Precision Airmotive  RS  and  RSA  Fuel  Injectors installed  on Lycoming  aircraft engines.

TIME OF COMPLIANCE

At overhaul and as engine conditions require. 

Fuel nozzles can become clogged with a type of varnish from old fuel or from precipitate particles that are  almost invisible to the naked eye. This condition may be indicated by rough engine operation, uneven idle, a  cold cylinder, or an unusually high fuel flow indication on the gauge. Complete the following steps, in the  order given, to remove, clean, and replace the fuel nozzles.

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