richard.goode(at)russiana
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 Posted: Mon Nov 03, 2008 10:21 am Post subject: Service Bulletins - open letter to Ron Davis |
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To be blunt, I cannot understand the point that you are making, unless you are saying that AD's / SB's are not compulsory on "Experimental" aircraft - which of course I know. My points are simple:
- I have been involved with Russian aeroplanes and Yaks for twenty-three years - I expect more than most.
- I sell these aircraft, and have a real incentive that they are safe, and that people do not have problems with them.
- I have a real concern therefore when people say, in a very simplistic fashion, that their 50 or 52 has the "heavy spar". With the 52 there are three separate wing Service Bulletins, and the 50 is far more complex, with six separate significant structural modifications on the wing alone.
- The Yak-50 is an extremely tough aeroplane, but it is NOT +9 and -7G without these modifications.
- Indeed I think that anyone who flies ANY Yak-50 at much over +6G today (and that is all you need) to be imprudent.
- You ask for "one example of an AD to an Experimental aircraft" - I honestly do not know what you are looking for. However the simple fact is that there have been four fatal accidents following total structural failure on Yak-50s. Of course these were aircraft without all the modifications and being flown very hard by very competitive Soviet pilots.
- However there are sixty-seven Yak-50s still around, and I know that some of these are still being flown hard, including planes that are not fully modified. This is what I cannot understand!
- For those who would like more of the history of Yak-50 structural issues please see the following link: http://www.russianaeros.com/Yak-50%20Service%20Bulletins%20after%20crashes.htm
Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Herefordshire
HR5 3LW
United Kingdom
Tel: +44 (0) 1544 340 120
Fax: +44 (0) 1544 340 129
www.russianaeros.com
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