---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Fri 10/09/20: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:39 AM - CJ-6 flap issue (Jay McIntyre) 2. 03:55 AM - Re: CJ-6 flap issue (A. Dennis Savarese) 3. 04:21 AM - Re: CJ-6 flap issue (Mark Pennington) 4. 08:50 AM - Re: CJ-6 flap issue (Robin Hou) 5. 09:48 AM - Re: CJ-6 flap issue (Walter Lannon) 6. 04:25 PM - Re: CJ-6 flap issue (\) ________________________________ Message 1 _____________________________________ Time: 12:39:05 AM PST US From: Jay McIntyre Subject: Yak-List: CJ-6 flap issue Hi all, One of the CJ's we look after has an annoying trait in that when the aircraft has been sitting for a while and the air has bled off out of the system the flaps come down. As soon as air pressure is restored the flaps come back up. They function normally and we cannot work out why it is doing it. Have had flap actuator apart as part of routine inspections with no issues noted, both diverter valves apart (again no issues and they appear to be installed with correct orientation). Any thoughts? Regards, Jay New Zealand ________________________________ Message 2 _____________________________________ Time: 03:55:07 AM PST US From: "A. Dennis Savarese" Subject: Re: Yak-List: CJ-6 flap issue Jay,What happens if you put both flap handles in the neutral position when you leave the airplane and let it set for a period of time?=C2- Do the f laps drop down? You may have a main air valve leaking or the B nuts at the main air valve o r at the main air tank leaking.=C2- Pay particular attention to the flare s on the tubing under the B nuts because they are prone to cracking because of over-tightening.=C2- Use the soapy water spray test on the fittings t o see if there are any leaks.=C2- The main air valve may be suspect as we ll. Have you rebuilt the check valves on the firewall? In your post you said the diverter valves and the flap actuator were taken apart and inspected with no issues noted.=C2- But have you actually overh auled them?=C2- Although you may not see anything defective during a disa ssembly, like for example the internal seals, they could easily be worn and allowing air to bleed past them.=C2-=C2- How long ago were the diverte r valves and the flap actuator overhauled with new internal components? Dennis On Friday, October 9, 2020, 3:41:10 AM EDT, Jay McIntyre wrote: Hi all,One of the CJ's we look after has an annoying trait=C2-in that wh en the aircraft has been sitting for a while and the air has bled off out o f the system the flaps come down. As soon as air pressure is restored the flaps come back up. They function n ormally and we cannot work out why it is doing it. Have had flap actuator apart as part of routine inspections with no issues noted, both diverter=C2-valves apart (again no issues and they appear to be installed with correct orientation).Any thoughts? Regards, Jay New Zealand ________________________________ Message 3 _____________________________________ Time: 04:21:12 AM PST US From: Mark Pennington Subject: Re: Yak-List: CJ-6 flap issue Jay Dennis has good suggestions. I would ask, how far down does the flap travel. If it is dropping down more than 1/2 inch check your flap bungee. I had to replace mine, it looked fine, but on a very close inspection I found many of the strands of rubber broken in several places. Hope this helps. I know that Doug stocks the parts. Mark N621CJ On Fri, Oct 9, 2020 at 6:59 AM A. Dennis Savarese < dsavarese0812@bellsouth.net> wrote: > Jay, > What happens if you put both flap handles in the neutral position when you > leave the airplane and let it set for a period of time? Do the flaps drop > down? > > You may have a main air valve leaking or the B nuts at the main air valve > or at the main air tank leaking. Pay particular attention to the flares on > the tubing under the B nuts because they are prone to cracking because of > over-tightening. Use the soapy water spray test on the fittings to see if > there are any leaks. The main air valve may be suspect as well. > > Have you rebuilt the check valves on the firewall? > > In your post you said the diverter valves and the flap actuator were taken > apart and inspected with no issues noted. But have you actually overhauled > them? Although you may not see anything defective during a disassembly, > like for example the internal seals, they could easily be worn and allowing > air to bleed past them. How long ago were the diverter valves and the > flap actuator overhauled with new internal components? > Dennis > > > On Friday, October 9, 2020, 3:41:10 AM EDT, Jay McIntyre < > cjaviator@gmail.com> wrote: > > > Hi all, > One of the CJ's we look after has an annoying trait in that when the > aircraft has been sitting for a while and the air has bled off out of the > system the flaps come down. > As soon as air pressure is restored the flaps come back up. They function > normally and we cannot work out why it is doing it. > Have had flap actuator apart as part of routine inspections with no issues > noted, both diverter valves apart (again no issues and they appear to be > installed with correct orientation). > Any thoughts? > > Regards, Jay > New Zealand > ________________________________ Message 4 _____________________________________ Time: 08:50:45 AM PST US From: Robin Hou Subject: Re: Yak-List: CJ-6 flap issue Isn't the=C2-bungee cord supposed to keep the flap up when air is deplete d? Just a thought :-) Sent from Yahoo Mail on Android On Fri, Oct 9, 2020 at 4:34, Mark Pennington wrote: Jay Dennis has good suggestions.=C2- =C2-I would ask, how far down does the flap travel.=C2- If it is dropping down more than 1/2 inch check your fl ap bungee.=C2- =C2-I had to replace mine, it looked fine, but on a very close inspection I found many of the strands of rubber broken in several p laces.=C2- =C2-Hope this helps.=C2- =C2-I know that Doug stocks the parts. MarkN621CJ On Fri, Oct 9, 2020 at 6:59 AM A. Dennis Savarese wrote: Jay,What happens if you put both flap handles in the neutral position when you leave the airplane and let it set for a period of time?=C2- Do the f laps drop down? You may have a main air valve leaking or the B nuts at the main air valve o r at the main air tank leaking.=C2- Pay particular attention to the flare s on the tubing under the B nuts because they are prone to cracking because of over-tightening.=C2- Use the soapy water spray test on the fittings t o see if there are any leaks.=C2- The main air valve may be suspect as we ll. Have you rebuilt the check valves on the firewall? In your post you said the diverter valves and the flap actuator were taken apart and inspected with no issues noted.=C2- But have you actually overh auled them?=C2- Although you may not see anything defective during a disa ssembly, like for example the internal seals, they could easily be worn and allowing air to bleed past them.=C2-=C2- How long ago were the diverte r valves and the flap actuator overhauled with new internal components? Dennis On Friday, October 9, 2020, 3:41:10 AM EDT, Jay McIntyre wrote: Hi all,One of the CJ's we look after has an annoying trait=C2-in that wh en the aircraft has been sitting for a while and the air has bled off out o f the system the flaps come down. As soon as air pressure is restored the flaps come back up. They function n ormally and we cannot work out why it is doing it. Have had flap actuator apart as part of routine inspections with no issues noted, both diverter=C2-valves apart (again no issues and they appear to be installed with correct orientation).Any thoughts? Regards, Jay New Zealand ________________________________ Message 5 _____________________________________ Time: 09:48:49 AM PST US From: "Walter Lannon" Subject: Re: Yak-List: CJ-6 flap issue Hi Jay; Is the bungee cord still attached and in reasonable condition? Cheers; Walt From: Jay McIntyre Sent: Friday, October 09, 2020 12:37 AM Subject: Yak-List: CJ-6 flap issue Hi all, One of the CJ's we look after has an annoying trait in that when the aircra ft has been sitting for a while and the air has bled off out of the system the flaps come down. As soon as air pressure is restored the flaps come back up. They function n ormally and we cannot work out why it is doing it. Have had flap actuator apart as part of routine inspections with no issues noted, both diverter valves apart (again no issues and they appear to be in stalled with correct orientation). Any thoughts? Regards, Jay New Zealand -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ________________________________ Message 6 _____________________________________ Time: 04:25:29 PM PST US From: "\"" Subject: RE: Yak-List: CJ-6 flap issue There should be a bungee cord that would hold the flap up. On Friday, October 9, 2020 Jay McIntyre wrote: Hi all,One of the CJ's we look after has an annoying trait=C2-in that whe n the aircraft has been sitting for a while and the air has bled off out of the system the flaps come down. As soon as air pressure is restored the flaps come back up. They function n ormally and we cannot work out why it is doing it. Have had flap actuator apart as part of routine inspections with no issues noted, both diverter=C2-valves apart (again no issues and they appear to be installed with correct orientation).Any thoughts? Regards, Jay New Zealand ------------------------------------------------------------------------------------- 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.