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Fatal Lightning Aircraft Crash
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pennington(at)q.com
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Posted: Fri Jun 06, 2008 4:12 pm Post subject: Fatal Lightning Aircraft Crash

<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]-->  Doug

  

 I just read your response to the Arizona accident. I am very impressed with  your writing abilities and even more so with your advice. It is extremely  valid.

  

 Thank you.

  

 Gary Pennington

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14az(at)mysprocketmail.co
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Posted: Fri Jun 06, 2008 6:34 pm Post subject: Fatal Lightning Aircraft Crash

Thanks Doug, good points

  

 I agree with you. I am and will continue to inspect  my aircraft while thinking of this accident. I know  everyone is being  considerate and not talking about what Jerry did or did not do after the prop  left. That is the only thing I was really concerned about. This was a terrible  accident and has been hard on all of us, especially Greg and Crystal  Hobbs.

  

 I know some of what happened, I was at the crash  site Sunday and at Greg's with other owners when he found the prop on  Monday. The flange came off at the crank, now it is up to the NTSB to  use all it's resources to find the reason for that and report on it ASAP. I am  sure the manufacture is on top of it also. In the mean time I am doing my own  inspection of my aircraft.

  

 I have removed my flange, inspected and made a  decision as to what I will do.  My aircraft had a problem from a prop  strike so what I found might be related to the strike.  I am  replacing the  flange and bolts and installing per Jabriu instructions. I  have talked to several builders this week about the sealant they used. I was  surprised that some had used the "Red" and not the Green 620 called for in the  manual.The green is for loose threads (gaps) and high temp, which is what we  have at the flange to crank. As Doug said, It is very difficult to remove  the bolts with 620 and I think Nick has a replacement.  I know the  sealant is very important and must not be left off. I also safety wire the  bolts. I would like to use aviation close tolerance bolts with a grip on the  flange but do not know if that is necessary yet. Too many unknowns.

  

 The electronic torque tester is use to measure the  torque at removal for NDI (non destructive inspection).  Once tested the  bolts must be removed and flange reinstalled per Jabiru  instructions

  

 NTSB does not always investigate field crash  sites. A Phoenix experimental with 2 deaths last year was passed to the  FAA.

  

 We should talk about how we would react  to any emergency and what to do to make sure our aircraft are safe. All crashes  become training lessons. 

  

 I will share what I am doing to my aircraft but  please remember it will be my opinion and best judgment. I have found three  items with the flange and mounting I would like to improve on but still do not  know if it is necessary. The NTSB report will help and will be critical in  making any decisions. I do not know anything about Australian aviation hardware  provided on the engine. I must learn. I always prefer to use aviation bolts  whenever possible and will be trying to find some with a grip to match the  flange but it might have to be a special order and cost prohibited. Also, as of  now with all the 3300 engines flying I have not heard of a problem with the  hardware or the installation procedures?  Has this ever happened  before?

  

  I do not want to fix something that is not  broke but do like to make things better and safer when possible. Without  knowledge of standards used I might be lowering them with different bolts.   

  

 Brian, very good advice also.

  

 Thanks everyone,   Johnny

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pjdisher(at)bigpond.com
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Posted: Fri Jun 06, 2008 8:20 pm Post subject: Fatal Lightning Aircraft Crash

Yes, I to say thanks to Doug and Johnny for there very good points,  If I may pickup on one of Dougs points of bolt length.

 I to took off my flange and found that there was only 0.310" on bolt  protruding past the flange and into the crankshaft. Can I ask? Is this enough  for a 3/8 " dia. bolt? If my memory serves me right I though there was some rule  for penetration of a bolt of  1 & 1/2 times the diameter of the bolt. I  did replace mine with 1" bolts. It is only my option, it just didn't look like  enough bolt to me,  I just had to say something.

 Peter Disher

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ddw55(at)hotmail.com
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Posted: Sun Jun 08, 2008 1:03 pm Post subject: Fatal Lightning Aircraft Crash

Clive,

 

I've read about it. Seems to be the extension for the prop that came loose.

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Clive J

Joined: 03 Nov 2007
Posts: 340
Location: UK

Posted: Mon Jun 09, 2008 2:57 am Post subject: Fatal Lightning Aircraft Crash

Daniel, the prop hub is only a short standard one which comes with the

engine which I fitted for transportation. It's not Loctited or wire

locked.

The bolts are the ones supplied with the engine. They are like the

flywheel ones so aren't properly shouldered.

CJ



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