tag:blogger.com,1999:blog-510895126408960571.post6578841316873787917..comments2023-11-10T05:21:02.149-05:00Comments on N631S: 2011 Annual Inspection (i)Unknownnoreply@blogger.comBlogger5125tag:blogger.com,1999:blog-510895126408960571.post-87076424922017797092011-04-12T21:41:57.110-04:002011-04-12T21:41:57.110-04:00Thanks, Frank, for that great explanation. I unde...Thanks, Frank, for that great explanation. I understand a lot more about the thought process now. For years I pulled SOAP samples from engines and never saw any evidence of any thinking being driven by the evidence produced. <br /><br />Have another great year in the sky.Dave Starrhttp://philfaqs.comnoreply@blogger.comtag:blogger.com,1999:blog-510895126408960571.post-1915743692368335692011-04-07T20:34:29.936-04:002011-04-07T20:34:29.936-04:00Hi, Dave!
Yep, I am theological about oil analysi...Hi, Dave!<br /><br />Yep, I am theological about oil analysis. A sample from every oil change goes to the same lab and I monitor results to watch for any adverse trend. So far, no issues.<br /><br />Also, every filter gets cut and the media examined for evidence of metal. So far, no metal!<br /><br />So what do we have here? An engine with consistently low micron-level residues of all metallics in the used oil. An engine that does not deposit macro particles of metal in the filter media. An engine which does not burn oil between oil changes. And (stay tuned!) an engine which I anticipate will be OK on all cylinders for the borescope visual.<br /><br />But, with a cylinder or two on the low side for the compression test. To me that all adds up to good news. I'm a strong believer in "condition-based maintenance" and I feel that I have good evidence of condition that allows continued unrestricted operation of the engine.<br /><br />If I see a spike in oil consumption or any anomaly in the SOAP data on an oil change (or metal in a filter!) I will pull the cowling and have the compressions rechecked and another borescope inspection done. And react as required by the results. I certainly see NO probability of a catastrophic failure. So I'm comfortable with the program. I plan to fly the machine.<br /><br />Finally, I don't believe there's a conflict between "engineering/do it right" and "practical/be safe but don't spend more time fixing than flying". If you believe in "maintain on condition", the two approaches collapse into one.<br /><br />Best regards,<br /><br />FrankFrank Van Hastehttps://www.blogger.com/profile/10821687850881538546noreply@blogger.comtag:blogger.com,1999:blog-510895126408960571.post-42532162320791306892011-04-07T19:12:26.998-04:002011-04-07T19:12:26.998-04:00Frank, You mentioned using a SOIAP program a while...Frank, You mentioned using a SOIAP program a while back ... when you wrote an article on changing oil I believe. Are you still using the program and has it revealed anyhting interesting? <br /><br />I'd like to hear your comments, as you maintain a good balance between the engineering/it must be done right sort of guy and the practical, do what it needs to be safe, but not so safe we spend more time fixing than flying.<br /><br />In my relatively untutored view, the SOAP results would have a lot to do with my decision on what to do withh your #2. <br /><br />The compression results and history make me fell it's likely good to go for another year, but if there has been any recent change in the 'metal making' world I might well decide differently.Dave Starrhttp://philfaqs.comnoreply@blogger.comtag:blogger.com,1999:blog-510895126408960571.post-41125314950084521452011-04-07T08:54:37.079-04:002011-04-07T08:54:37.079-04:00Thanks, Toria. I'm not expecting anything majo...Thanks, Toria. I'm not expecting anything major to emerge. Of course, you never know 'til it's over.Frank Van Hastehttps://www.blogger.com/profile/10821687850881538546noreply@blogger.comtag:blogger.com,1999:blog-510895126408960571.post-44898892036255608792011-04-06T21:48:24.286-04:002011-04-06T21:48:24.286-04:00Good luck on the rest of the inspection!Good luck on the rest of the inspection!Victoriahttps://www.blogger.com/profile/11364000198476009372noreply@blogger.com