Today's Message Index:
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1. 01:00 AM - Re: Hydrostatic tests (Richard Goode)
2. 03:22 PM - CJ Landing Gear Strut pressure (dabear)
3. 07:34 PM - Re: CJ Landing Gear Strut pressure (Jeff D)
4. 07:45 PM - Re: CJ Landing Gear Strut pressure (Walter Lannon)
Message 1
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| Subject: | Hydrostatic tests |
Hi Walt,
Yes, of course all tests should be done hydrostatically. You are correct
that the Russian requirements is to test at 75 bar, but given that the
operating range is up to 55 bar, and also that many people only test every
three years, or even longer, during which time there is the opportunity for
a a lot of corrosion and also the potentially catastrophic consequences of
the bottle bursting, my purely personal view is that I want a larger safety
margin in the test. I know from Russian sources that the ultimate design
pressure is 200 bar, so my view is that, at 100 bar, there is still a lot in
hand, and I would rather that it failed at 100 than in my aircraft!
Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Hereford
HR5 3LW
Tel: +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Walter Lannon
Sent: 28 September 2013 17:38
Subject: Re: Yak-List: Hydrostatic tests
Richard;
I hope you are having that done by a qualified shop using the hydrostatic
method. At 100 Bar you are exceeding the allowable test limit if the
Russian specs. are the same as Western. That is typically 5/3 X the max
operating pressure. However this does not apply to a welded bottle.
The CJ6 bottles are welded and the max. hydro test pressure given is 75 Bar.
Less than the 83 Bar allowed for a non-welded bottle at the same operating
pressure. I assume the Russian bottles are also welded.
Walt
From: Richard Goode <mailto:richard.goode@russianaeros.com>
Sent: Saturday, September 28, 2013 1:45 AM
Subject: RE: Yak-List: Hydrostatic tests
Hi Todd,
I can tell you from experience that the real problem in both undercarriages
and the high-pressure air bottles is water, and so many Western pilots do
not methodically drain the system at least every day.
Once water starts getting into the retraction cylinders, they quickly
corrode, and while they should have an overhaul life of only six years, this
can be dramatically reduced. Equally, I can tell you that we had a yak 50
where the high-pressure bottle blew up while the aircraft was on the ground,
causing incredible damage, and certainly would have brought the aircraft
down had it been airborne! Again, totally due to water getting inside and
corroding the bottle internally.
My own leaf is to test the bottle to 100 bar (twice operating pressure)
every year!
Regards
Richard
Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Hereford
HR5 3LW
Tel: +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Todd McCutchan
Sent: 28 September 2013 00:44
Subject: Yak-List: Hydrostatic tests
How often is the hydrostatic test of the main and emergency bottles
required?
Todd McCutchan
Fast Aircraft
T-34A & Yak-50
Cell - 260.402.1740
Email: todd@fastaircraft.com
Skype: tmccutchan
Web: www.fastaircraft.com <http://www.fastaircraft.com/> &
www.toddmccutchanairshows.com <http://www.toddmccutchanairshows.com/>
http://www.matronics.com/Navigator?Yak-List
http://forums.matronics.com
http://www.matronics.com/contribution
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| Subject: | CJ Landing Gear Strut pressure |
What is the CJ6A strut pressure for the Nose and main landing gear?
Bear
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| Subject: | Re: CJ Landing Gear Strut pressure |
just did the mains =93 705 psi. Sorry have to check the book for
the nose
Jeff
From: dabear
Sent: Sunday, September 29, 2013 4:20 PM
Subject: Yak-List: CJ Landing Gear Strut pressure
What is the CJ6A strut pressure for the Nose and main landing gear?
Bear
Message 4
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| Subject: | Re: CJ Landing Gear Strut pressure |
Nose 20 +/- 1 Bar (294 +/- 14.7 psi), Mains 48 +/- 1 Bar (705 +/-
14.7).
Walt
From: dabear
Sent: Sunday, September 29, 2013 3:20 PM
Subject: Yak-List: CJ Landing Gear Strut pressure
What is the CJ6A strut pressure for the Nose and main landing gear?
Bear
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