KIS-List Digest Archive

Wed 11/26/14


Total Messages Posted: 5



Today's Message Index:
----------------------
 
     0. 08:03 AM - Giving Thanks - Your List Contribution... (Matt Dralle)
     1. 06:38 AM - TR-1 Incident down under (mark_trickel)
     2. 08:03 AM - Re: TR-1 Incident down under (Owen Baker)
     3. 08:10 AM - Re: TR-1 Incident down under (Keith.Miller@esa.int)
     4. 09:04 AM - Re: TR-1 Incident down under (Galin Hernandez)
 
 
 


Message 0


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    Time: 08:03:15 AM PST US
    From: Matt Dralle <dralle@matronics.com>
    Subject: Giving Thanks - Your List Contribution...
    Dear Listers, Here in the United States, Thursday is our National day of Thanksgiving. Many of us will be traveling to be with our families and friends to share in generous feasts of plenty and giving thanks for the many blessings that have been bestowed upon us. Many Listers have expressed over the last couple of weeks how thankful they are for the Email Lists and Forums here on the Matronics servers and for all of the assistance and comradery they have experienced being a part of the Lists. One of my favorite comments is when someone writes to me and says something like, "Its the first thing I do in the morning while I'm having my morning coffee!". That's a wonderful tribute to the purpose and function of these Lists. Its always great to hear I'm not the only one that jumps out of bed each morning to check my List email!! Won't you take a minute today and show your appreciation for these Lists and for their continued operation and upgrade? The List Contribution Site is: http://www.matronics.com/contribution Or, drop a personal check in the mail to: Matt Dralle / Matronics 581 Jeannie Way Livermore CA 94550 USA Thank you in advance for your kind consideration, Matt Dralle Matronics Email List Administrator


    Message 1


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    Time: 06:38:44 AM PST US
    Subject: TR-1 Incident down under
    From: "mark_trickel" <marktrickel@gmail.com>
    KIS Incident Down Under With regret, I post this news from Australia - Michael Pattens TR-1 main gear collapsed during roll out after touchdown when one of the attach bolts let lose: Airframe event involving a Amateur Built Aircraft KIS TR-1, VH-AIG, Taree, Aerodrome, NSW on 9 September 1996. Following an uneventful flight, the pilot reported that the aircraft touched down normally. After rolling about 80 m the right wing dropped and the pilot suspected a tire had failed. But about 50 m further on he heard pronounced scraping noises and the aircraft slewed right then left before finally coming to a halt about 10 m to the left of the runway. A subsequent inspection of the aircraft revealed that the fixed landing gear attachment bolts had failed at the countersunk heads. The failure faces contained rust deposits, indicating the bolts had been cracked for some time prior to the accident. The manufacturer has subsequently changed the design specification to fit standard flat head bolts in place of countersunk bolts. The complete report is located here: http://www.atsb.gov.au/publications/investigation_reports/1996/aair/199602857.aspx I ran out to my hanger/shed, and checked mine (my TR-1C is a very early kit #23), it has the round Allen head bolts which are recessed into the attach bracket I will be checking them for any signs of corrosion or cracking, and I recommend you check yours too. Can anybody confirm that there was a change to a counter sunk flat head bolt??? Galin while you are down for repairs you may want to consider replacing these main gear bolts. Mark T. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=434702#434702


    Message 2


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    Time: 08:03:48 AM PST US
    From: "Owen Baker " <bakerocb@cox.net>
    Subject: Re: TR-1 Incident down under
    11/26/2014 Hello Mark, I am sorry to hear of the KIS Incident Down Under. You wrote: "Can anybody confirm that there was a change to a counter sunk flat head bolt???" Here is my perception / recollection of the landing gear retention bracket situation: 1) The one piece aluminum main landing gear on the tricycle gear KIS TR-1 had a rectangular cross section and the center portion of the gear was fastened into a recess in the bottom of the composite fuselage. 2) The gear was held up into place in the composite recess by two metal brackets each of which had two bolts, one bolt forward of the cross section and one bolt aft of the cross section. 3) The earlier kit's brackets were an aluminum bar and were notched on the upper side to fit the rectangular cross section of the landing gear. These aluminum brackets were also counter sunk or recessed around the bolt holes in the bottom surface of the brackets so that either the head or threaded end of the bolt (depending upon direction of bolt insertion) did not have to project out into the air flow. 4) By the time my kit (#116) was made, the notched and recessed aluminum brackets were no longer being provided. Instead two pieces of flat, undrilled steel bar stock about 6 inches long, 1 inch wide, and 3/8 inch thick were provided as landing gear retention brackets. (Don't hold me to those exact dimensions -- I am not at the hangar and unable to measure.) 5) Since the flat steel bar stock was neither notched nor drilled the builder had to drill holes in the bar stock such that the sides of the bolts would keep the gear center cross section from shifting fore and aft. 6) Normal steel AN bolts were provided to hold the steel brackets in place and either the head or threaded end of the bolt (depending upon direction of insertion) was left to stick out into the airflow past the bottom surface of the steel bracket. Any questions? OC ================================================================= From: mark_trickel Sent: Wednesday, November 26, 2014 9:38 AM Subject: KIS-List: TR-1 Incident down under KIS Incident Down Under With regret, I post this news from Australia - Michael Pattens TR-1 main gear collapsed during roll out after touchdown when one of the attach bolts let lose: Airframe event involving a Amateur Built Aircraft KIS TR-1, VH-AIG, Taree, Aerodrome, NSW on 9 September 1996. Following an uneventful flight, the pilot reported that the aircraft touched down normally. After rolling about 80 m the right wing dropped and the pilot suspected a tire had failed. But about 50 m further on he heard pronounced scraping noises and the aircraft slewed right then left before finally coming to a halt about 10 m to the left of the runway. A subsequent inspection of the aircraft revealed that the fixed landing gear attachment bolts had failed at the countersunk heads. The failure faces contained rust deposits, indicating the bolts had been cracked for some time prior to the accident. The manufacturer has subsequently changed the design specification to fit standard flat head bolts in place of countersunk bolts. The complete report is located here: http://www.atsb.gov.au/publications/investigation_reports/1996/aair/199602857.aspx I ran out to my hanger/shed, and checked mine (my TR-1C is a very early kit #23), it has the round Allen head bolts which are recessed into the attach bracket I will be checking them for any signs of corrosion or cracking, and I recommend you check yours too. Can anybody confirm that there was a change to a counter sunk flat head bolt??? Galin while you are down for repairs you may want to consider replacing these main gear bolts. Mark T. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=434702#434702


    Message 3


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    Time: 08:10:01 AM PST US
    Subject: Re: TR-1 Incident down under
    From: Keith.Miller@esa.int
    when did "The manufacturer has subsequently changed the design specification to fit standard flat head bolts in place of countersunk bolts."take place . i still have the countersunk bolts !!!!. From: "mark_trickel" <marktrickel@gmail.com> To: kis-list@matronics.com, Date: 11/26/2014 03:40 PM Subject: KIS-List: TR-1 Incident down under Sent by: owner-kis-list-server@matronics.com KIS Incident Down Under With regret, I post this news from Australia - Michael Pattens TR-1 main gear collapsed during roll out after touchdown when one of the attach bolts let lose: Airframe event involving a Amateur Built Aircraft KIS TR-1, VH-AIG, Taree, Aerodrome, NSW on 9 September 1996. Following an uneventful flight, the pilot reported that the aircraft touched down normally. After rolling about 80 m the right wing dropped and the pilot suspected a tire had failed. But about 50 m further on he heard pronounced scraping noises and the aircraft slewed right then left before finally coming to a halt about 10 m to the left of the runway. A subsequent inspection of the aircraft revealed that the fixed landing gear attachment bolts had failed at the countersunk heads. The failure faces contained rust deposits, indicating the bolts had been cracked for some time prior to the accident. The manufacturer has subsequently changed the design specification to fit standard flat head bolts in place of countersunk bolts. The complete report is located here: http://www.atsb.gov.au/publications/investigation_reports/1996/aair/199602857.aspx I ran out to my hanger/shed, and checked mine (my TR-1C is a very early kit #23), it has the round Allen head bolts which are recessed into the attach bracket I will be checking them for any signs of corrosion or cracking, and I recommend you check yours too. Can anybody confirm that there was a change to a counter sunk flat head bolt??? Galin while you are down for repairs you may want to consider replacing these main gear bolts. Mark T. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=434702#434702 This message and any attachments are intended for the use of the addressee or addressees only. The unauthorised disclosure, use, dissemination or copying (either in whole or in part) of its content is not permitted. If you received this message in error, please notify the sender and delete it from your system. Emails can be altered and their integrity cannot be guaranteed by the sender. Please consider the environment before printing this email.


    Message 4


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    Time: 09:04:03 AM PST US
    From: Galin Hernandez <galinhdz@gmail.com>
    Subject: Re: TR-1 Incident down under
    Last year (2013) I actually replaced these bolts and the rubber "gaskets" they had even though they looked good with no sign of fatigue. On Wed, Nov 26, 2014 at 9:38 AM, mark_trickel <marktrickel@gmail.com> wrote : > > KIS Incident Down Under > > With regret, I post this news from Australia - Michael Patten=99s T R-1 main > gear collapsed during roll out after touchdown when one of the attach bol ts > let lose: > > Airframe event involving a Amateur Built Aircraft KIS TR-1, VH-AIG, Taree , > Aerodrome, NSW on 9 September 1996. > Following an uneventful flight, the pilot reported that the aircraft > touched down normally. After rolling about 80 m the right wing dropped an d > the pilot suspected a tire had failed. But about 50 m further on he heard > pronounced scraping noises and the aircraft slewed right then left before > finally coming to a halt about 10 m to the left of the runway. A subseque nt > inspection of the aircraft revealed that the fixed landing gear attachmen t > bolts had failed at the countersunk heads. The failure faces contained ru st > deposits, indicating the bolts had been cracked for some time prior to th e > accident. The manufacturer has subsequently changed the design > specification to fit standard flat head bolts in place of countersunk bol ts. > > The complete report is located here: > > http://www.atsb.gov.au/publications/investigation_reports/1996/aair/19960 2857.aspx > > I ran out to my hanger/shed, and checked mine (my TR-1C is a very early > kit #23), it has the round Allen head bolts which are recessed into the > attach bracket =93 I will be checking them for any signs of corrosi on or > cracking, and I recommend you check yours too. Can anybody confirm that > there was a change to a counter sunk flat head bolt??? Galin =93 w hile you > are down for repairs you may want to consider replacing these main gear > bolts. > > Mark T. > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=434702#434702 > > =========== =========== =========== =========== > >




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