Hallo Florian,

von Lycoming gibt es eine SI Thema:

Evidence of metal contamination found in the filter element or screen requires further examination to determine the cause. Below is a list of recommended actions based on the appearance and approximate quantity of particles.

• 5 or fewer small (1/16 inch diameter or less) pieces of metal -- place aircraft back in service and check oil filter or screen at next scheduled oil change/oil filter replacement.

• 10 to 20 small (1/16 inch diameter or less) pieces of shiny flake-like, nonmagnetic, or 10 or fewer short hair-like pieces of magnetic material -- place engine back in service and again check oil filter or screen in 25 hours.

• 20 to 40 small pieces as in step b. -- place the aircraft back in service and check oil filter or screen at the next 10 hours.

• As in step b., but larger amount, such as 45-60 small pieces -- change filter or clean screen, drain oil, and refill. Run engine on ground for 20-30 minutes. Inspect filter/screen. If clean, fly aircraft for 1 to 2 hours and again inspect filter/screen. If clean, inspect filter/screen after 10 hours of flight time.
  

  NOTE: In items e. through j. below, the engine should be removed from service until the source of the metal is determined and corrective maintenance has been accomplished.

• Pieces of metal ranging in size of broken lead pencil point or greater. Remove suction (sump) screen to check for pieces of metal that may have fallen into the sump. In any event, ground aircraft and conduct investigation. A mixture of magnetic and nonmagnetic material in this case often times means valve or ring and piston failure. Removing bottom spark plugs usually reveals the offending cylinder.

• Nonmagnetic plating averaging approximately 1/16 inch in diameter; may have copperish tint. Quantity found -- 1/4 teaspoonful or more; ground aircraft and investigate.

• Same as in step b. but may be slightly larger in size and minus copperish tint. On direct drive engines, propeller action may be impaired. Ground aircraft and investigate.

• Nonmagnetic metal brass or copperish colored. Resembles coarse sand in consistency. Quantity of 1/4 teaspoonful or more -- ground aircraft and investigate.

• Anytime metal is found in the amount of 1/2 teaspoonful or more, it is justification for engine removal.
• If any single or several pieces of magnetic or nonmagnetic metal larger than previously mentioned are found, ground aircraft.

SI 1492C

Viele Grüße

Mark

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