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Hydraulic lock...........again?

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samira.h(at)shaw.ca
Guest

Posted: Mon Dec 10, 2012 12:54 am Post subject: Hydraulic lock...........again?

It seems that the majority of this list knows by

now how to prevent a hydraulic lock on our

aircraft, right?



But what happens if one wants to purchase an used

Yak, CJ or Wilga (with very low hours) from a non Yak-

List member? How can the buyer be sure that this air-

plane hadn't had a hydraulic lock in the last/recent

few hours?



Are there any reliable inspection procedures to detect/

determine a hydraulic lock, e.g. compression test,

measuring the travel distance of each piston, any

anomalies while pulling the prop through by hand,

excessive vibrations at certain rpm, ongoing oil smoke

while warming up the engine, etc.



Thank you in advance.



cheers



Elmar

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richard.goode(at)russiana
Guest

Posted: Mon Dec 10, 2012 1:10 am Post subject: Hydraulic lock...........again?

The short answer is that there's no totally certain method of confirming

that an engine has previously been damaged through hydraulic lock, simply

because of the range of damage that can occur.



At its worst, it will be a broken connecting Rod having flailed around in

the engine causing a huge amount of damage. At its best it can be a very

slightly bent connecting rod, which, almost certainly, will fail at some

stage. However this will be sooner rather than later, and if the engine does

a subsequent 10 hours without a problem, you can be pretty sure that there

is no underlying problem!



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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samira.h(at)shaw.ca
Guest

Posted: Mon Dec 10, 2012 5:39 am Post subject: Hydraulic lock...........again?

Richard,



thank you for your expertise on this

matter, much appreciated.



I guess one still needs a certain amount

of luck when buying an used YAK, CJ or

Wilga, eh?



cheers



Elmar

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GeorgeCoy

Joined: 02 Dec 2010
Posts: 310

Posted: Mon Dec 10, 2012 6:03 am Post subject: Hydraulic lock...........again?

If you use the original Russian Top Dead Center tool and use a spacer and

properly install it, it can be used as a guide. More than 6 "tic" marks is a

probable indication of hydro lock.



To answer your other questions about Wilga, contact me off list as to flying

characteristics and reliability. (they are good but slow and require

different landing techniques). BUT the show stopper for you may be lack of

parts support for "certified" aircraft. EADS no longer supports the aircraft

and parts are very difficult to find. Simple things like brake pads for the

-80. 

George Coy



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samira.h(at)shaw.ca
Guest

Posted: Mon Dec 10, 2012 4:55 pm Post subject: Hydraulic lock...........again?

George,



thanks for the hint - excellent idea.



cheers



Elmar

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