Yak-List Digest Archive

Thu 08/02/07


Total Messages Posted: 12



Today's Message Index:
----------------------
 
     1. 12:37 AM - Re: Airplanes that talk to you.... (Jan Mevis)
     2. 05:08 AM - Re: Airplanes that talk to you.... (A. Dennis Savarese)
     3. 06:32 AM - Re: Airplanes that talk to you.... (Roger Kemp)
     4. 07:39 AM - Re: Airplanes that talk to you.... (Doug Sapp)
     5. 07:39 AM - Re: Airplanes that talk to you.... (Tim Gagnon)
     6. 08:27 AM - Gear retract test (Cliff Coy)
     7. 09:09 AM - Re: Re: Airplanes that talk to you.... (Doug Sapp)
     8. 09:27 AM - Re: Airplanes that talk to you.... (Tim Gagnon)
     9. 10:17 AM - Red Air Fall Fling III (viperdoc)
    10. 01:40 PM - Re: Airplanes that talk to you.... (Jan Mevis)
    11. 03:19 PM - Re: Beware (Brad M.)
    12. 08:27 PM - brake problems (HodgeJW@aol.com)
 
 
 


Message 1


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    Time: 12:37:59 AM PST US
    From: "Jan Mevis" <jan.mevis@informavia.be>
    Subject: Airplanes that talk to you....
    Very interesting, Tim. Indeed, I also listen very closely. Sometimes you also have to watch. Yesterday I had an experienced friend fly my plane. So I could see it fly. I was rather amazed to see that the right gear leg all of a sudden VIBRATED when he pulled the gear in at takeoff. Afterwards I asked him if he noticed anything special but he did not. I'm going to put my 50 on Yaks to check the whole gear. Does anyone have any idea what may have caused this vibration ? It was very strange : the right leg moving in, and after having turned about 10 degrees, it oscillated rapidly fore-after, but only for a second, and then it moved further in and locked without a problem. I could not see whether the same problem happened at the landing. Jan Mevis RA2005K YK50 -----Original Message----- From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Tim Gagnon Sent: donderdag 2 augustus 2007 2:12 Subject: Yak-List: Airplanes that talk to you.... I have got some decent time in various types of airplanes from jets to props. Some have avionics that tell you when something is wrong or about to go wrong. Some airplanes have different ways of talking to you. The Yak is pretty good at talking to you and telling you there is an issue. I recently had some air issues that were tracked down to a small seal leak in a gear actuator. So, off comes both acuators for overhaul. Well, that small seal leak probably kept me from having a catastrophic gear actuator failure which would have prevent the gear from going down if they were up and locked. The end cap on the right acuator was cracked and near failure. Had the small leak not happened first, the cap probably would have gone! I certainly did not like to find out that I had a bad cap but it sure beats landing gear up or worse..one down and the other up! Two new caps are being machined and will be made better and stronger than the old ones. (By the way, there was JB weld on the acutator that failed. I am pretty sure that the Russians do not use JB Weld....two people have owned the airplane since it was brought to the US..but just one operator) While dealing with the acutator issue, I took a look at little shimmy that had just started in the tailwheel. I had just replaced the tire and figured that would cure the problem. It needed to be changed. No joy on the shimmy fix. Uhmmmm?? A week or so later, I find a new problem, the airplane was moved with the TW lock engaged damaging the TW fork. Damn....not again (a shop busted it last time) Out comes the fork for a repair and I figured now was as good a time to put the new TW shock cap that TJ and Mike Hanshew made the -50 community last year. The reason a new was made was that one -50 owners failed and could have ended worse than it did. So doing what Americans do best, two guys in AZ adapted and overcame and helped keep these birds flying. Well, good thing I had that little shimmy, I pulled the shock out and the bearing that was back there fell out in my hand! I am not sure how many landings she had left in her but I would guess not many before that bearing would hav! e failed and caused me to lose control of the ass end of the airplane. That shimmy was the whisper before a scream! I have come to respect the things this airplane tells me. I am guessing it has saved me more than once. Listen to your airplane...it speaks in a language evry pilot should understand. For you -50 folks, the folks in AZ are doing some good things with the airplane. Get a hold of them and do yourself a favor. Have some parts on the shelf for your next annual! Read this topic online here: http://forums.matronics.com/viewtopic.php?p=127036#127036


    Message 2


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    Time: 05:08:55 AM PST US
    From: "A. Dennis Savarese" <dsavarese@elmore.rr.com>
    Subject: Re: Airplanes that talk to you....
    Jan, My first guess would be the actuator. Second guess would be the bushings in the gear leg binding. I think when you put it on jacks and do a retract test you'll find the problem. You may have to disconnect the actuator arm from the gear leg and do another retract test to isolate the problem. Something in the mechanism is most likely binding. Dennis ----- Original Message ----- From: "Jan Mevis" <jan.mevis@informavia.be> Sent: Thursday, August 02, 2007 2:37 AM Subject: RE: Yak-List: Airplanes that talk to you.... > > Very interesting, Tim. > Indeed, I also listen very closely. Sometimes you also have to watch. > > Yesterday I had an experienced friend fly my plane. So I could see it fly. > I > was rather amazed to see that the right gear leg all of a sudden VIBRATED > when he pulled the gear in at takeoff. Afterwards I asked him if he > noticed > anything special but he did not. I'm going to put my 50 on Yaks to check > the > whole gear. > > Does anyone have any idea what may have caused this vibration ? It was > very > strange : the right leg moving in, and after having turned about 10 > degrees, > it oscillated rapidly fore-after, but only for a second, and then it moved > further in and locked without a problem. I could not see whether the same > problem happened at the landing. > > > Jan Mevis > RA2005K > YK50 > > -----Original Message----- > From: owner-yak-list-server@matronics.com > [mailto:owner-yak-list-server@matronics.com] On Behalf Of Tim Gagnon > Sent: donderdag 2 augustus 2007 2:12 > To: yak-list@matronics.com > Subject: Yak-List: Airplanes that talk to you.... > > > I have got some decent time in various types of airplanes from jets to > props. Some have avionics that tell you when something is wrong or about > to > go wrong. Some airplanes have different ways of talking to you. The Yak is > pretty good at talking to you and telling you there is an issue. > > I recently had some air issues that were tracked down to a small seal leak > in a gear actuator. So, off comes both acuators for overhaul. Well, that > small seal leak probably kept me from having a catastrophic gear actuator > failure which would have prevent the gear from going down if they were up > and locked. The end cap on the right acuator was cracked and near failure. > Had the small leak not happened first, the cap probably would have gone! I > certainly did not like to find out that I had a bad cap but it sure beats > landing gear up or worse..one down and the other up! Two new caps are > being > machined and will be made better and stronger than the old ones. (By the > way, there was JB weld on the acutator that failed. I am pretty sure that > the Russians do not use JB Weld....two people have owned the airplane > since > it was brought to the US..but just one operator) > > While dealing with the acutator issue, I took a look at little shimmy that > had just started in the tailwheel. I had just replaced the tire and > figured > that would cure the problem. It needed to be changed. No joy on the shimmy > fix. Uhmmmm?? A week or so later, I find a new problem, the airplane was > moved with the TW lock engaged damaging the TW fork. Damn....not again (a > shop busted it last time) Out comes the fork for a repair and I figured > now > was as good a time to put the new TW shock cap that TJ and Mike Hanshew > made > the -50 community last year. The reason a new was made was that one -50 > owners failed and could have ended worse than it did. So doing what > Americans do best, two guys in AZ adapted and overcame and helped keep > these > birds flying. Well, good thing I had that little shimmy, I pulled the > shock > out and the bearing that was back there fell out in my hand! I am not sure > how many landings she had left in her but I would guess not many before > that > bearing would hav! > e failed and caused me to lose control of the ass end of the airplane. > That > shimmy was the whisper before a scream! > > I have come to respect the things this airplane tells me. I am guessing it > has saved me more than once. Listen to your airplane...it speaks in a > language evry pilot should understand. > > > For you -50 folks, the folks in AZ are doing some good things with the > airplane. Get a hold of them and do yourself a favor. Have some parts on > the > shelf for your next annual! > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=127036#127036 > > >


    Message 3


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    Time: 06:32:07 AM PST US
    From: "Roger Kemp" <viperdoc@mindspring.com>
    Subject: Airplanes that talk to you....
    Jan, You need to look at all your gear attachment points. From the actuator attachment bolt in the wing to the push rod attachment on the strut. Also look at the 4 bolts that anchor the strut to the wing (doubt that is the culprit though). But it will confirm the structural integrity of the gear and gear box. Suspect it has more to do with the actuator movement not completely seating as it withdraws the strut. Something causing a transient binding as it approaches completion of the retraction. Have you noticed an scuffing on the sides of the gear as well? You said this was a fore - aft vibration? Not a rotational (side to side) vibration. Rotational would be more like the bushings in the scissors wearing. Jacks and a retraction test is a good idea. That should help to isolate it. Hope this helps, Doc -----Original Message----- From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Jan Mevis Sent: Thursday, August 02, 2007 2:37 AM Subject: RE: Yak-List: Airplanes that talk to you.... Very interesting, Tim. Indeed, I also listen very closely. Sometimes you also have to watch. Yesterday I had an experienced friend fly my plane. So I could see it fly. I was rather amazed to see that the right gear leg all of a sudden VIBRATED when he pulled the gear in at takeoff. Afterwards I asked him if he noticed anything special but he did not. I'm going to put my 50 on Yaks to check the whole gear. Does anyone have any idea what may have caused this vibration ? It was very strange : the right leg moving in, and after having turned about 10 degrees, it oscillated rapidly fore-after, but only for a second, and then it moved further in and locked without a problem. I could not see whether the same problem happened at the landing. Jan Mevis RA2005K YK50 -----Original Message----- From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Tim Gagnon Sent: donderdag 2 augustus 2007 2:12 Subject: Yak-List: Airplanes that talk to you.... I have got some decent time in various types of airplanes from jets to props. Some have avionics that tell you when something is wrong or about to go wrong. Some airplanes have different ways of talking to you. The Yak is pretty good at talking to you and telling you there is an issue. I recently had some air issues that were tracked down to a small seal leak in a gear actuator. So, off comes both acuators for overhaul. Well, that small seal leak probably kept me from having a catastrophic gear actuator failure which would have prevent the gear from going down if they were up and locked. The end cap on the right acuator was cracked and near failure. Had the small leak not happened first, the cap probably would have gone! I certainly did not like to find out that I had a bad cap but it sure beats landing gear up or worse..one down and the other up! Two new caps are being machined and will be made better and stronger than the old ones. (By the way, there was JB weld on the acutator that failed. I am pretty sure that the Russians do not use JB Weld....two people have owned the airplane since it was brought to the US..but just one operator) While dealing with the acutator issue, I took a look at little shimmy that had just started in the tailwheel. I had just replaced the tire and figured that would cure the problem. It needed to be changed. No joy on the shimmy fix. Uhmmmm?? A week or so later, I find a new problem, the airplane was moved with the TW lock engaged damaging the TW fork. Damn....not again (a shop busted it last time) Out comes the fork for a repair and I figured now was as good a time to put the new TW shock cap that TJ and Mike Hanshew made the -50 community last year. The reason a new was made was that one -50 owners failed and could have ended worse than it did. So doing what Americans do best, two guys in AZ adapted and overcame and helped keep these birds flying. Well, good thing I had that little shimmy, I pulled the shock out and the bearing that was back there fell out in my hand! I am not sure how many landings she had left in her but I would guess not many before that bearing would hav! e failed and caused me to lose control of the ass end of the airplane. That shimmy was the whisper before a scream! I have come to respect the things this airplane tells me. I am guessing it has saved me more than once. Listen to your airplane...it speaks in a language evry pilot should understand. For you -50 folks, the folks in AZ are doing some good things with the airplane. Get a hold of them and do yourself a favor. Have some parts on the shelf for your next annual! Read this topic online here: http://forums.matronics.com/viewtopic.php?p=127036#127036


    Message 4


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    Time: 07:39:35 AM PST US
    From: Doug Sapp <rvfltd@televar.com>
    Subject: Re: Airplanes that talk to you....
    Jan, I am pretty sure that most of what you are feeling is the "scrubbing" of the ram as it moves in the cylinder, but I would agree that you need to get the aircraft on jacks and give it a through looking at. When I overhaul actuator clyinders I always check to see if the ram extention and retraction is smooth and fluid in it's travel. I have seen many that moved is short jerks, sort of "stutters" in and out. This is usally caused by one of three things, incificient flow of air (air flow is restricted and it has to move the ram then build up more pressure, move the ram again, and so on), 2nd it could be that the wrong 0 rings were used at overhaul and the ram is too tight in the cly, or 3rd it might be that who ever is maintaining the aircraft has injected an excessive amount of tool oil into the system and has washed all the high pressure grease off the cylinder walls. The latter reason is most likely if the actuators have been in the aircraft for a time and have been operating properly up to now. Limited use of air tool oil in the pneumatic system is a good thing up to a point, but you should not exceed the spec in the manual. Always Yakin, Doug Sapp Mevis wrote: > >Very interesting, Tim. >Indeed, I also listen very closely. Sometimes you also have to watch. > >Yesterday I had an experienced friend fly my plane. So I could see it fly. I >was rather amazed to see that the right gear leg all of a sudden VIBRATED >when he pulled the gear in at takeoff. Afterwards I asked him if he noticed >anything special but he did not. I'm going to put my 50 on Yaks to check the >whole gear. > >Does anyone have any idea what may have caused this vibration ? It was very >strange : the right leg moving in, and after having turned about 10 degrees, >it oscillated rapidly fore-after, but only for a second, and then it moved >further in and locked without a problem. I could not see whether the same >problem happened at the landing. > > >Jan Mevis >RA2005K >YK50 > >-----Original Message----- >From: owner-yak-list-server@matronics.com >[mailto:owner-yak-list-server@matronics.com] On Behalf Of Tim Gagnon >Sent: donderdag 2 augustus 2007 2:12 >To: yak-list@matronics.com >Subject: Yak-List: Airplanes that talk to you.... > > >I have got some decent time in various types of airplanes from jets to >props. Some have avionics that tell you when something is wrong or about to >go wrong. Some airplanes have different ways of talking to you. The Yak is >pretty good at talking to you and telling you there is an issue. > >I recently had some air issues that were tracked down to a small seal leak >in a gear actuator. So, off comes both acuators for overhaul. Well, that >small seal leak probably kept me from having a catastrophic gear actuator >failure which would have prevent the gear from going down if they were up >and locked. The end cap on the right acuator was cracked and near failure. >Had the small leak not happened first, the cap probably would have gone! I >certainly did not like to find out that I had a bad cap but it sure beats >landing gear up or worse..one down and the other up! Two new caps are being >machined and will be made better and stronger than the old ones. (By the >way, there was JB weld on the acutator that failed. I am pretty sure that >the Russians do not use JB Weld....two people have owned the airplane since >it was brought to the US..but just one operator) > >While dealing with the acutator issue, I took a look at little shimmy that >had just started in the tailwheel. I had just replaced the tire and figured >that would cure the problem. It needed to be changed. No joy on the shimmy >fix. Uhmmmm?? A week or so later, I find a new problem, the airplane was >moved with the TW lock engaged damaging the TW fork. Damn....not again (a >shop busted it last time) Out comes the fork for a repair and I figured now >was as good a time to put the new TW shock cap that TJ and Mike Hanshew made >the -50 community last year. The reason a new was made was that one -50 >owners failed and could have ended worse than it did. So doing what >Americans do best, two guys in AZ adapted and overcame and helped keep these >birds flying. Well, good thing I had that little shimmy, I pulled the shock >out and the bearing that was back there fell out in my hand! I am not sure >how many landings she had left in her but I would guess not many before that >bearing would hav! > e failed and caused me to lose control of the ass end of the airplane. That >shimmy was the whisper before a scream! > >I have come to respect the things this airplane tells me. I am guessing it >has saved me more than once. Listen to your airplane...it speaks in a >language evry pilot should understand. > > >For you -50 folks, the folks in AZ are doing some good things with the >airplane. Get a hold of them and do yourself a favor. Have some parts on the >shelf for your next annual! > > >Read this topic online here: > >http://forums.matronics.com/viewtopic.php?p=127036#127036 > > > >


    Message 5


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    Time: 07:39:57 AM PST US
    Subject: Re: Airplanes that talk to you....
    From: "Tim Gagnon" <NiftyYak50@fuse.net>
    Be very careful with the retraction test. It is a bit unnerving. I have done it a few times and every time it scares the hell out of me. I do not like airplanes on jacks. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=127156#127156


    Message 6


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    Time: 08:27:06 AM PST US
    From: Cliff Coy <cliff@gesoco.com>
    Subject: Gear retract test
    I don't want to stomp on any toes, so please don't take it that way. I've seen and heard of too many people who are scared out of their wits about doing gear testing because they're afraid the plane will hop off the jacks. If you're blasting the gear down, then you're doing it wrong and will damage the gear system. Below is a generic version of the correct way to perform a gear retraction test for Yaks on jacks and the gear selector in the down position: 1) MAIN AIR- OPEN 2) SELECT GEAR- UP 3) VERIFY GEAR UP- CHECK UPLOCKS ETC 4) MAIN AIR - CLOSE 5) EMERGENCY AIR- OPEN QUICKLY 6) VERIFY GEAR UNLOCKS FROM THE UP POSITION The gear should be caught in between the up and down positions. This is a good time to look over the gear swing action by hand. 7) SELECT GEAR- NEUTRAL 8) VERIFY GEAR DOWN AND LOCKED 9) EMERGENCY AIR- CLOSE 10) SELECT GEAR- DOWN 11) BLEED OFF SYSTEM PRESSURE FOR 2 MINUTES I usually actuate the parking brake and alternate left and right rudder until the "fart" valve releases. It's important to wait a good minute after the valve releases to ensure the emergency system is purged before engaging the main air system. If there's any residual pressure in the emergency side the shuttle valves on the gear may not switch over completely to the main system. 12) MAIN AIR- OPEN 13) SELECT GEAR- UP 14) VERIFY GEAR UP 15) SELECT GEAR- DOWN 16) VERIFY GEAR DOWN AND LOCKED With best regards to all, Cliff Tim Gagnon wrote: > >Be very careful with the retraction test. It is a bit unnerving. I have done it a few times and every time it scares the hell out of me. I do not like airplanes on jacks. > > >Read this topic online here: > >http://forums.matronics.com/viewtopic.php?p=127156#127156 > > > >


    Message 7


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    Time: 09:09:26 AM PST US
    From: Doug Sapp <rvfltd@televar.com>
    Subject: Re: Airplanes that talk to you....
    Tim and all, Retraction tests should not be something that you should be afraid of. You should only be afraid if you are trying to do the test without the proper equipment. If you are trying to do a retraction test without a full set of 4 jacks you really SHOULD be scared. The "headed" jack which supports the engine is a must as is the tail jack. If you don't have a tail jack you can get by with a stand of some type but the standard issue tail jack works the best. I know of at least one 50 that ended up on the floor with both jacks stuck though the wings, a CJ's tail broke the flimsy sawhorse tail stand and it squatted so hard that it kinked the tail cone and the broken saw horse bashed a hole in the bottom of the horizontal stabilizer. The $250.00 cost (each)of the headed jack and the tail jack is pennies compared to the cost to repair the damage if it comes off the jacks. Another point to consider is that the lack of restrictors ($2.00 each) in the proper places throughout the pneumatic system is another leading cause of jacking accidents. When the gear slams up there is a huge amount of up force, plenty to make the aircraft "hop" up just enough. When the gear comes down they seldom if ever hit the wells at exactly the same time, so you have a huge outward side load from one side then the other as they slam down to lock. I mention the prices above not in an effort to sell parts, but to demonstrate the foolishness in taking a chance without the proper equipment. I confess that back in the days before I stocked jacks I tried to do a retraction test on my 18, and ended up replacing both leading edge skins, about a $3000.00 job before it was all done. Bitter memories. Always Yakin, Doug Tim Gagnon wrote: > >Be very careful with the retraction test. It is a bit unnerving. I have done it a few times and every time it scares the hell out of me. I do not like airplanes on jacks. > > >Read this topic online here: > >http://forums.matronics.com/viewtopic.php?p=127156#127156 > > > >


    Message 8


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    Time: 09:27:40 AM PST US
    Subject: Re: Airplanes that talk to you....
    From: "Tim Gagnon" <NiftyYak50@fuse.net>
    Doug, I used all four jacks you sold to Jay Hodge. I could have put another 100 on the thing and it still would not make me ok with a retraction test on the -50. BUT, I will echo your statement with regards to the jacks. The "headed" jack is worth its weight in titanium. The tail stand is being used as we speak. Proper maintenance with the proper tool is cheap insurance. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=127183#127183


    Message 9


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    Time: 10:17:07 AM PST US
    From: "viperdoc" <viperdoc@mindspring.com>
    Subject: Red Air Fall Fling III
    Well Gang, Red Fall Fling is on again. The dates have moved due to conflicts. It will be 18-21 October 2007. Same place, Selma (KSEM). Accommodations will be the Jamison Inn (334- 874-8600). There are 30 double be rooms reserved at $69.99 for the regular and $74.99 for the premium. The block of rooms will be held until 2 weeks prior to the event. The premium means you get a microwave and refrigerator in your room. The fuel will be discounted by a price yet to be determined. 2 7 PAX vans will be awaiting the Thursday arrivals. Time to belly up to the RPA website and get signed up. A cc. email to me would be greatly apprecialted with your intentions and the # you are bringing. We need at least 2 IP's and 1 Check IP. Shane do you plan to be the keeper of the IMPAC card for the IP's rooms? The event Fee has not been determined at this very moment but expect about $125.00 so I don't pick up the difference this year and a donation can actually be made to the RPA. Email me your beverage (reasonable) and snack preferences. We will plan on a catered supper and box lunches same as the last years. For the Sat night awards dinner, plan to go back to Major Grumbles(the name and ownership changed to ???) like the previous years. See ya in October if not sooner, Doc Kemp


    Message 10


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    Time: 01:40:03 PM PST US
    From: "Jan Mevis" <jan.mevis@informavia.be>
    Subject: Airplanes that talk to you....
    Thanks all of you for your helpful advise. This list is really great !!!! I'll keep you informed about the oscillating problem of the main gear. Jan


    Message 11


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    Time: 03:19:50 PM PST US
    Subject: Re: Beware
    From: "Brad M." <bradm@gca.aero>
    To all reading this posting, I would like to remind everyone that there are always two sides to every story. As with any installation things can come up that are unexpected and unplanned, especially when dealing with such a unique aircraft as the YAK. Were there issues yes, were there delays of course, and as the manager I take full responsibility! Was the aircraft in our facility for 4 months, no! It was 3 months. Still a long time when we expected 4 weeks. Changes and customizations that had to be made to accomidate components goint places were it "looks" like it should fit. Fabrication of mount structure that do not exist, or would not work. Just as in the case of the autopilot, we were assured by the manufacturer that there were lots of installations, and come to find out that we were providing the documentation and mounting for future installs after the fact. Fabricating custom brackets, having special made parts shipped back and forth. All of which lead to delays. When the aircraft was to picked up did the main hydraulic line have a tear in it? Absolutely! Should we be held responsible for that absolutely not!. The brake line was the wrong type line, it was standard clear soft plastic static tubing, not designed for corrosive fluids. Once we found where the fluid going when the reservoir was filled, we found the hose broken at a clamp where the fluid had caused the hose to become deteriorated. It was not just a broken line due to negligence, and it was not the only line, that was bad, the entire brake system was put together with that tubing. When a mechanic was found who was willing to work on the ship, he had to replace all the lines! I could easily respond to every point, and the fact is there are always two sides, neither is ever completely right or wrong, we are the first to tell you we are not perfect. However the bottom line when Mr. Gauge left with the aircraft after the squawks he had listed were repaired, OVER ONE YEAR AGO, that was the last we had heard of any problems until now! His many letters were one we received prior to his posting. Gulf Coast Avionics would not be rated in the top 20 every year by all the manufacturers we support if we were not doing something right. We are not in the business of leaving any customer with problems. Regards, Brad Miller Service Manager Gulf Coast Avionics Corp. (863) 709-9714 ext 108 brad@gca.aero Read this topic online here: http://forums.matronics.com/viewtopic.php?p=127243#127243


    Message 12


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    Time: 08:27:20 PM PST US
    From: HodgeJW@aol.com
    Subject: brake problems
    Went flying today and when I went to put the plane back in the hanger, I couldn't. Parking brake was not set, but the wheels were locked up solid. Did some looking around and discovered I could get the brakes to release by moving the rudder back and forth. Figured the problem might be the selector valve. Pulled it out and cleaned it up. No obvious problems. Put it back in and no change. Then I noticed that when I squeeze and release the brake lever instead of a quick "phist" of air I get a slow hiss down by the reducer valve. Well hell, that must be the problem. Out comes that valve. Cleaned it up (boy was it dirty) and put it back in. Well, you guessed it, no change. What's up? Thanks, Jay http://discover.aol.com/memed/aolcom30tour




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