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FDSO Reports on Improper Propeller Installation A FAA Flight Standards District Office (FSDO) in Alabama identified and reported finding 12
aircraft, using Textron Lycoming engines, which had the constant speed propeller installed
incorrectly.
Improper installation of the propeller can result from an incorrect interpretation of the diagram views
presented in Textron Lycoming Service Instruction (SI) 1098F. As a consequence, the bushings may be installed in the wrong location on the crankshaft flange. The incorrect installation of the bushings on the crankshaft flange could contribute to the following:
1. Hand propping accidents due to improper blade position during impulse coupling
engagement.
2. Excessive propeller blade stresses
To clarify the views of the two (2) diagrams shown in SI 1098F, Textron Lycoming has issued a
revision to SI 1098G, dated April 30, 2001, which added the following “Note” to the crankshaft flange bushing installation diagrams:
“NOTE: These are viewed from the front of the engine looking aft.”
Contact an Aviation Attorney in Alabama to find out more about your legal rights.
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