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skidmk
Joined: 19 Nov 2007
Posts: 171
Location: Ottawa, Ontario
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 Posted: Sun Aug 10, 2008 4:22 pm Post subject: Chineses Gyro questions |
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Hey guys,,, question. My AH died in the front of my CJ. The back one works fine. My question is this,, I get the impression by reading my chinese manuals that there is one gyro and the AH's are indicators? is that true? and if thats the case I would imagine that the front indicator is toast.
explainations as to how the chinese ah works?
thanks
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Mike "Skidmk" Bourget
Ottawa, Ontario |
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dougsappllc(at)gmail.com
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| Posted: Mon Aug 11, 2008 8:55 am Post subject: Chineses Gyro questions |
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The A/I's run off inverters, the front inverter powers the compass system and and the front A/I, the rear A/I is powered by a separate inverter. Your "dead" A/I may in fact be OK and you may just have a inverter that it TU. Only way to make sure is to swap the A/I's and see if it is inop when hooked up in the rear pit also. good luck.
Make sure you properly reinstall (level aircraft with ball centered) the A/I to prevent problems with dissimilar fuel feed.
On Sun, Aug 10, 2008 at 5:22 PM, skidmk <bourgem(at)cia.com (bourgem(at)cia.com)> wrote:
[quote]--> Yak-List message posted by: "skidmk" <bourgem(at)cia.com (bourgem(at)cia.com)>
Hey guys,,, question. My AH died in the front of my CJ. The back one works fine. My question is this,, I get the impression by reading my chinese manuals that there is one gyro and the AH's are indicators? is that true? and if thats the case I would imagine that the front indicator is toast.
explainations as to how the chinese ah works?
thanks
--------
Mike "Skidmk" Bourget
Ottawa, Ontario
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=197791#197791
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Always Yakin,
Doug Sapp
Phone 509-826-4610
Fax 509-826-3644
[quote][b]
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delfin_driver(at)yahoo.co
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| Posted: Mon Aug 11, 2008 9:26 am Post subject: Chineses Gyro questions |
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I noticed on a cross country flight Sunday, that the left and right fuel quantity guages do not read exaclty the same. I had one at 50 and one at 40/45. What is the cause of this and can anything be done to correct it
thanks
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dsavarese0812(at)bellsout
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| Posted: Mon Aug 11, 2008 9:46 am Post subject: Chineses Gyro questions |
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Robert,
Based on your question it sounds like you're flying a Yak 52. The Yak 52 fuel instruments very rarely read the same. Since the system is designed with a common fuel junction located below the front seat with no fuel selector, fuel burned will depend greatly upon the position of the airplane in flight. Normally Yak 52's consume fuel out of the left main tank first and pilots will see the left fuel indicator drop 10, 15 or 20 liters before the right fuel tank indication drops below 60 liters. Yak 52's require a fair amount of left rudder on take off and during the climb, which contributes to the uneven fuel burn.
Additionally, the Yak 52's vent system (assuming the model is before 1989) has a single, common vent system. Unequal venting of the fuel tanks also contributes to the disparity of fuel in the tanks.
Bottom line, what you are seeing is normal and unless you see the right tank staying a 45 - 60 liters with the left tank getting down to the 20-25 level, I wouldn't worry about it.
One thing you can do is check the slip indicator with your feet off the rudder pedals during straight and level flight. Yawing in flight, for which you compensate by rudder pressure to keep the ball centered, contributes greatly to uneven fuel burn. Adjust the rudder trim tab OFF THE AIRPLANE if you find the ball slipped left or right with your feet off the rudder pedals.
Dennis
[quote] ---
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Rob Rowe
Joined: 10 Jan 2006
Posts: 124
Location: Berkshire, UK
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| Posted: Tue Aug 12, 2008 4:35 pm Post subject: Re: Chineses Gyro questions |
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FWIW adding to Dennis's overview on fuel imbalance ... flying out of wings level has a double hit, firstly as described the high wing tank feeds fuel in preference to the low tank.
The second hit is that excess fuel from the compensation tank (yellow sphere on firewall that feeds the pressure carb) is returned to the collector tank under the seat, which in turn can overflow back to the wing tanks via a simple T connection ... so excess fuel (determined by pump pressure over carb consumption / throttle setting) will ultimately tend to flow back to the low wing tank.
So you end up feeding from the high tank & returning excess to the low one ... quickly getting the tanks out of balance. And as quickly remedied by raising the fuller tank wing by 5 degrees offset by opposite rudder, as per the Russian pilot notes.
Briefly worth mentioning other less common sources of imbalance that I've come across in wings level flight ...
If one of the vent tubes gets blocked or angled differently into the airflow (on 1989+ models) this can cause a tank pressure imbalance with fuel return favoured to the low pressure one & fed from the higher pressure one.
[Presume the Russians changed the design to two separate tank vents to stop the syphoning problem with the single vent in hot weather with full tanks ... fixing one problem to potentially create another]
Similarly over-tightening the wing filler caps in time can stretch the rubber seal leaving the tank open to the upper wing surface (low) pressure, with results as per the vents above. If suspected this can be simply checked by swapping the filler cap around to see if the imbalance follows it.
I've also heard that the wing tank feed non-return (flap) valves can stick over time due to residue build up (I think), which may also contribute to tank imbalance.
Hope this helps.
brgds, Rob R
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