Today's Message Index:
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1. 04:22 AM - yak 55 and m-14 annual condition inspection (Dr Andre Katz)
2. 05:31 AM - Re: yak 55 and m-14 annual condition inspection (Stephen Fox)
3. 12:21 PM - Brake Failure in Yak (Jorgen Nielsen)
Message 1
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| Subject: | yak 55 and m-14 annual condition inspection |
I am ready for an annual and been going thru the
manuals and wonder if there is an english version of
the items needed for inspection. the russian manual on
the m-14 is rather oblique. If any member has an
engine list of items please let me know. The same
applies to the 55 model but i suspect that the 52 is
more complex due to gear etc but i can use one as a
base.
happy holidays to the group and many landings next
year
777YK and there indeed is nothing like a radial and
nothing like a radial for aerobatics
andres
Message 2
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| Subject: | Re: yak 55 and m-14 annual condition inspection |
Dennis Savarese, I believe, has such a list.
POTUS
On Dec 20, 2006, at 7:21 AM, Dr Andre Katz wrote:
>
>
> I am ready for an annual and been going thru the
> manuals and wonder if there is an english version of
> the items needed for inspection. the russian manual on
> the m-14 is rather oblique. If any member has an
> engine list of items please let me know. The same
> applies to the 55 model but i suspect that the 52 is
> more complex due to gear etc but i can use one as a
> base.
> happy holidays to the group and many landings next
> year
>
> 777YK and there indeed is nothing like a radial and
> nothing like a radial for aerobatics
> andres
>
>
Message 3
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| Subject: | Brake Failure in Yak |
2 weeks back went out in the Yak52 - air was a bit low after the start and
taxi to fuel bay, then starting again, but still plenty enough based on
normal operation for the taxi, t/o and retraction. During the taxi I kept an
eye on the air, and just before needing to turn 90 degrees towards 29 (the
taxiway heads directly for runway centre) I heard air hissing (over the
noise of the engine with canopy open), glanced down and saw the air down
from 25 to 15 (this in about 10 secs since my last glance), tried the brakes
and there were no brakes, hence also no directional control. I thought the
brake reducing valve had failed, booted left rudder to avoid the runway
signs in front of me, flipped off the mags and immediately told ATC I had no
brakes nor control and was heading for the rwy. There was an aircraft on
short final. Went onto the grass running towards 11/29 and was busy opening
the emergency air as I rolled to a stop.
I could possibly have deployed the emergency air a bit sooner but thought
the brakes were gone anyway (as I still had 15 bars) and had my hands were
full with first trying to miss the rwy sign / comms with ATC / shutting down
engine etc. It all took just a few seconds.
So, no harm done other than a few go-arounds whilst I pushed the aircraft
clear. The point of all this, is on subsequent investigation we found a
weird failure mode: When the air is full or above 35, no leaks. As the
pressure drops a leak starts and become worse as the main air pressure
reduces, leading to the situation above. Air is leaking from the emergency
air pop off valve in front cockpit on RHS (just in front of brake valve),
which is not supposed to be in circuit with the main air anyway due to the
non-return valves separating them. So the culprit appears to be a
sticky/dirty non-return valve somewhere, which is kept closed when pressure
is high, but then opens as the pressure drops. The pop off valve is keeping
in the emergency air, but thats where the main air is blowing out from.
ATC suggested I take up some extra flying or farming lessons...
Any ideas, thoughts on problem?
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