ZS-TRR

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HJK 414
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Re: ZS-TRR

Unread post by HJK 414 » Tue Aug 13, 2019 7:24 pm

Ray W wrote:
Tue Aug 13, 2019 6:54 pm
Yes but I can't remember what he calls himself :oops:

Thx Ray

Sardyn - found him.

JK
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Avgas
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Re: ZS-TRR

Unread post by Avgas » Wed Aug 14, 2019 6:16 pm

One undercarriage leg gave in on the roll out after a test flight. Over center lock bolt sheared or something.
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Re: ZS-TRR

Unread post by HJK 414 » Wed Aug 14, 2019 9:18 pm

Avgas wrote:
Wed Aug 14, 2019 6:16 pm
One undercarriage leg gave in on the roll out after a test flight. Over center lock bolt sheared or something.

Yes,

The common disease with the earlier 400 series.
It was sorted in the later series with the trailing link UC's...….
If a hard landing is made - a lot of the stress on the undercarriage is absorbed by the over-centre locking bar - and the fixation bolt will crack.
It will stay in the bushing - and sooner or later the bolt will come apart and the under-cart will collapse.
Often when the aircraft is making a slow left or right hand turn / vacating a runway or taxiway.

A Maintenance organisation that has any experience with the 400 series - will change the bolts at least every 100 hours / annual or after a reported hard landing. If this aircraft had undergone major maintenance (hence the testflight) and the subsequent landing was "normal" (no hard landing) - I would have taken legal action against the AMO for negligence.

JK
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