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Compression Tests
Does anyone do an "automotive" type compression test on their aircraft
engine? I think this kind of "dynamic" test might show problems (such as valves not opening all the way), that a leakdown test would not (and vice-versa). Anyway my annual is coming up and I want to do it. I imagine something that screws in and has a long hose to the guage, so no one has to stand behind the propellor. |
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Although I'll do either one the owner wants, I prefer the automotive style
tester. I can hear wheezes and such using this method that the other test just will not show. Whistle through the carb, you've got an intake valve leak. Singing out the exhaust, exhaust valve. Blowing out the crank vent and it is blowby the rings. Lots of good information. AND you don't have to get in the arc of the propeller and hold it steady against 80 pounds of pressure...you KNOW the propeller is going to spin. Jim P.S. It is not necessary to put the same question in all the rec.aviation.* newsgroups. Most of us read them all and it is just a waste of bandwidth. This one probably belongs in ra.owning. (Doug) shared these priceless pearls of wisdom: -Does anyone do an "automotive" type compression test on their aircraft -engine? I think this kind of "dynamic" test might show problems (such -as valves not opening all the way), that a leakdown test would not -(and vice-versa). Anyway my annual is coming up and I want to do it. I -imagine something that screws in and has a long hose to the guage, so -no one has to stand behind the propellor. Jim Weir (A&P/IA, CFI, & other good alphabet soup) VP Eng RST Pres. Cyberchapter EAA Tech. Counselor http://www.rst-engr.com |
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Does anyone do an "automotive" type compression test on their aircraft
engine? This used to be more common than the differential compression test. I have seen a set up for a 9 cylinder radial engine that had 9 adapters and gauges so that you can do all 9 cylinders at one time. I believe the gauges would hold the highest reading until reset. The old version of the AC 43.13 Acceptable Methods, Practices and Techniques, used to mention the direct compression test as acceptable. I believe that the current AC 43.13-1B no longer mentions it. Which begs the question is the direct compression test no longer acceptable? John Dupre' |
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You can conduct whatever you like - however your IA will require that a
leak down test be performed since it is prescribed under Part 43. Doug wrote: Does anyone do an "automotive" type compression test on their aircraft engine? I think this kind of "dynamic" test might show problems (such as valves not opening all the way), that a leakdown test would not (and vice-versa). Anyway my annual is coming up and I want to do it. I imagine something that screws in and has a long hose to the guage, so no one has to stand behind the propellor. |
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On Thu, 25 Mar 2004 22:20:47 -0800, Pat Barry wrote:
You can conduct whatever you like - however your IA will require that a leak down test be performed since it is prescribed under Part 43. prove it. TC |
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On Fri, 26 Mar 2004 18:35:32 -0500, "Gene Kearns"
wrote: Here is the train of thought..... Example, Lycoming engine (Continental is similar): FAR 43.13(a) Lycoming SSP-399 Page 1 Lycoming SI 1191 I like it, but... 43.13(a) is a catch-all reg, kinda like conduct unbecoming for a pilot. BTW, does it mention "inspection"? Lycoming may consider all it's publications mandatory/regulatory, but I'm afraid in reality, the FAA does not, unless you are operating Pt 135 (ref 135.421 if memory serves). TC |
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Pat Barry
shared these priceless pearls of wisdom: -You can conduct whatever you like - however your IA will require that a -leak down test be performed since it is prescribed under Part 43. That happens to be bull****. Jim Jim Weir (A&P/IA, CFI, & other good alphabet soup) VP Eng RST Pres. Cyberchapter EAA Tech. Counselor http://www.rst-engr.com |
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Uh, Gene, I will be less blunt than Jim and TC, and a bit more
informative... You are not reading carefully enough.. An IA is signing off a condition inspection, which is is not maintenance and therefore 43.13(a) does not apply. The regulatory language that specifically applies to the annual/100 hour condition inspection is 43.15(c)(2)i,ii,iii,iv and Appendix D. No where in those paragraphs will you see a leakdown test required. denny "Gene Kearns" wrote in message ... On Fri, 26 Mar 2004 18:08:26 -0500, wrote: |
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