Narrative:

I serviced propeller gearbox oil after aircraft landed. Aircraft flew the next flight leg where the copilot on the postflight observed oil leaking out of the right-hand propeller gearbox oil filler spout. Cleaned oil off of side of the engine cowling; replenished oil to serviceable level. The oil filler cap may not have been fully locked down after servicing and came loose -- off inflight -- leading to oil being spilled overboard from the filler spout. Recommendations: coloring the locking latch (such as on the cowl latches) to make them easier to identify when they are not latched by the mechanic and flight crew during pre- and postflights.

Google
 

Original NASA ASRS Text

Title: Mechanic reports that a First Officer noticed oil leaking out of the right engine Propeller Gearbox (PGB) oil filler spout; of a Saab-340B; during his postflight walk around. Mechanic believes he may not have fully locked down the oil filler cap.

Narrative: I serviced propeller gearbox oil after aircraft landed. Aircraft flew the next flight leg where the Copilot on the postflight observed oil leaking out of the right-hand propeller gearbox oil filler spout. Cleaned oil off of side of the engine cowling; replenished oil to serviceable level. The oil filler cap may not have been fully locked down after servicing and came loose -- off inflight -- leading to oil being spilled overboard from the filler spout. Recommendations: Coloring the locking latch (such as on the cowl latches) to make them easier to identify when they are not latched by the mechanic and flight crew during pre- and postflights.

Data retrieved from NASA's ASRS site as of April 2012 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.