Don, The application of the rules have changed with regards to certified engines in experimentals. They used to be exempt from Airworthyness Directives, but now the FAA has chosen to enforce the ADs. A friend of mine had a mishap with his experimental last fall after 5" departed from one prop blade. While reviewing the aircraft logs, the FAA wanted his logs and informed him that they would be looking for compliance with all applicable ADs for the O-320-H2 engine on his plane. A certified engine on an experiemental is now required to comply with ADs. Not really a change in regulation by the FAA, but instead is a change in the interpretation of the regulations.
Having said that, the vast majority of ADs exist for safety reasons and are based on long term experience with failure of that engine or part. It is usually in your best interest to install the applicable ADs anyway. Here's where it gets into some of the nits that people will undoubtedly want to pick. If you are using a certified part, the ADs apply. For instance, many of the dual ignition revmaster engines use the Bendix single drive dual magneto. If that magneto is the same part number as the ones on a certified engine, or the serial number falls into the range of serial numbers for that type for which an AD has been issued, that AD also applies to that magneto on the Revmaster engine. OK, the question was posed earlier about building your own engine using a Continental crank and case, but Chevy pistons. In this example, any AD that applies to the crank and case would apply. Any AD that applies to the piston, would not. What if it's an O-290 GPU? Non of those parts are certified. ADs would apply to certified parts that would be installed, such as Magnetos, carb, oil cooler. The would not apply to the base engine and case as they are not certified parts. Even the oil pump AD would not apply. However, it would be in your best interest to comply anyway as there is a reason for the AD. I've seen the condition of some of the pump gears that have been removed. Bottom line here is that the ADs only apply to the certified parts. -Jeff Scott ------------------------------------------------------------- At 11:00 PM 5/11/2005, you wrote: >Speaking of certified engines, there is one gotcha I learned about that you >need to be aware of if you use one. > >When you use a certified engine in an experimental you are required to >comply with all the A.D.s. This is not correct. Your DAR was mistaken. When a certificated engine is installed in an experimental aircraft, ADs and service bulletins do not need to be complied with. There is one exception to this general rule and that is when a previously certificated engine is removed from an experimental and re-installed in a certificated airplane. In this case, all ADs must be in compliance. If your DAR raised (or raises) the issue, all you have to do is remove the data plate. Don Reid - donreid "at" peoplepc.com Bumpass, Va Visit my web sites at: AeroFoil, a 2-D Airfoil Design And Analysis Computer Program: http://aerofoilengineering.com KR2XL construction: http://aerofoilengineering.com/KR/KR2XL.htm Aviation Surplus: http://aerofoilengineering.com/PartsListing/Airparts.htm EAA Chapter 231: http://eaa231.org Ultralights: http://usua250.org VA EAA State Fly-in: http://vaeaa.org _______________________________________ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to [email protected] please see other KRnet info at http://www.krnet.org/info.html
