---------------------------------------------------------- RV-List Digest Archive --- Total Messages Posted Fri 03/28/08: 8 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:57 AM - Re: New noise in NAV radio (glen matejcek) 2. 05:29 AM - Re: New noise in NAV radio (Tomasz Korwel) 3. 06:49 AM - Re: New noise in NAV radio (Tracy Crook) 4. 07:39 AM - Vans New front forks for RV6 and 7As (Charles Brame) 5. 01:56 PM - Re: Do AD's really apply? () 6. 02:37 PM - Re: Re: Do AD's really apply? (Bob J.) 7. 03:46 PM - Re: Re: Do AD's really apply? (JFLEISC@aol.com) 8. 04:15 PM - Re: New noise in NAV radio (RICHARD MILLER) ________________________________ Message 1 _____________________________________ Time: 04:57:14 AM PST US From: "glen matejcek" Subject: RV-List: RE: New noise in NAV radio Hi Ken! glen matejcek aerobubba@earthlink.net ________________________________ Message 2 _____________________________________ Time: 05:29:31 AM PST US From: Tomasz Korwel Subject: Re: RV-List: New noise in NAV radio Ken Hill wrote: > Last Sunday on a flight from Charleston to Knoxville, my KN-53 Nav > radio developed a noise/static whenever I turned up the volume. The > noise is in both the pilot and passenger headsets. It is bad enough > that I have a difficult time hearing transmissions from NAV sources > (weather, FSS, etc.) It also seems to be picking up surrounding EMF > that was not an issue previously. I borrowed another KN 53 and got > the same result. Also, it is there with the engine not running, but > other avionic units powered up. Understand this was not a problem > until recently. I checked the connections to the antenna and they > seem OK. The antenna does not appear to have any damage. If the > antenna leadwire shielding broke at the tray connector, would it > result in this kind of problem? Any suggestions would be > appreciated. > First you can try eliminating source of interferences but turning as many of your other instruments as you can, one by one checking if the noise disappears after you do it. If it won't help try to disconnect (again one by one checking results every time) any electrical gyros (if you have them). How about fuel pump? -- Tomasz ________________________________ Message 3 _____________________________________ Time: 06:49:13 AM PST US From: "Tracy Crook" Subject: Re: RV-List: New noise in NAV radio The coax shield is a possibility. If not, start unplugging the other avionics until you identify the guilty party. Tracy Crook (EE geek) On Thu, Mar 27, 2008 at 9:39 PM, Ken Hill wrote: > Last Sunday on a flight from Charleston to Knoxville, my KN-53 Nav > radio developed a noise/static whenever I turned up the volume. The noise > is in both the pilot and passenger headsets. It is bad enough that I have a > difficult time hearing transmissions from NAV sources (weather, FSS, > etc.) It also seems to be picking up surrounding EMF that was not an issue > previously. I borrowed another KN 53 and got the same result. Also, it is > there with the engine not running, but other avionic units powered up. > Understand this was not a problem until recently. I checked the connections > to the antenna and they seem OK. The antenna does not appear to have any > damage. If the antenna leadwire shielding broke at the tray connector, > would it result in this kind of problem? Any suggestions would be > appreciated. > > Ken Hill > RV-9A > Kingston, TN > > * > > * > > ________________________________ Message 4 _____________________________________ Time: 07:39:33 AM PST US From: Charles Brame Subject: RV-List: Vans New front forks for RV6 and 7As I took a different tack to modify the nose fork. I had the old fork milled out an inch deep from the bottom. The lower bronze bushing had to be removed before the milling and reinstalled afterwards. The cut was just wide enough to accommodate the compression washer and nut for the gear leg. A slot was cut in front and back to accommodate installation of the cotter pin. I then cut the leg off one inch and rethreaded. The leg now terminates inside the old fork and provides the exact same clearance as the new fork and cut off leg. The milling job did not touch the bottom welds mentioned below, so the strength of the fork was not compromised. Even better, now the nut and compression washers on the end of the leg are recessed into the fork. I think it looks better and is safer than Van's new fork. There was a photo of the mod on the Van's Air Force site, but it may have been removed. I might add that Van's does not approve of this mod, but did not state their objections. I threaded the leg myself - BIG MISTAKE! We broke one die and chewed up two more. At $50+ per die, it would have been cheaper to send the leg to Langair for the mod, and the result would have been much better and nearly as quick. There is virtually no way to rethread the leg while the leg is on the bird - too much torque involved. One needs a big vise and a very sturdy work table. We cut the leg on a band saw, and that part was quick and easy. I have a new fork for sale, if anyone is interested. Charlie Brame RV-6A, N11CB San Antonio > Time: 02:03:00 PM PST US > From: Rquinn1@aol.com > Subject: RV-List: Vans New front forks for RV6 and 7As > > I just received my new front gear leg fork from Vans to complete the > modification recommend by Vans. > The fork did not look new, in fact it appears to have been installed > before. > I phone Vans and was told by Joe that this is the result of the > contractor's jig. Has any else noticed this? > > Also I plan to make the modifications during my next annual and at > that > time > I plan to leave the gear leg in place and rethread and cut the leg as > required. Does any one have the correct thread size? > > Thanks > > Rollie & Rod > RV6A 799RQ > El Paso Int Airport > > I completed my nose gear re-work this long weekend, though I went about it the old fashioned way re-using all my parts. Here's how it went... The stock fork came off, stripped it of bolts and bushings, and I hacksawed off 1" from the bottom. This took about 1 hour of sawing by hand. I *highly* recommend a powered saw by all means. A die grinder then sliced the bottom wedges (moving aft) toward the axle. The rough cut is now done. Then came a bunch of grinding & filing & polishing to get everything parallel and airworthy. I stopped when the top and bottom bushing faces were within 0.005". The major fork work is now done. With the weld on the bottom removed, I needed to get some strength back. I was not interested in re-welding and heat-treating the fork, so I chose to add a 5/16" dia. x 5/8" long allen head "set screw" as a shear pin. This is placed just aft of the fork pivot, and 3/8" above the cut, in the meaty hunk of aluminum fork. Drill & tap, then set with locktite. I also added a couple 3/4" lightening holes near the axle, just like the new fork. This was followed by a deburr and cleanup, with a shot of paint to finish. Pound the bushings back in, replace the bolts and grease zerk, and it is ready to install. Note: the stock zerk location *just* clears the bushing when re-installed, so it did not require any modification. Now the really hard part...threading the gear leg. We did it on the plane. I used an adjustable 1.25 x 16TPH die with 18" extension handles on both sides of the die holder. It took 2 guys wrestling the die for about an hour to cut the threads. The gear leg gets so hot you can almost burn yourself! Used lots of oil and backed off 1/8 turn after every 1/2 turn cutting. It took 3 passes while necking the die down to get the nut to easily spin on. (The next day I was a sore puppy!) This die was able to get 2 gear legs cut and is now missing many teeth...pretty much trashed. I have the 2.5" die holder (w/die) for $25 shipped if you want to buy it and try it. New die is about $40. Last step is to die grind off the bottom 1" of the gear leg, clean up with a grinder, redrill the cotter pin holes, and put it all back in place. Same mounting for the wheel pants...so no changes there. Went for a test hop and my first comment is...no more nose wheel shimmy at ~18 knots...that's nice! Hope it stays that way. Maybe 8 hours of work (some of which is very hard). If I did it again...I would send the leg to the shop for cutting of the threads. The $100 saved was a pain of hard labor and I'm not 21 any more like my helper. Doing it in a vise would be a little better, but not much! The other work was just another day of building airplanes, which is much like fishing, only more productive and always satisfying. If you want an old fork - send me an email and I'll sell it for $50 shipped. It is minus one bushing that was used for a shim. Happy New Year and Blue Skies! __________________ Kelly Patterson kbob at cox dot net 190 hours RV-6A N716K PHX,AZ ________________________________ Message 5 _____________________________________ Time: 01:56:52 PM PST US From: Subject: RV-List: Re: Do AD's really apply? Just a follow up, on AD's on experimental aircraft, No, No, No, No. EXPERIMENTAL means something. We are NOT Part 23 aircraft, with type certificates or specifications. If there is a controversy take the ID off the part and put your own ID on it. If an individual DAR or FAA wants to impose their OPINION, Will or judgment fine but it is not based or supported on LEGAL FAR's pertaining to Amateur Built Aircraft. I have a Hartzell built from used parts. The blades where out of thickness tolerance at one station by 2 thousands, they were "scraped" for certified aircraft use. Perfectly fine on an experimental. (PS I called hartzell and told them the dimension and they said it was fine; they said they have to put a limit on it some where. There was plenty of margin left at current thickness. However a big nick and blending may be too much?) GA planes have TYPE CERTIFICATES and must comply or have compliance with the type specifications for everything. Experimentals HAVE no type specification of parts or installations, thus they are call experimental. Again consult EAA web site and or their legal dept. LOOK comply with all AD's that can't hurt but FIGHT the FAA and the Gov adding willy nilly requirements that are not in the FAR's. Lets not bend over and give in so easy. Support the EAA they are the only ones watching for us RV'ers and fellow homebuilt builders and owners. The AOPA will not do it. Bottom TYPE Cert Spec parts ARE NO LONGER when mounted on an experimental plane. They become de facto experimental parts since there is no TYPE CERT installation for installing that part in an experimental installation. However some argue if the engine is type cert and prop type cert it MUST comply with AD's? No as I said take the data label off the engine and put your own on it, "SKY SCOOTER 2000 EXP ENGINE". Some inspectors demand you remove the data tag off the engine, even if it meets all AD's. Inconsistent? YEP. Don't bend over. --------------------------------- Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. ________________________________ Message 6 _____________________________________ Time: 02:37:38 PM PST US From: "Bob J." Subject: Re: RV-List: Re: Do AD's really apply? On Fri, Mar 28, 2008 at 4:52 PM, wrote: > Just a follow up, on AD's on experimental aircraft, No, No, No, No. > EXPERIMENTAL means something. > > We are NOT Part 23 aircraft, with type certificates or specifications. > If there is a controversy take the ID off the part and put your own ID on > it. > If an individual DAR or FAA wants to impose their OPINION, Will or > judgment > fine but it is not based or supported on LEGAL FAR's pertaining to Amateur > Built > Aircraft. > Ok. *Cite the FAR that says AD's only apply to type certificated aircraft.* No references to EAA's site, no personal opinion, just show us where it says experimentals are exempt from AD's. Lets see how well your argument hypothetically would hold up in court. Regards, Bob Japundza RV-6 flying F1 under const. ________________________________ Message 7 _____________________________________ Time: 03:46:59 PM PST US From: JFLEISC@aol.com Subject: Re: RV-List: RE: Do AD's really apply? In a message dated 3/27/2008 8:13:01 P.M. Eastern Daylight Time, kellym@aviating.com writes: Use just a hair of common sense. If you have a Lyc IO360A1A, then you might want to note that your experimental doesn't have the referenced fuel servo, because every one with a Lycoming dataplate originally came with said servo. That is what I meant by normal.......in its certified version, not in your special, experimental that you may have persuaded the DAR had a certified engine so you could only do a 25 hour flyoff instead of 40, even though he didn't notice you had changed the servo and the mags. :-P So...If someone flys off the 40hrs (as one would with, say, an ex-automotive engine) are you saying 'ADs don't apply'? Jim **************Create a Home Theater Like the Pros. Watch the video on AOL Home. (http://home.aol.com/diy/home-improvement-eric-stromer?video=15&ncid=aolhom00030000000001) ________________________________ Message 8 _____________________________________ Time: 04:15:03 PM PST US From: RICHARD MILLER Subject: Re: RV-List: New noise in NAV radio ken is the noise steady at a perticular hertz, like a 60 cycle hum from an old stereo or does it change freqs and amplitude while flying. if it is steady then is sound like the fliter caps on a switching power supply have gone bad. if it varies it might be a bad ground or bonding strap and one part of the fuselage is charging up then discharging, This problem is normally id by a bust thru the radios. I had it so bad in a 727 that it would take out the radios for about two minuets ever half hour. it turned out to be that the contractor that had redone the fiberglass panels had not applied the antistatic paint for the bonding layer. You have said that it happens when it is on the ground engine not running, start pulling breakers for other instrument and lights. and see if it goes away. Also check the case grounds vrs the battery neg. instrument ground should not beconfused with battery neg grounds. hope that this helps. by the way sheilds are to be grounded at one end only. rick Tracy Crook wrote: The coax shield is a possibility. If not, start unplugging the other avionics until you identify the guilty party. Tracy Crook (EE geek) On Thu, Mar 27, 2008 at 9:39 PM, Ken Hill wrote: Last Sunday on a flight from Charleston to Knoxville, my KN-53 Nav radio developed a noise/static whenever I turned up the volume. The noise is in both the pilot and passenger headsets. It is bad enough that I have a difficult time hearing transmissions from NAV sources (weather, FSS, etc.) It also seems to be picking up surrounding EMF that was not an issue previously. I borrowed another KN 53 and got the same result. Also, it is there with the engine not running, but other avionic units powered up. Understand this was not a problem until recently. I checked the connections to the antenna and they seem OK. The antenna does not appear to have any damage. If the antenna leadwire shielding broke at the tray connector, would it result in this kind of problem? Any suggestions would be appreciated. Ken Hill RV-9A Kingston, TN --------------------------------- Never miss a thing. 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