Today's Message Index:
----------------------
1. 06:06 AM - Re: cj-6 water filter (Craig Winkelmann, CFI)
2. 07:15 AM - Hello Yakers, (AlfonzLiska)
3. 09:42 AM - Yak-52 heavy spar (Richard Goode)
4. 02:34 PM - CJ6 4mm Nut plates (Kinker, JC (AZ76))
5. 05:04 PM - Re: Yak-52 heavy spar (Roger Baker)
Message 1
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| Subject: | Re: cj-6 water filter |
Keith:
If it is significantly corroded, just get a replacement from Doug Sapp (you'll
get to know him well owning a CJ). He has one that is larger (holds more desiccant)
and is made of stainless steel (no corrosion). It is a good investment
in maintaining your air system.
Craig
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 1406#201406
Message 2
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Hi guys, My name is Alfonz and I'm new man in WLAC -White Waltham russian eng.
after Rob Kent has left.
If anyone need some advice regarding parts, I would be more than happy to help.
All the best to everybody.
Alfonz
8)
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 1421#201421
Attachments:
http://forums.matronics.com//files/dsc_7161_793.jpg
Message 3
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| Subject: | Yak-52 heavy spar |
I see there is another enquiry about how to identify the heavy spar on
the
Yak-52.
It is a great pity that this simplistic notion still continues.
To confirm:
Yak-52 is a very tough aeroplane but when it began being flown hard, a
number of structural problems emerged. As they emerged, Yakovlev
instituted
a series of mandatory Service Bulletins to allow the aeroplane to
continue
to fly at the same G limits.
Unfortunately, many aeroplanes have not been modified; some logbooks
have
been falsified etc.
There are actually 114 Service Bulletins, of which many are trivial.
Our view is that there are 31 serious structural Bulletins, which really
should be installed on any 52s doing aerobatics at more than (say) 4G.
The list of these important Bulletins is as follows:
9 48 71
18 53 72
28 54 75
34 59 80
36 60 82
37 62 92
38 66 93
41 67 99
45 69 100
47 70 106
107
The critical wing Bulletins are:
59 for stronger wing mountings
60 for stronger centre section
107 ' external (underneath) spar-strap
59 and 60 came out together in 1987 and 107 in 1991
So the practicality is that an aeroplane built after the middle of 1991
SHOULD have all SBs incorporated.
Also, any aeroplanes incorporating 107 are almost certainly
incorporating
all earlier Bulletins.
107 can be identified by being a metal plate, about 4=92 long, bolted
under
the wing to the main spar, but proud of the under-wing surface.
Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Hereford
HR5 3LW
United Kingdom
Tel: +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com
Message 4
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| Subject: | CJ6 4mm Nut plates |
I wish to buy (150) of the standard CJ6 4mm Nut plates, don't ask why?
Also, I have a need for the CJ6 metric version of the DZUS fasteners
(studs, collars & "S" springs).
Any known sources for the above hardware? Unfortunately, Doug Sapp is
temporarily out of stock.
Check 6, JC
Message 5
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| Subject: | Re: Yak-52 heavy spar |
Richard,
Nice of you to chime in on this matter, but you did not answer
the mans question. I don't think I quite follow you when you say "It
is a great pity that this simplistic notion still continues". To
what "simplistic notion" were your referring?
I would be interested in knowing what the "number of structural
problems" that emerged actually were. Does anyone (such as yourself)
have a verified list of the actual structual problems that are
supposed to have been occuring on Yak 52's? If so, is there any
independant verification that these problems were truly occuring in
the real world.
I do know the trail that led to Bulletin #107 and from that, I
believe that bulletin 107 is nonsense....written in an attempt to
raise some money at the bureau in those dark days of the early to mid
90's when they had no funding from anybody. If you know different, I
would appreciate hearing about it.
So far as I know, NO Yak 52, with or without the wing attach
and spar carry through modifications mandated by 59 and 60, has
crashed due to structural failure.
Roger Baker
On Aug 29, 2008, at 9:41 AM, Richard Goode wrote:
>
> I see there is another enquiry about how to identify the heavy spar
> on the Yak-52.
> It is a great pity that this simplistic notion still continues.
>
> To confirm:
>
> Yak-52 is a very tough aeroplane but when it began being flown
> hard, a number of structural problems emerged. As they emerged,
> Yakovlev instituted a series of mandatory Service Bulletins to
> allow the aeroplane to continue to fly at the same G limits.
>
> Unfortunately, many aeroplanes have not been modified; some
> logbooks have been falsified etc.
> There are actually 114 Service Bulletins, of which many are trivial.
> Our view is that there are 31 serious structural Bulletins, which
> really should be installed on any 52s doing aerobatics at more than
> (say) 4G.
>
> The list of these important Bulletins is as follows:
>
>
> 9 48 71
> 18 53 72
> 28 54 75
> 34 59 80
> 36 60 82
> 37 62 92
> 38 66 93
> 41 67 99
> 45 69 100
> 47 70 106
> 107
>
> The critical wing Bulletins are:
>
> 59 for stronger wing mountings
> 60 for stronger centre section
> 107 ' external (underneath) spar-strap
>
> 59 and 60 came out together in 1987 and 107 in 1991
> So the practicality is that an aeroplane built after the middle of
> 1991 SHOULD have all SBs incorporated.
>
> Also, any aeroplanes incorporating 107 are almost certainly
> incorporating all earlier Bulletins.
>
> 107 can be identified by being a metal plate, about 4=92 long, bolted
> under the wing to the main spar, but proud of the under-wing surface.
>
>
> Richard Goode Aerobatics
> Rhodds Farm
> Lyonshall
> Hereford
> HR5 3LW
> United Kingdom
>
> Tel: +44 (0) 1544 340120
> Fax: +44 (0) 1544 340129
> www.russianaeros.com
>
>
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