Ask Paul: Why is my engine oil creamy?

Q: I am doing a 100-hour inspection on a Piper Aztec with TSIO 540 Lycomings using Shell 15/50 oil with 50 hours on the oil. They are both midtime engines on this photo plane. They fly six hours a day at low power settings. The left engine oil is black like it should be after 50 hours. The right engine oil is a light creamy color. Something is not right.

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Ask Paul: What’s causing vibration?

Q: I recently installed a new three-blade propeller in my Comanche 250 with an O-540 engine. After the first flight I noticed a vibration when I decrease the rpm to 2400 or below, so I had the prop dynamically balanced. This did not change anything. The engine still vibrated.

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Ask Paul: Fly more, get longer TBO?

Q: I bought my first plane, a 1981 Cessna T182RG, in May 2012. I have been flying this plane frequently and have put over 300 hours on it in the last calendar year. I can tell you that in 2005 it received a factory remanufactured engine from Lycoming and at the 1,000 hour mark got a complete top end overhaul. Now Lycoming shows the TBO at 2,000 hours, but I have found documentation from Lycoming that put the TBO at 2,200 hours providing you are running at 40 hours a month. For me that translates to the more you run the engine the more hours you can squeeze out of it.

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FAA issues Emergency AD for some Rotax 912 engines

The FAA has issued an emergency airworthiness directive affecting certain Rotax 912 series engines. According to a report at EAA.org, the AD requires that the pressure side fuel hose be replaced on fuel pumps with the certain serial numbers. An AD from the European Aviation Safety Agency indicates that the pressure side fuel hose on these pumps may not be manufactured to full fuel-resistant standards, which could result in the degradation of the interior of the hose and the resulting debris fouling the fuel system.