AAIB investigation to Grob G 120TP-A, G-ETPC
Propeller oil leak in-flight, RNAS Yeovilton, Somerset, 15 September 2021.
Summary:
During a training flight, forward visibility was obscured when engine oil leaked from the propeller onto the windscreen. The pilot made a successful precautionary landing using full sideslip to enable him to use the only part of the windscreen that was clear.
An examination of the propeller revealed a damaged piston seal. The aircraft manufacturer had previously issued a Service Letter regarding oil leaking from the piston seal and following this event the propeller manufacturer issued a Service Bulletin to inform operators of an improved O-ring seal with increased durability.
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Published 9 June 2022