---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Wed 12/20/06: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:22 AM - yak 55 and m-14 annual condition inspection (Dr Andre Katz) 2. 05:31 AM - Re: yak 55 and m-14 annual condition inspection (Stephen Fox) 3. 12:21 PM - Brake Failure in Yak (Jorgen Nielsen) ________________________________ Message 1 _____________________________________ Time: 04:22:20 AM PST US From: Dr Andre Katz Subject: Yak-List: yak 55 and m-14 annual condition inspection I am ready for an annual and been going thru the manuals and wonder if there is an english version of the items needed for inspection. the russian manual on the m-14 is rather oblique. If any member has an engine list of items please let me know. The same applies to the 55 model but i suspect that the 52 is more complex due to gear etc but i can use one as a base. happy holidays to the group and many landings next year 777YK and there indeed is nothing like a radial and nothing like a radial for aerobatics andres ________________________________ Message 2 _____________________________________ Time: 05:31:31 AM PST US From: Stephen Fox Subject: Re: Yak-List: yak 55 and m-14 annual condition inspection Dennis Savarese, I believe, has such a list. POTUS On Dec 20, 2006, at 7:21 AM, Dr Andre Katz wrote: > > > I am ready for an annual and been going thru the > manuals and wonder if there is an english version of > the items needed for inspection. the russian manual on > the m-14 is rather oblique. If any member has an > engine list of items please let me know. The same > applies to the 55 model but i suspect that the 52 is > more complex due to gear etc but i can use one as a > base. > happy holidays to the group and many landings next > year > > 777YK and there indeed is nothing like a radial and > nothing like a radial for aerobatics > andres > > ________________________________ Message 3 _____________________________________ Time: 12:21:27 PM PST US From: "Jorgen Nielsen" Subject: Yak-List: Brake Failure in Yak 2 weeks back went out in the Yak52 - air was a bit low after the start and taxi to fuel bay, then starting again, but still plenty enough based on normal operation for the taxi, t/o and retraction. During the taxi I kept an eye on the air, and just before needing to turn 90 degrees towards 29 (the taxiway heads directly for runway centre) I heard air hissing (over the noise of the engine with canopy open), glanced down and saw the air down from 25 to 15 (this in about 10 secs since my last glance), tried the brakes and there were no brakes, hence also no directional control. I thought the brake reducing valve had failed, booted left rudder to avoid the runway signs in front of me, flipped off the mags and immediately told ATC I had no brakes nor control and was heading for the rwy. There was an aircraft on short final. Went onto the grass running towards 11/29 and was busy opening the emergency air as I rolled to a stop. I could possibly have deployed the emergency air a bit sooner but thought the brakes were gone anyway (as I still had 15 bars) and had my hands were full with first trying to miss the rwy sign / comms with ATC / shutting down engine etc. It all took just a few seconds. So, no harm done other than a few go-arounds whilst I pushed the aircraft clear. The point of all this, is on subsequent investigation we found a weird failure mode: When the air is full or above 35, no leaks. As the pressure drops a leak starts and become worse as the main air pressure reduces, leading to the situation above. Air is leaking from the emergency air pop off valve in front cockpit on RHS (just in front of brake valve), which is not supposed to be in circuit with the main air anyway due to the non-return valves separating them. So the culprit appears to be a sticky/dirty non-return valve somewhere, which is kept closed when pressure is high, but then opens as the pressure drops. The pop off valve is keeping in the emergency air, but thats where the main air is blowing out from. ATC suggested I take up some extra flying or farming lessons... Any ideas, thoughts on problem? ------------------------------------------------------------------------------------- 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.