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fishface68
Joined: 26 Apr 2016
Posts: 22
Location: uk
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 Posted: Wed Apr 27, 2016 1:02 pm Post subject: Yak52 600 hour maintenance schedule |
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Hi all does anyone out there have a 600 hour maintenance schedule for the yak 52? This is the schedule for the airframe re life at 600 hours, 3500 landings or 16 years whichever comes first.
Many thanks!
Regards Pat
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richard.goode(at)russiana
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| Posted: Thu Apr 28, 2016 12:53 am Post subject: Yak52 600 hour maintenance schedule |
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This is a somewhat complex issue, and to explain:
*In Russian DOSAAF use, the 52 was flown extremely hard; sat at one airfield
doing aerobatics all day. In consequence, and also because they were working
in a military-style environment, the 52 had a "life" of 600 hours flying. At
the end of this it would be returned to one of three major factories where
it would be completely disassembled and then built up as a new aircraft.
*In Europe we, sadly, do not have the freedoms that the "experimental"
category gives Americans to fly these sorts of aircraft. We had been using a
Russian registration of dubious legality, but some 12 years ago, the
European aviation authorities realise this and said that these registrations
were not legal and could not be used in Europe.
*In different countries the 52 is able to fly, but the simple fact is that
it is not a certificated aircraft, and therefore each country is able to
adopt its own rules and decisions as to whether they want the aircraft to
fly in their airspace. Indeed, the 52 cannot be registered in a number of
European countries.
*Fortunately, within the UK, where we had, and still have, quite a lot of
52, we have a curious part of aviation law, whereby our CAA must give
airworthiness documentation to any aircraft that is "ex-military", unless
they are particular safety reasons to refuse – for example in the case of
supersonic jet aircraft.
*Initially UK CAA said that, under this legislation, that we could continue
to fly 52 in the UK, but that it would be subject to all the original
maintenance programs, including this "total overhaul" every 600 hours. We
protested saying that, even in Russia, this regulation was considered
unnecessary and far too tough, and, certainly not needed in typical Western
use.
*This led to meetings between ourselves; Yakovlev in Moscow and the
involvement of UK CAA in which our aim was to have a more lenient, but still
totally safe maintenance regime. We had endless discussions and drafts of
documentation, but it was finally agreed that the Russian "total overhauls"
were an over-kill in Western Europe, and in its place it was agreed that we
would have a very detailed inspection every 600 hours or 15 years of flying.
*This involves the removal of the wings; engine; tail et cetera, but only by
a few feet so that x-rays can be made of all critical points and mountings.
Then there is a detailed list of other specific checks. In round terms this
will cost about £5000 ($7500) on top of a normal annual, but of course not
that frequent. Importantly, we removed from Yakovlev the "responsibility"
for the continuing airworthiness of these aircraft, which meant that we had
to get onto our team a very well reputed structural aircraft designer,
should significant structural issues emerge in the future.
*Because we had invested a lot of money and time into this project, we
thought it reasonable that the lifetime extensions should only be performed
in certain approved facilities and that we should charge a royalty for each
aircraft whose lifetime had been extended. In the UK this is controlled
through Russian engineering at White Waltham airfield.
*I emphasise that this is a procedure only for UK registered Yak 52, and it
has no significance for aircraft not registered within the UK.
I hope that helps to understand the position, but if anyone wants further
information, please contact me off list.
Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Hereford
HR5 3LW
Tel: +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com
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