---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Sat 09/28/13: 7 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 01:13 AM - Re: Hydrostatic tests (Jan Mevis) 2. 01:47 AM - Re: Hydrostatic tests (Richard Goode) 3. 02:01 AM - Re: Hydrostatic tests (Jan Mevis) 4. 05:21 AM - Yak Gills or Sukhoi Iris (Peter Miramon) 5. 08:49 AM - Re: Hydrostatic tests (Todd McCutchan) 6. 09:41 AM - Re: Hydrostatic tests (Walter Lannon) 7. 11:16 AM - Re: Hydrostatic tests (Jan Mevis) ________________________________ Message 1 _____________________________________ Time: 01:13:30 AM PST US Subject: Re: Yak-List: Hydrostatic tests From: Jan Mevis In France, every five years. Jan From: Todd McCutchan Subject: Yak-List: Hydrostatic tests How often is the hydrostatic test of the main and emergency bottles required? Todd McCutchan Fast Aircraft T-34A & Yak-50 Cell - 260.402.1740 Email: todd@fastaircraft.com Skype: tmccutchan Web: www.fastaircraft.com & www.toddmccutchanairshows.com ________________________________ Message 2 _____________________________________ Time: 01:47:35 AM PST US From: "Richard Goode" Subject: RE: Yak-List: Hydrostatic tests Hi Todd, I can tell you from experience that the real problem in both undercarriages and the high-pressure air bottles is water, and so many Western pilots do not methodically drain the system at least every day. Once water starts getting into the retraction cylinders, they quickly corrode, and while they should have an overhaul life of only six years, this can be dramatically reduced. Equally, I can tell you that we had a yak 50 where the high-pressure bottle blew up while the aircraft was on the ground, causing incredible damage, and certainly would have brought the aircraft down had it been airborne! Again, totally due to water getting inside and corroding the bottle internally. My own leaf is to test the bottle to 100 bar (twice operating pressure) every year! Regards Richard Richard Goode Aerobatics Rhodds Farm Lyonshall Hereford HR5 3LW Tel: +44 (0) 1544 340120 Fax: +44 (0) 1544 340129 www.russianaeros.com From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Todd McCutchan Sent: 28 September 2013 00:44 Subject: Yak-List: Hydrostatic tests How often is the hydrostatic test of the main and emergency bottles required? Todd McCutchan Fast Aircraft T-34A & Yak-50 Cell - 260.402.1740 Email: todd@fastaircraft.com Skype: tmccutchan Web: www.fastaircraft.com & www.toddmccutchanairshows.com -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. ________________________________ Message 3 _____________________________________ Time: 02:01:03 AM PST US Subject: Re: Yak-List: Hydrostatic tests From: Jan Mevis You are absolutely right Richard. And although according to the Kardex, I only have to check hydrostatically every 5 years, I do it annually too. I can imagine that this is less urgent in dry desert-like regions, but in Western Europe it's appropriate to do it yearly. Same thing: servicing of the gear actuators each winter, plane on jacks, with the whole scenario of swing-testing. Jan From: Richard Goode Subject: RE: Yak-List: Hydrostatic tests Hi Todd, I can tell you from experience that the real problem in both undercarriages and the high-pressure air bottles is water, and so many Western pilots do not methodically drain the system at least every day. Once water starts getting into the retraction cylinders, they quickly corrode, and while they should have an overhaul life of only six years, this can be dramatically reduced. Equally, I can tell you that we had a yak 50 where the high-pressure bottle blew up while the aircraft was on the ground, causing incredible damage, and certainly would have brought the aircraft down had it been airborne! Again, totally due to water getting inside and corroding the bottle internally. My own leaf is to test the bottle to 100 bar (twice operating pressure) every year! Regards Richard Richard Goode Aerobatics Rhodds Farm Lyonshall Hereford HR5 3LW Tel: +44 (0) 1544 340120 Fax: +44 (0) 1544 340129 www.russianaeros.com From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Todd McCutchan Sent: 28 September 2013 00:44 Subject: Yak-List: Hydrostatic tests How often is the hydrostatic test of the main and emergency bottles required? Todd McCutchan Fast Aircraft T-34A & Yak-50 Cell - 260.402.1740 Email: todd@fastaircraft.com Skype: tmccutchan Web: www.fastaircraft.com & www.toddmccutchanairshows.com http://www.matronics.com/Navigator?Yak-List http://forums.matronics.com http://www.matronics.com/contribution -- This message has been scanned for viruses and dangerous content by MailScanner , and is believed to be clean. ________________________________ Message 4 _____________________________________ Time: 05:21:16 AM PST US Subject: Yak-List: Yak Gills or Sukhoi Iris From: Peter Miramon Still in need of a set of Gills or a Sukhoi iris for my Yak 55 M. If you know of any available preferably the iris please contact me @ miramon@comcast.net or call me @ 503-705-8530. Thanks Peter Miramon Yak 55M N1001L Sent from my iPad ________________________________ Message 5 _____________________________________ Time: 08:49:31 AM PST US Subject: Re: Yak-List: Hydrostatic tests From: Todd McCutchan Thanks guys. I live in AZ so will have a think about the bottles. Obviously a good scopin g is in order annually. I have seen some pics of the 50 that the bottle blew and have no desire for a repeat performance over here. So landing gear seals every 6 years then? Todd McCutchan T-34A & Yak-50 Cell (260) 402-1740 E-mail todd@fastaircraft.com www.fastaircraft.com > On Sep 28, 2013, at 1:58 AM, Jan Mevis wrote: > > You are absolutely right Richard. > > And although according to the Kardex, I only have to check hydrostatically every 5 years, I do it annually too. > > I can imagine that this is less urgent in dry desert-like regions, but in W estern Europe it's appropriate to do it yearly. > > Same thing: servicing of the gear actuators each winter, plane on jacks, w ith the whole scenario of swing-testing. > > Jan > > From: Richard Goode > Date: Saturday 28 September 2013 10:45 > To: "yak-list@matronics.com" > Subject: RE: Yak-List: Hydrostatic tests > > Hi Todd, > > I can tell you from experience that the real problem in both undercarriage s and the high-pressure air bottles is water, and so many Western pilots do n ot methodically drain the system at least every day. > > Once water starts getting into the retraction cylinders, they quickly corr ode, and while they should have an overhaul life of only six years, this can be dramatically reduced. Equally, I can tell you that we had a yak 50 where the high-pressure bottle blew up while the aircraft was on the ground, caus ing incredible damage, and certainly would have brought the aircraft down ha d it been airborne! Again, totally due to water getting inside and corroding the bottle internally. > > My own leaf is to test the bottle to 100 bar (twice operating pressure) ev ery year! > > Regards > > Richard > > Richard Goode Aerobatics > Rhodds Farm > Lyonshall > Hereford > HR5 3LW > > Tel: +44 (0) 1544 340120 > Fax: +44 (0) 1544 340129 > www.russianaeros.com > > From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@ma tronics.com] On Behalf Of Todd McCutchan > Sent: 28 September 2013 00:44 > To: yak-list@matronics.com > Subject: Yak-List: Hydrostatic tests > > How often is the hydrostatic test of the main and emergency bottles requir ed? > > Todd McCutchan > Fast Aircraft > T-34A & Yak-50 > > Cell - 260.402.1740 > > Email: todd@fastaircraft.com > Skype: tmccutchan > Web: www.fastaircraft.com & www.toddmccutchanairshows.com > > > > http://www.matronics.com/Navigator?Yak-List > http://forums.matronics.com > http://www.matronics.com/contribution > > > -- > This message has been scanned for viruses and > dangerous content by MailScanner, and is > believed to be clean. > > > ww.matronics.com/Navigator?Yak-List > com > ronics.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 6 _____________________________________ Time: 09:41:06 AM PST US From: "Walter Lannon" Subject: Re: Yak-List: Hydrostatic tests Richard; I hope you are having that done by a qualified shop using the hydrostatic method. At 100 Bar you are exceeding the allowable test limit if the Russian specs. are the same as Western. That is typically 5/3 X the max operating pressure. However this does not apply to a welded bottle. The CJ6 bottles are welded and the max. hydro test pressure given is 75 Bar. Less than the 83 Bar allowed for a non-welded bottle at the same operating pressure. I assume the Russian bottles are also welded. Walt From: Richard Goode Sent: Saturday, September 28, 2013 1:45 AM Subject: RE: Yak-List: Hydrostatic tests Hi Todd, I can tell you from experience that the real problem in both undercarriages and the high-pressure air bottles is water, and so many Western pilots do not methodically drain the system at least every day. Once water starts getting into the retraction cylinders, they quickly corrode, and while they should have an overhaul life of only six years, this can be dramatically reduced. Equally, I can tell you that we had a yak 50 where the high-pressure bottle blew up while the aircraft was on the ground, causing incredible damage, and certainly would have brought the aircraft down had it been airborne! Again, totally due to water getting inside and corroding the bottle internally. My own leaf is to test the bottle to 100 bar (twice operating pressure) every year! Regards Richard Richard Goode Aerobatics Rhodds Farm Lyonshall Hereford HR5 3LW Tel: +44 (0) 1544 340120 Fax: +44 (0) 1544 340129 www.russianaeros.com From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Todd McCutchan Sent: 28 September 2013 00:44 Subject: Yak-List: Hydrostatic tests How often is the hydrostatic test of the main and emergency bottles required? Todd McCutchan Fast Aircraft T-34A & Yak-50 Cell - 260.402.1740 Email: todd@fastaircraft.com Skype: tmccutchan Web: www.fastaircraft.com & www.toddmccutchanairshows.com http://www.matronics.com/Navigator?Yak-Listhttp://forums.matronics.comhtt p://www.matronics.com/contribution -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. ________________________________ Message 7 _____________________________________ Time: 11:16:28 AM PST US Subject: Re: Yak-List: Hydrostatic tests From: Jan Mevis We have them checked at 75 bar, in France. That should be enough. Jan From: Walter Lannon Subject: Re: Yak-List: Hydrostatic tests Richard; I hope you are having that done by a qualified shop using the hydrostatic method. At 100 Bar you are exceeding the allowable test limit if the Russian specs. are the same as Western. That is typically 5/3 X the max operating pressure. However this does not apply to a welded bottle. The CJ6 bottles are welded and the max. hydro test pressure given is 75 Bar. Less than the 83 Bar allowed for a non-welded bottle at the same operating pressure. I assume the Russian bottles are also welded. Walt From: Richard Goode Sent: Saturday, September 28, 2013 1:45 AM Subject: RE: Yak-List: Hydrostatic tests Hi Todd, I can tell you from experience that the real problem in both undercarriages and the high-pressure air bottles is water, and so many Western pilots do not methodically drain the system at least every day. Once water starts getting into the retraction cylinders, they quickly corrode, and while they should have an overhaul life of only six years, this can be dramatically reduced. Equally, I can tell you that we had a yak 50 where the high-pressure bottle blew up while the aircraft was on the ground, causing incredible damage, and certainly would have brought the aircraft down had it been airborne! Again, totally due to water getting inside and corroding the bottle internally. My own leaf is to test the bottle to 100 bar (twice operating pressure) every year! Regards Richard Richard Goode Aerobatics Rhodds Farm Lyonshall Hereford HR5 3LW Tel: +44 (0) 1544 340120 Fax: +44 (0) 1544 340129 www.russianaeros.com From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Todd McCutchan Sent: 28 September 2013 00:44 Subject: Yak-List: Hydrostatic tests How often is the hydrostatic test of the main and emergency bottles required? Todd McCutchan Fast Aircraft T-34A & Yak-50 Cell - 260.402.1740 Email: todd@fastaircraft.com Skype: tmccutchan Web: www.fastaircraft.com & www.toddmccutchanairshows.com http://www.matronics.com/Navigator?Yak-List http://forums.matronics.com http://www.matronics.com/contribution -- This message has been scanned for viruses and dangerous content by MailScanner , and is believed to be clean. href="http://www.matronics.com/Navigator?Yak-List">http://www.matronics.com/ Navigator?Yak-List href="http://forums.matronics.com">http://forums.matronics.com href="http://www.matronics.com/contribution">http://www.matronics.com/c ------------------------------------------------------------------------------------- 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.