richard.goode(at)russiana
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 Posted: Thu Aug 07, 2008 8:46 am Post subject: Yak-52 Service Bulletins |
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Yak-52 Service Bulletins
As I have said before, it is very worrying when 52 pilots say that they "have the heavy spar" and go off and fly a 52 hard, indeed at +7G. There is no such thing as a "heavy spar".
The simple facts are:
- There are 114 Service Bulletins for the 52. Many of these are trivial, covering such items as paperwork changes.
- HOWEVER 23 of them are serious Structural Bulletins.
The principle wing modifications are:
- 59 - strengthening of the wing mounting (on the wing).
- 60 - strengthening the centre-section.
- 107 - external spar strap extending for approximately 1 meter from the inboard section of the wing, on the bottom.
- In addition 80 and 88 further modify 59.
- 107 is extremely easy to check.
- 59 and 60, also easy IF you know what you are looking for.
- What concerns me is MANY logbooks have been falsified, claiming that Service Bulletins have been embodied when they have not.
- So, if you have an early aircraft the ONLY way to be sure is to have it checked by someone who does know these SB's, and how to identify them.
- Alternatively any aircraft built after 1988 is likely to have all SB's installed with the exception of 107. Aircraft built after early 1991 should have 107 installed.
- The positive point is that the 52 is VERY strong, and no 52 has ever had catastrophic structural failure. This is despite 2,000 being built, and the majority being flown extremely hard.
- However each Service Bulletin has been devised because of structural problems being observed, and is there for a good purpose.
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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