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cjpilot710(at)aol.com
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 Posted: Thu Oct 11, 2012 5:00 pm Post subject: AD notes for Yaks & CJs |
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I know a goodly number of those on the Yak-list are not RPA members, and thus most likely didn't get the email alert about two incidences involving a Yak and a CJ.
I've copied the text only. I think its a good idea to share this info right away.
Recently, an Australian Yak-52TW was in a descent at 240 MPH.
The aircraft had a sudden onset of an audible drone rapidly followed by a loud bang. The aircraft then vibrated violently. The trim tab broke into 4 parts. Only one of the parts remained on the elevator. The trim tab push rod also broke at the attachment point.
Notice the cracked elevator skin above the torque tube.
In addition to the trim tab and left elevator, the engine rubber mounts were also broken.
A complete analysis of this incident is still pending. However, the RPA is asking all TW owners specifically and all 52 owners in general to routinely preflight all trim system components for wear and excessive play.
The elapsed time between the onset of the drone noise and the vibration was 1-2 seconds.
The pilot was able to slow the aircraft down and land without incident.
The aircraft was new in 2004 and only has 245 hours total time. the aircraft is used for aerobatics less than 5% of the time and has been well maintained.
The trim tab broke into 4 parts. Only one of the parts remained on the elevator. The trim tab push rod also broke at the attachment point.
Notice the cracked elevator skin above the torque tube.
In addition to the trim tab and left elevator, the engine rubber mounts were also broken.
A complete analysis of this incident is still pending. However, the RPA is asking all TW owners specifically and all 52 owners in general to routinely preflight all trim system components for wear and excessive play.
________________________________________________________________________________
Bill Blackwell notified Scott Andrews today of a cracked rudder counterbalance weight tube he found while performing a conditional inspection.
Scott informed as many of the Phoenix area CJ owners as he could to inspect their aircraft.
They found one aircraft with a welded patch on the counterbalance arm that was probably done in China.
This picture shows the location of the crack.
It is below the rudder bell crank and just above the 90 degree support bracket.
This picture shows the repair Bill made to the tube. It does not show the crack he found.
[quote][b]
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Dale
Joined: 30 May 2007
Posts: 178
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| Posted: Thu Oct 11, 2012 7:49 pm Post subject: Re: AD notes for Yaks & CJs |
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Only 240 mph? Why the slow down.
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wlannon(at)shaw.ca
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| Posted: Thu Oct 11, 2012 7:49 pm Post subject: AD notes for Yaks & CJs |
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Pappy;
Could you post the photos? Very interested in the CJ balance arm crack.
Many thanks;
Walt
From: cjpilot710(at)aol.com (cjpilot710(at)aol.com)
Sent: Thursday, October 11, 2012 5:57 PM
To: yak-list(at)matronics.com (yak-list(at)matronics.com)
Subject: AD notes for Yaks & CJs
I know a goodly number of those on the Yak-list are not RPA members, and thus most likely didn't get the email alert about two incidences involving a Yak and a CJ.
I've copied the text only. I think its a good idea to share this info right away.
Recently, an Australian Yak-52TW was in a descent at 240 MPH.
The aircraft had a sudden onset of an audible drone rapidly followed by a loud bang. The aircraft then vibrated violently. The trim tab broke into 4 parts. Only one of the parts remained on the elevator. The trim tab push rod also broke at the attachment point.
Notice the cracked elevator skin above the torque tube.
In addition to the trim tab and left elevator, the engine rubber mounts were also broken.
A complete analysis of this incident is still pending. However, the RPA is asking all TW owners specifically and all 52 owners in general to routinely preflight all trim system components for wear and excessive play.
The elapsed time between the onset of the drone noise and the vibration was 1-2 seconds.
The pilot was able to slow the aircraft down and land without incident.
The aircraft was new in 2004 and only has 245 hours total time. the aircraft is used for aerobatics less than 5% of the time and has been well maintained.
The trim tab broke into 4 parts. Only one of the parts remained on the elevator. The trim tab push rod also broke at the attachment point.
Notice the cracked elevator skin above the torque tube.
In addition to the trim tab and left elevator, the engine rubber mounts were also broken.
A complete analysis of this incident is still pending. However, the RPA is asking all TW owners specifically and all 52 owners in general to routinely preflight all trim system components for wear and excessive play.
________________________________________________________________________________
Bill Blackwell notified Scott Andrews today of a cracked rudder counterbalance weight tube he found while performing a conditional inspection.
Scott informed as many of the Phoenix area CJ owners as he could to inspect their aircraft.
They found one aircraft with a welded patch on the counterbalance arm that was probably done in China.
This picture shows the location of the crack.
It is below the rudder bell crank and just above the 90 degree support bracket.
This picture shows the repair Bill made to the tube. It does not show the crack he found.
[quote]
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
[b]
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tjyak50
Joined: 31 May 2007
Posts: 81
Location: Phoenix, AZ
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| Posted: Fri Oct 12, 2012 6:19 am Post subject: Re: AD notes for Yaks & CJs |
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Pappy said 240 Mph but did you mean 240 KMph?
240mph is nearly 400 kilometers per hour and (aside from being nearly impossible) is just too fast in a Yak 52.
Tj
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viperdoc(at)mindspring.co
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| Posted: Fri Oct 12, 2012 8:01 am Post subject: AD notes for Yaks & CJs |
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Just trying to hit VNE
Doc
Sent from my iPad
On Oct 12, 2012, at 9:19 AM, "tjyak50" <tomjohnson(at)cox.net> wrote:
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tjyak50
Joined: 31 May 2007
Posts: 81
Location: Phoenix, AZ
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| Posted: Fri Oct 12, 2012 8:28 am Post subject: Re: AD notes for Yaks & CJs |
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Assuming Pappy listed wrong units or else that pilot was doing 10% over VNE and you are working hard to make a Yak 52TW do that, and parts departing would be the expected result.
Had a little too much of airplanes going over VNE and losing trim tabs in the last few years... It happened again to another airplane at Reno this year.
Pappy's point remains, check the trim tabs carefully, they prone to getting smacked back there.
Tj
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Dale
Joined: 30 May 2007
Posts: 178
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| Posted: Fri Oct 12, 2012 8:52 am Post subject: Re: AD notes for Yaks & CJs |
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The TW 'S Airspeed indocators in the US are in MPH and KTS.
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tjyak50
Joined: 31 May 2007
Posts: 81
Location: Phoenix, AZ
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| Posted: Fri Oct 12, 2012 9:12 am Post subject: Re: AD notes for Yaks & CJs |
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The range markings on all the Westernized Yaks are dubious.
Compare the oil temp limits in the W to the "book" and they are way off in the ones I flew. Same with ASI
That ASI says your VNE is 450KmPH which is nearly 100KmPH more than the VNE for a Yak 52.
Note the correct Yak VNE is 223mph which corresponds to the beginning of that ASI Yellow Arc.
Yak 52 Tech Description says 360
Yak 52TW Tech Description says 360
Yak 52TW Flight Manual says 420
That installed Airspeed says 450
Beware translations in Yaks
YMMV..
Tj
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| Yak 52 Flight manual says 420 |
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| Yak 52TW Technical Desc shows 360 |
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| Yak 52 Technical Description shows 360VNE |
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Dale
Joined: 30 May 2007
Posts: 178
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| Posted: Fri Oct 12, 2012 11:12 am Post subject: Re: AD notes for Yaks & CJs |
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Why anyone would be near these speed are beyond me.
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viperdoc(at)mindspring.co
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| Posted: Fri Oct 12, 2012 12:14 pm Post subject: AD notes for Yaks & CJs |
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I don't know...480 was always comfortable for me. ;^)) knots that is.
Doc
Sent from my iPad
On Oct 12, 2012, at 2:12 PM, "Dale" <dale(at)frii.com> wrote:
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markdavis(at)wbsnet.org
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| Posted: Fri Oct 12, 2012 1:34 pm Post subject: AD notes for Yaks & CJs |
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My YAK-52 doesn't like much above 360-370 kph. Kind of like a T-28 being
pushed above 300 kts. Redline was 340 as I recall. Joining the 300 Knot
Club was where I first heard the saying "Shakin' like a dog shittin' peach
seeds". Just because the gauge says you "can", doesn't necessarily mean you
"should" go there. (Excluding of course jobs for the young and fearless
where taxpayers pay for airplanes with armed ejection seats!)
Mark Davis
N44YK
---
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