---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Tue 10/29/13: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 11:14 AM - Re: Help! (James Goolsby) 2. 01:02 PM - Re: Air Compressor (?) Issue (James Goolsby) 3. 01:25 PM - Re: Air Compressor (?) Issue (Roger Kemp M.D.) ________________________________ Message 1 _____________________________________ Time: 11:14:29 AM PST US Subject: Re: Yak-List: Help! From: James Goolsby Love to but still flying the 24. Pappy Sent from my iPad from some where on The 3rd rock from the Sun. > On Oct 28, 2013, at 17:04, Jay Land wrote: > > I cannot but have passed along to Alex > > > On 10/28/13 12:29 PM, "jblake207@comcast.net" wrot e: > > Need a little help from my Red Star friends... I originally committed to d o a fly over of the USS Yorktown in Charleston, SC on 9 November as part the ir Veteran=99s Day salute. That was before my son=99s football t eam won the regional championship. Now, they have their first playoff game t hat weekend, so I need to be there instead of flying. Here=99s the =9CHelp!=9D part I committed to share a rental house with a few other Red Star pilots, so if you=99d like to do some flying (or n ot), hang out with a few Red Star pilots in Charleston (or not), I=99l l give you a great deal on my share of the house. In fact, I=99ll thr ow in a GPS to sweeten the deal of course, it=99s a first Gen , handheld Trimble used in Desert Storm, but still works! Please message me if you=99re interested. > > Jon Blake > jblake207@comcast.net > > > > ========== > Email Forum - > List">http://www.matronics.com/Navigator?Yak-List > ========== > sp; - MATRONICS WEB FORUMS - > ums.matronics.com > ========== > sp;- List Contribution Web Site - > sp; -Matt Dralle, List Admin. > http://www.matronics.com/contribution > ========== > > > > 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > ________________________________ Message 2 _____________________________________ Time: 01:02:39 PM PST US Subject: Re: Yak-List: Air Compressor (?) Issue From: James Goolsby Doc, I'm here at KMGM until 1630 (I've got be copilot on the 17 this evening). W e'll be leaving tomorrow about noon. Pappy. Sent from my iPad from some where on The 3rd rock from the Sun. > On Oct 15, 2013, at 20:46, "Roger Kemp M.D." wro te: > > One thought, since there was a fire that involved the firewall were the ch eck valves at the pop off valve rebuilt or replaced. Is it possible that the lower check valve between the snot bottle and the pop off valve and the fil ter are reversed. Instead of the one way valve arrow on the check valve poin ting to the filter and theophylline off valve could it be pointing at the sn ot bottle. Did y'all re-assemble the H or was it done in the field? Is the f ilter patent or is it clogged up from carbon deposited? > I saw your #2 in the summary list that referred to testing the H setup. Wa s it disassemble after ya'll shipped it. As you know the check valve directi on will have a big impact on air flow. > Just a though. > Doc > > Sent from my iPad > >> On Oct 15, 2013, at 4:09 PM, "Jill Gernetzke" wrote: >> >> Group, >> >> We have met up with a head scratcher. I am throwing it out to the group t o chew on: >> >> The Yak 52 owner purchased his aircraft on an insurance sale. The aircra ft had been totaled because of an engine fire. Attempts to talk to the orig inal owners and learn more about the aircraft=99s history have been un successful. Originally, we were contacted because the air system was not bu ilding pressure. A photo sent by the owner, elicited a remark by me that th ere seemed to be a lot of oil in the banjo/outlet valve fitting. The compre ssor itself was very dirty. >> The owner cleaned the outlet valve with no appreciable change in output. >> He then bought a "NOS" comp from a private party, installed it and it fa iled in 2.5 hours. This compressor had actually been overhauled by us in 20 06. The nuts stripped off of the 4 studs on the bottom end of the compresso r (green case), allowing the top end off the compressor to hammer up and dow n. Oil was all over the back end of the engine. >> >> The customer then sent his original compressor for overhaul and run on ou r test bench. He installed this overhauled compressor and it failed after 4 0 minutes in flight. This time the 4 studs sheared off of the bottom end of t he compressor. >> >> He sent us both failed compressors, the drive and drive gear, shear coupl ing, the FT-1 =9Csnot=9D valve and the pressure relief tee setu p. We built one compressor out of the two failed units. The 4 stripped stu ds were replaced with new studs and installed with Loctite. The compressor w as test run and produced 925 psi. The pressure relief valve tee setup was t ested =93 it relieved normally - rebuilt with a new piston, new seals in the one way checkvalves and the pressure set to 50 atm. (The pressure re lief valve had a Teflon seal which was in very poor condition.) The snot val ve was tested, flushed and retested. The compressor, gaskets and drive unit were secured to one another in the proper alignment for the reinstall. >> >> The air compressor was returned to the customer and it was reinstalled wi thout attaching the steel air line. Everything was normal for about 1.5 hour s of ground runs. >> >> A flight was completed with the steel coiled air line still not attached. The flight was normal. >> >> The steel line was reattached and 90 minutes of ground run time. He noti ced that pressure was not building as it should and opened the cowling to f ind one of the 4 hold-down nuts backing off. He also reported that the other 3 nuts were not tight. The owner drilled and safety wired the nuts. >> >> (Note: There is a CRITICAL clearance that is set between the bottom of t he Stage I piston and the top of the Stage II cylinder. Over-tightening the se nuts will cause the top of the piston to hit the top of the Stage II cyli nder. Too much clearance and it bottoms out on the other end.) >> >> We received the compressor and installed new studs and steel locknuts wit h Loctite. The compressor has been returned but not run, yet. >> >> Here is what we know: >> 1. The FT-1 Snot valve is was flushed and functioning properly. >> 2. The pressure relief valve tee and checkvalves were all tested an d the system functioned normally on a bench test, with the pressure relief v alve popping off at 750 psi. >> 3. A new steel line was provided to the customer, but I do not know if this was installed. >> 4. On the 4th installation of the compressor, we returned the compr essor, shear coupling, drive pad and gear tie-wrapped as a unit for correct c locking. We received photo verification that the compressor drive was insta lled correctly. >> 5. The compressor operated normally on the last run until the steel line was attached to it. Then, 1 nut backed off and the other 3 were repor ted loose. Hence, we replaced the hex nuts/lockwashers with steel locknuts i n case the lockwashers had failed and that was the only problem on the last r un. >> 6. The force to shear the compressor studs is in excess of 22,000 l bs. >> 7. The shear coupling appears to be a factory unit. A new one was s ent to the customer, but returned back to me. >> 8. The oil return holes in the accessory case are large and not plu gged. >> >> In the 20+ years that we have been overhauling air compressors, we have n ever encountered this problem. Please use this problem as your own theoreti cal and reasoning challenge to put forth real possibilities =93graspin g at unicorns, rainbows or butterflies not allowed. : ) >> >> Jill >> M-14P, Inc. >> >> >> >> >> >> ========================= ========= >> //www.matronics.com/Navigator?Yak-List >> ========================= ========= >> cs.com >> ========================= ========= >> matronics.com/contribution >> ========================= ========= >> > > 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > ________________________________ Message 3 _____________________________________ Time: 01:25:30 PM PST US Subject: Re: Yak-List: Air Compressor (?) Issue From: "Roger Kemp M.D." Pappy, how long are you flying the 17 this evening? I need to run up to 08a a fter I finish office procedures around 1530. 08a is 20 min N then MGM is 40 m in S from 08A down I 65. Doc Sent from my iPad On Oct 29, 2013, at 3:00 PM, James Goolsby wrote: > Doc, > I'm here at KMGM until 1630 (I've got be copilot on the 17 this evening). We'll be leaving tomorrow about noon. > > Pappy. > > Sent from my iPad from some where on The 3rd rock from the Sun. > > On Oct 15, 2013, at 20:46, "Roger Kemp M.D." wro te: > >> One thought, since there was a fire that involved the firewall were the c heck valves at the pop off valve rebuilt or replaced. Is it possible that th e lower check valve between the snot bottle and the pop off valve and the fi lter are reversed. Instead of the one way valve arrow on the check valve poi nting to the filter and theophylline off valve could it be pointing at the s not bottle. Did y'all re-assemble the H or was it done in the field? Is the f ilter patent or is it clogged up from carbon deposited? >> I saw your #2 in the summary list that referred to testing the H setup. W as it disassemble after ya'll shipped it. As you know the check valve direct ion will have a big impact on air flow. >> Just a though. >> Doc >> >> Sent from my iPad >> >> On Oct 15, 2013, at 4:09 PM, "Jill Gernetzke" wrote: >> >>> Group, >>> >>> We have met up with a head scratcher. I am throwing it out to the group to chew on: >>> >>> The Yak 52 owner purchased his aircraft on an insurance sale. The aircr aft had been totaled because of an engine fire. Attempts to talk to the ori ginal owners and learn more about the aircraft=99s history have been u nsuccessful. Originally, we were contacted because the air system was not b uilding pressure. A photo sent by the owner, elicited a remark by me that t here seemed to be a lot of oil in the banjo/outlet valve fitting. The compr essor itself was very dirty. >>> The owner cleaned the outlet valve with no appreciable change in output. >>> He then bought a "NOS" comp from a private party, installed it and it f ailed in 2.5 hours. This compressor had actually been overhauled by us in 2 006. The nuts stripped off of the 4 studs on the bottom end of the compress or (green case), allowing the top end off the compressor to hammer up and do wn. Oil was all over the back end of the engine. >>> >>> The customer then sent his original compressor for overhaul and run on o ur test bench. He installed this overhauled compressor and it failed after 4 0 minutes in flight. This time the 4 studs sheared off of the bottom end of t he compressor. >>> >>> He sent us both failed compressors, the drive and drive gear, shear coup ling, the FT-1 =9Csnot=9D valve and the pressure relief tee set up. We built one compressor out of the two failed units. The 4 stripped st uds were replaced with new studs and installed with Loctite. The compressor was test run and produced 925 psi. The pressure relief valve tee setup was tested =93 it relieved normally - rebuilt with a new piston, new sea ls in the one way checkvalves and the pressure set to 50 atm. (The pressure r elief valve had a Teflon seal which was in very poor condition.) The snot va lve was tested, flushed and retested. The compressor, gaskets and drive uni t were secured to one another in the proper alignment for the reinstall. >>> >>> The air compressor was returned to the customer and it was reinstalled w ithout attaching the steel air line. Everything was normal for about 1.5 hou rs of ground runs. >>> >>> A flight was completed with the steel coiled air line still not attached . The flight was normal. >>> >>> The steel line was reattached and 90 minutes of ground run time. He not iced that pressure was not building as it should and opened the cowling to f ind one of the 4 hold-down nuts backing off. He also reported that the other 3 nuts were not tight. The owner drilled and safety wired the nuts. >>> >>> (Note: There is a CRITICAL clearance that is set between the bottom of t he Stage I piston and the top of the Stage II cylinder. Over-tightening the se nuts will cause the top of the piston to hit the top of the Stage II cyli nder. Too much clearance and it bottoms out on the other end.) >>> >>> We received the compressor and installed new studs and steel locknuts wi th Loctite. The compressor has been returned but not run, yet. >>> >>> Here is what we know: >>> 1. The FT-1 Snot valve is was flushed and functioning properly. >>> 2. The pressure relief valve tee and checkvalves were all tested a nd the system functioned normally on a bench test, with the pressure relief v alve popping off at 750 psi. >>> 3. A new steel line was provided to the customer, but I do not kno w if this was installed. >>> 4. On the 4th installation of the compressor, we returned the comp ressor, shear coupling, drive pad and gear tie-wrapped as a unit for correct clocking. We received photo verification that the compressor drive was ins talled correctly. >>> 5. The compressor operated normally on the last run until the stee l line was attached to it. Then, 1 nut backed off and the other 3 were repo rted loose. Hence, we replaced the hex nuts/lockwashers with steel locknuts in case the lockwashers had failed and that was the only problem on the las t run. >>> 6. The force to shear the compressor studs is in excess of 22,000 l bs. >>> 7. The shear coupling appears to be a factory unit. A new one was sent to the customer, but returned back to me. >>> 8. The oil return holes in the accessory case are large and not pl ugged. >>> >>> In the 20+ years that we have been overhauling air compressors, we have n ever encountered this problem. Please use this problem as your own theoreti cal and reasoning challenge to put forth real possibilities =93graspin g at unicorns, rainbows or butterflies not allowed. : ) >>> >>> Jill >>> M-14P, Inc. >>> >>> >>> >>> >>> >>> ======================== >>> //www.matronics.com/Navigator?Yak-List >>> ======================== >>> cs.com >>> ======================== >>> matronics.com/contribution >>> ======================== >>> >> >> >> D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >> ist"">http://www.matronics.com/Navigator?Yak-List >> D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >> //forums.matronics.com >> D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >> ot;">http://www.matronics.com/contribution >> D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >> > > ========================== ========= ========================== ========= ========================== ========= ========================== ========= > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message yak-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Yak-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/yak-list Browse Digests http://www.matronics.com/digest/yak-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.