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Lost MP readings

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martin(at)buzzardaviation
Guest

Posted: Sun Nov 05, 2006 2:57 am Post subject: Lost MP readings

Hi gang,



My friend lost all the readings to the MP gauge in the front cockpit 

of his 52 yesterday after landing. I've agreed to go and have a look 

at it for him tomorrow and to check the back one is working. Any tips 

on what I should look for up front that may have gone wrong?



TIA



Happy Landings

    ____|____

         \O/

         o'o           Martin Robinson



Yak 18T  HA-YAV  

--

scgsmg(at)bellsouth.net
Guest

Posted: Sun Nov 05, 2006 6:09 am Post subject: Lost MP readings

Most likely it's the solder connections on the tach generator cannon plug on

the left side of the engine.  Pretty common.



Shane



--

scgsmg(at)bellsouth.net
Guest

Posted: Sun Nov 05, 2006 6:24 am Post subject: Lost MP readings

Scratch that.  That would be for the tach.  



Not awake yet this morning.



--

dsavarese(at)elmore.rr.co
Guest

Posted: Sun Nov 05, 2006 7:38 am Post subject: Lost MP readings

Hummm......lets see.  The propeller not turning will cause that problem and 

it will be extremely quiet in the cockpit (just kidding of course).  There 

is no MP gauge in the rear cockpit of the 52.  Most likely it is the 

instrument if the engine appears to be producing normal power during run up 

and take off.

Dennis



---

ben(at)designselect.net
Guest

Posted: Mon Nov 06, 2006 7:41 am Post subject: Lost MP readings

Check the engine.  Is the fan turning?



--

aihuabao(at)yahoo.com
Guest

Posted: Mon Nov 06, 2006 9:11 am Post subject: Lost MP readings

Apologies for butting in:



Where I come from the flight deck is that largish

space on top, the roof, of a boat that has many of

those small gray swoopy shape things sitting around

downstairs and upstairs. The grayish swoopy-shape

things are all outfitted with cockpits.



...... thanks for the opporunity to lurk and learn

something about your airplanes. 



 

--- flir47 <me262pilot(at)comcast.net> wrote:



 	  Quote: 	
		   

 <me262pilot(at)comcast.net>

 

 Dennis......

 

 It is no longer a "cockpit" It's a flight deck. LOL

 we must be PC? 

 

 --------

 Don’t own a Yak unless you can afford to be

 married to a maintenance schedule!

 

 

 

 

 Read this topic online here:

 



http://forums.matronics.com/viewtopic.php?p=72658#72658
	


 	  Quote: 	
		   

 

 

 

 

 

 



 Click on

 about

 provided

 www.buildersbooks.com

 Admin.



 browse

 Subscriptions page,

 FAQ,

 http://www.matronics.com/Navigator?Yak-List



 

 

 

 


	




 

Want to start your own business?

http://smallbusiness.yahoo.com/r-index

aerobaticgirl(at)yahoo.co
Guest

Posted: Mon Nov 06, 2006 9:41 am Post subject: Lost MP readings

[quote][b]

viperdoc(at)mindspring.co
Guest

Posted: Mon Nov 06, 2006 11:47 am Post subject: Lost MP readings

Shack!

Doc

 	  Quote: 	
		   [Original Message]

 From: Ai Bao <aihuabao(at)yahoo.com>

 To: <yak-list(at)matronics.com>

 Date: 11/6/2006 11:37:32 AM

 Subject: Re: Re: Lost MP readings



 

 Apologies for butting in:



 Where I come from the flight deck is that largish

 space on top, the roof, of a boat that has many of

 those small gray swoopy shape things sitting around

 downstairs and upstairs. The grayish swoopy-shape

 things are all outfitted with cockpits.



 ....... thanks for the opporunity to lurk and learn

 something about your airplanes. 



  

 --- flir47 <me262pilot(at)comcast.net> wrote:



 > 

 > <me262pilot(at)comcast.net>

 > 

 > Dennis......

 > 

 > It is no longer a "cockpit" It's a flight deck. LOL

 > we must be PC? 

 > 

 > --------

 > Don’t own a Yak unless you can afford to be

 > married to a maintenance schedule!

 > 

 > 

 > 

 > 

 > Read this topic online here:

 > 

 >

 http://forums.matronics.com/viewtopic.php?p=72658#72658

 > 

 > 

 > 

 > 

 > 

 > 

 > 

 >

 > Click on

 > about

 > provided

 > www.buildersbooks.com

 > Admin.

 >

 > browse

 > Subscriptions page,

 > FAQ,

 > http://www.matronics.com/Navigator?Yak-List

 >

 > 

 > 

 > 

 > 

  

 Want to start your own business?

 http://smallbusiness.yahoo.com/r-index

dsavarese(at)elmore.rr.co
Guest

Posted: Mon Nov 06, 2006 2:51 pm Post subject: Lost MP readings

Gee....how dumb of me.  I forgot!

Dennis



---

Rob Rowe

Joined: 10 Jan 2006
Posts: 124
Location: Berkshire, UK

Posted: Tue Nov 07, 2006 5:36 am Post subject: Re: Lost MP readings

Martin,



A simple way to ground check the manifold gauge function is to see if it correlates with the ambient altimeter pressure engine off. 



The Russian MP gauge measures in mmHg (torr) which is conveniently 3/4 (0.7500615 to be pedantic) of your (UK) altimeter millibar reading ... i.e. 1000mb equates to 750mmHg.



Easiest way to calculate this is to take 3/4 of ambient pressure variation from 1000mb and factor this against 750mmHg ... so 1020mb => 3/4 x (1020mb - 1000mb) = 15mmHg + 750mHg = 765mmHg 



The manifold gauge is only marked in 20mmHg divisions so this will not give a particularly accurate reading ... especially as its probably never been re-calibrated since manufacture.



However it should be good enough to ascertain whether the MP gauge is working or not  to help with your fault finding.



FYI ... on my 52 the MP gauge reads 10mmHg low against the altimeter reading.



Hope this helps.



Cheers, Rob

martin(at)buzzardaviation
Guest

Posted: Wed Nov 08, 2006 1:51 am Post subject: Lost MP readings

At 13:36 07/11/2006, Rob Rowe wrote:

  	  Quote: 	
		  Martin,



 A simple way to ground check the manifold gauge function is to see if it correlates with the ambient altimeter pressure engine off. 

 The Russian MP gauge measures in mmHg (torr) which is conveniently 3/4 (0.7500615 to be pedantic) of your (UK) altimeter millibar reading ... i.e. 1000mb equates to 750mmHg.

 Easiest way to calculate this is to take 3/4 of ambient pressure variation from 1000mb and factor this against 750mmHg ... so 1020mb => 3/4 x (1020mb - 1000mb) = 15mmHg + 750mHg = 765mmHg 

 The manifold gauge is only marked in 20mmHg divisions so this will not give a particularly accurate reading ... especially as its probably never been re-calibrated since manufacture.

 However it should be good enough to ascertain whether the MP gauge is working or not  to help with your fault finding.

 FYI ... on my 52 the MP gauge reads 10mmHg low against the altimeter reading.

 Hope this helps.

 Cheers, Rob 	


 Thanks for that Rob. Will check it tomorrow.



 

 Happy Landings

    ____|____

         \O/           

         o'o           Martin Robinson



 Yak 18T  HA-YAV

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