Today's Message Index:
----------------------
1. 03:09 AM - Re: Gear not locking up (Lancer)
2. 04:47 AM - Re: Re: Gear not locking up (A. Dennis Savarese)
3. 06:50 AM - Re: Re: Gear not locking up (Bill Geipel)
4. 07:04 AM - Re: Re: Gear not locking up (A. Dennis Savarese)
5. 09:56 AM - Re: Accident Report Yak-52 forced landing due engine failure. (Bitterlich, Mark G CIV NAVAIR, WD)
6. 09:32 PM - Pulling Yak Wings (AndieVintageAir)
Message 1
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| Subject: | Re: Gear not locking up |
Is the Emergency air valve securely closed?
--------
You can run but you can't hide
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=474963#474963
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| Subject: | Re: Gear not locking up |
CJ6 or Yak 52?
When was the last time you overhauled the uplock actuators themselves?
If the emergency air valve was leaking, it could cause the gear not to retr
act at all since the emergency air would be forcing the shuttle valve or di
verter valve to block the main side, keeping pressure on the down side of t
he actuator, thus preventing the gear from retracting.
If the main system is keeping the uplock pin out, when you place the gear s
elector in neutral, it is suppose to depressurize the uplock actuator allow
ing the pin to retract.=C2- On the 52, the uplock actuator has two lines
connected to it.=C2- The one in the middle of the actuator is the main sy
stem and the one to the rear is the emergency side.=C2- On the CJ, you ha
ve two diverter valves connected to a single port on the uplock actuator.
=C2- One diverter valve for the main and one for the emergency.
With the main air turned off and the gear selectors in neutral front and re
ar and the uplock pin out, try removing the air lines one at a time from on
e the uplock actuators or diverter valves to see which side, main or emerge
ncy, is keeping pressure on the uplock actuator, forcing the pin to stay ou
t.=C2-=C2- If you find there is no pressure on the actuator or diverter
valve and the pin remains out, pull the uplock actuator, disassemble, clea
n and overhaul it because the spring inside the uplock actuator is not able
to retract the pin when no pressure is on the uplock actuator.Dennis
From: Lancer <lrob4783@bigpond.net.au>
To: yak-list@matronics.com
Sent: Tuesday, November 14, 2017 6:10 AM
Subject: Yak-List: Re: Gear not locking up
Is the Emergency air valve securely closed?
--------
You can run but you can't hide
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=474963#474963
S -
WIKI -
-
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
Message 3
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| Subject: | Re: Gear not locking up |
What=99s your air pressure when retracting? I just went thru this? Wil
l negative Gs lock them up?
> On Nov 14, 2017, at 21:45, A. Dennis Savarese <dsavarese0812@bellsouth.net
> wrote:
>
> CJ6 or Yak 52?
>
> When was the last time you overhauled the uplock actuators themselves?
>
> If the emergency air valve was leaking, it could cause the gear not to ret
ract at all since the emergency air would be forcing the shuttle valve or di
verter valve to block the main side, keeping pressure on the down side of th
e actuator, thus preventing the gear from retracting.
>
> If the main system is keeping the uplock pin out, when you place the gear s
elector in neutral, it is suppose to depressurize the uplock actuator allowi
ng the pin to retract. On the 52, the uplock actuator has two lines connect
ed to it. The one in the middle of the actuator is the main system and the o
ne to the rear is the emergency side. On the CJ, you have two diverter valv
es connected to a single port on the uplock actuator. One diverter valve fo
r the main and one for the emergency.
>
> With the main air turned off and the gear selectors in neutral front and r
ear and the uplock pin out, try removing the air lines one at a time from on
e the uplock actuators or diverter valves to see which side, main or emergen
cy, is keeping pressure on the uplock actuator, forcing the pin to stay out.
If you find there is no pressure on the actuator or diverter valve and th
e pin remains out, pull the uplock actuator, disassemble, clean and overhaul
it because the spring inside the uplock actuator is not able to retract the
pin when no pressure is on the uplock actuator.
> Dennis
>
>
> From: Lancer <lrob4783@bigpond.net.au>
> To: yak-list@matronics.com
> Sent: Tuesday, November 14, 2017 6:10 AM
> Subject: Yak-List: Re: Gear not locking up
>
>
> Is the Emergency air valve securely closed?
>
> --------
> You can run but you can't hide
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=474963#474963
>
>
>
>
>
>
> -= --> http://www.matronics.com/Navigator?Yak-List
> great content also available via the Web Forums!
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| Subject: | Re: Gear not locking up |
I'm pretty certain he said the uplock pins won't retract.=C2- With the pi
ns out, the parrot hooks will not lock in position, which are a mechanical
locking mechanismDennis.
From: Bill Geipel <l129bs@gmail.com>
To: yak-list@matronics.com
Sent: Tuesday, November 14, 2017 9:53 AM
Subject: Re: Yak-List: Re: Gear not locking up
What=99s your air pressure when retracting? I just went thru this? Wi
ll negative Gs lock them up?
On Nov 14, 2017, at 21:45, A. Dennis Savarese <dsavarese0812@bellsouth.net>
wrote:
CJ6 or Yak 52?
When was the last time you overhauled the uplock actuators themselves?
If the emergency air valve was leaking, it could cause the gear not to retr
act at all since the emergency air would be forcing the shuttle valve or di
verter valve to block the main side, keeping pressure on the down side of t
he actuator, thus preventing the gear from retracting.
If the main system is keeping the uplock pin out, when you place the gear s
elector in neutral, it is suppose to depressurize the uplock actuator allow
ing the pin to retract.=C2- On the 52, the uplock actuator has two lines
connected to it.=C2- The one in the middle of the actuator is the main sy
stem and the one to the rear is the emergency side.=C2- On the CJ, you ha
ve two diverter valves connected to a single port on the uplock actuator.
=C2- One diverter valve for the main and one for the emergency.
With the main air turned off and the gear selectors in neutral front and re
ar and the uplock pin out, try removing the air lines one at a time from on
e the uplock actuators or diverter valves to see which side, main or emerge
ncy, is keeping pressure on the uplock actuator, forcing the pin to stay ou
t.=C2-=C2- If you find there is no pressure on the actuator or diverter
valve and the pin remains out, pull the uplock actuator, disassemble, clea
n and overhaul it because the spring inside the uplock actuator is not able
to retract the pin when no pressure is on the uplock actuator.Dennis
From: Lancer <lrob4783@bigpond.net.au>
To: yak-list@matronics.com
Sent: Tuesday, November 14, 2017 6:10 AM
Subject: Yak-List: Re: Gear not locking up
Is the Emergency air valve securely closed?
--------
You can run but you can't hide
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=474963#474963
-==C2- --> http://www.matronics.com/Navigator?Yak-List
great content also available via the Web Forums!
s.matronics.com/" target="_blank">http://forums.matronics..matronics.com/
" target="_blank" ==C2-="" =C2-="" -matt="" dralle,="" list
="" admin.http://www.matronics.com/contribution
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Message 5
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| Subject: | Re: Accident Report Yak-52 forced landing due engine failure. |
Thank you Bill for your comments.
One thing I'd like to add. Engine thru bolts separating in the case is indeed
a description of an engine failure. No doubt about it. HUGE! When the case
comes apart, that's an engine failure! Glad you landed safely (!!!).
Running an airplane out of gas at which time the engine stops running is really
not "an engine failure" per se. Neither is an engine that stops running due
to lack of fuel because the carburetor is clogged with something that should
not be in there.
My only point here is that the reader takes away a completely different "lesson
learned" from your example where a major engine internal component failed, than
from a perfectly good engine that stops running due to lack of fuel, caused
by something that got into the carburetor.
And in my opinion, you are again 100% correct when you said that we could still
trust our same engine shop to build us an engine again. In this case, the Aerometal
shop mentioned in the original posting.
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Bill Geipel
Sent: Monday, November 13, 2017 3:08 PM
Subject: [Non-DoD Source] Re: Yak-List: Accident Report Yak-52 forced landing due
engine failure.
I think stories all have value. Lessons learned. Goes to show you that new engine
or not, professional or not, its those that have and those that will have it
happen. The one time you dont plan on it, Boom! As far as blaming the new engine,
that also happens. I had a new Bonanza with less than 50 hours. Engine thru
bolts separated as did the block. (at 5000 directly above an airport) Continental
didnt take it personally. It happens. And I didnt take offense to it when
they asked me if I ran the hell out of it like many do with the yak/cj. Of
course I didnt mention it to the world on line. We didnt have an On-Line back
then. Just because it ran good in the morning doesnt mean it wont blow up in
the afternoon.
Keep the stories coming. Whether u admit it or not, most of us will know what happened.
So help the next guy to not make the same mistake. Could be the motor,
could be the pilot.
Id be willing to bet that we would still trust our same engine shop to build us
an engine again.
bill
> On Nov 14, 2017, at 03:38, Bitterlich, Mark G CIV NAVAIR, WD <mark.bitterlich@navy.mil>
wrote:
>
> --> <mark.bitterlich@navy.mil>
>
> I almost had an engine related problem myself recently. While getting ready
to start my new Siai-Marchetti 1019, I decided to turn the individual fuel tank
pumps off because I wanted to reduce current draw to that $2500 battery.
Startup and departure were normal. While flying at 2000 feet over heavily wooded
terrain, out of the corner of my eye I spotted a yellow caution light. LOW
MAIN FUEL was written right below the warning light, one that I had never seen
come on before. A quick glance at the left inboard tank (which directly feeds
the turbine) showed it nearly empty. My INTERNAL light bulb lit up and I
quickly turned all the tank pumps back on again, while getting ready to switch
the fuel selector to emergency feed. Thankfully luck prevailed and the left
inboard was quickly refilled by the other tanks pumps. This close call was 100%
my fault. That said, I am not an airplane pilot, and I do not fly right
seat on commercial carriers thus it is OK for me to !
ad!
> mit I made a mistake. Of course my story has no immediate value to readers of
the YAK List, but neither does the posting below.
>
> Mark Bitterlich
>
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com] On Behalf Of Etienne
> Verhellen
> Sent: Friday, November 10, 2017 7:55 PM
> To: yak-list@matronics.com
> Subject: [Non-DoD Source] Yak-List: Accident Report Yak-52 forced landing due
engine failure.
>
>
> Yak-52 Accident Report just released by UK Air Accident Investigation
> Branch (AAIB) - Forced landing following engine failure -
> Cause(s) of engine failure not fully determined ...
>
> https://www.gov.uk/aaib-reports/aaib-investigation-to-yak-52-g-yakb
> https://assets.publishing.service.gov.uk/media/59e9f18ced915d6aadcdaf3
> a/Yak-52_G-YAKB_11-17.pdf
>
> Also had a Yak-52 (G-CBSS) engine failure that led to a forced landing on Tuesday
14 February 2017, 11:45 LT - Belgium.
>
> http://siena.rosselcdn.net/sites/default/files/dpistyles_v2/ena_16_9_e
> xtra_big/2017/02/14/node_45023/117972/public/2017/02/14/B9711130446Z.1
> _20170214202028_000%2BG548HAFT3.2-0.jpg?itok=qKon6c7X
>
> Engine (M-14P) had recently been overhauled by Aerometal (Hungary)...
>
> http://siena.rosselcdn.net/sites/default/files/dpistyles_v2/ena_16_9_e
> xtra_big/2017/02/14/node_45023/117973/public/2017/02/14/B9711130446Z.1
> _20170214201956_000%2BGNN8HB8DG.1-0.jpg?itok=CXmXyV-2
>
> Engine will NOT be examined by Air Accident Investigation Unit -AAIU (Belgium)...
>
> So ... cause(s) of the engine failure will not be determined either
> ... :-(
>
> http://img11.hostingpics.net/pics/461381f4ce631af2b611e6a9bffb31cfa4c3
> 40webscale0128038201280382.jpg
>
> Shit happens ... I am now walking like an old man [Rolling Eyes]
>
> But Very Happy to be able to keep flying 747 ... to pay the bills ...
> and to have fun with the magnificent Yakovlevs Yak-50 -50
> :D :D 8) [Laughing] YOLO !
>
> https://pbs.twimg.com/media/DNOkCXIX0AAVfZS.jpg:large
> https://i.pinimg.com/originals/f4/af/c9/f4afc9bb4896f45aa8e3e8cf19d599
> b5.jpg
> https://farm5.staticflickr.com/4445/24136532688_cb19419ee8_o.jpg
>
> Have a good Week-End, flying if possible.
>
> --------
> Yak-52 training anywhere - FI(A) Aerobatic Instructor - Specialised Yak-52.
> http://www.afors.com/index.php?page=adview&adid=25551&imid=4
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=474754#474754
>
>
>
>
> Attachments:
>
> http://forums.matronics.com//files/yak_50_low_pass_2_verhellen_etienne
> _sp_yeh__50__ebcf__14oct17__julien_devester_28_169.jpg
> http://forums.matronics.com//files/yak_50_low_pass_1_verhellen_etienne
> _sp_yeh__50__ebcf__14oct17__julien_devester_34_447.jpg
> http://forums.matronics.com//files/extra__yak_50_416.jpg
> http://forums.matronics.com//files/yak_50_lomcevak_verhellen_etienne__
> sp_yeh__50__ebcf__14oct17__julien_devester_23_192.jpg
> http://forums.matronics.com//files/yak_50_sp_yeh_verhellen_etienne__50
> __ebcf__14oct17__julien_devester_33_205.jpg
> http://forums.matronics.com//files/yak_50_august_2017__arcachon_france
> __etienne_verhellen_refueling_2_173.jpg
> http://forums.matronics.com//files/yak_50_august_2017__arcachon_france
> __etienne_verhellen_1_164.jpg
> http://forums.matronics.com//files/yak_50_etienne_verhellen_photo_by_l
> uc_barry_212.jpg
> http://forums.matronics.com//files/yak_50_formation_flying__208.jpg
> http://forums.matronics.com//files/yak_50_sp_yeh_etienne_verhellen__50
> __ebcf__14oct17__julien_devester_14_124.jpg
> http://forums.matronics.com//files/yak_50_sp_yeh_etienne_verhellen__50
> __ebcf__14oct17__julien_devester_38_184.jpg
> http://forums.matronics.com//files/yak_50_sp_yeh_etienne_verhellen__50
> __ebcf__14oct17__julien_devester_39_676.jpg
> http://forums.matronics.com//files/yak_50_sp_yeh__50__ebcf__14oct17__j
> ulien_devester_42_173.jpg
> http://forums.matronics.com//files/yak_50_sp_yeh__50__ebcf__14oct17__j
> ulien_devester_53_541.jpg
> http://forums.matronics.com//files/yak_50_sp_yeh__50__ebcf__14oct17__j
> ulien_devester_56_210.jpg
> http://forums.matronics.com//files/yakovlevs__4_yak_50__2_yak_52_159.j
> pg
> http://forums.matronics.com//files/yakovlevs_yak_50__etienne_verhellen
> ____50__jak_50_654.jpg
> http://forums.matronics.com//files/_50_in_biscarosse__saturday_19_augu
> st_2017__ken_and_etienne__f_azol_jean_luc_langeard_267.jpg
> http://forums.matronics.com//files/_50_ken_briefing_etienne_4_718.jpg
> http://forums.matronics.com//files/_50_yakovlevs_yak_50_etienne_verhel
> len_by_luc_barry_1_963.jpg
> http://forums.matronics.com//files/_50_yakovlevs_yak_50_etienne_verhel
> len_by_luc_barry_2_204.jpg
> http://forums.matronics.com//files/_50_yakovlevs_yak_50_etienne_verhel
> len_by_luc_barry_3_136.jpg
> http://forums.matronics.com//files/_50_yakovlevs_yak_50_etienne_verhel
> len_by_luc_barry_4_208.jpg
> http://forums.matronics.com//files/_50_yakovlevs_yak_50_etienne_verhel
> len_by_luc_barry_5_407.jpg
> http://forums.matronics.com//files/__50_sp_yeh_136.jpg
> http://forums.matronics.com//files/engine_failure__forced_landing__yak
> _52_janie_g_cbss_etienne_verhellen_14_02_2017_15_488.jpg
> http://forums.matronics.com//files/engine_failure__forced_landing__yak
> _52_janie_g_cbss_etienne_verhellen_14_02_2017_29_202.jpg
> http://forums.matronics.com//files/engine_failure__forced_landing__yak
> _52_janie_g_cbss_etienne_verhellen_14_02_2017_30_214.jpg
> http://forums.matronics.com//files/engine_failure__forced_landing__yak
> _52_janie_g_cbss_etienne_verhellen_14_02_2017_8_485.jpg
>
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Message 6
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| Subject: | Pulling Yak Wings |
Hello, All
I was a member of this list over a decade ago, when I was thinking about buying
a Yak as my first airplane. Many years and many airplanes later, Ive finally
bought one. Unfortunately, its a wreck that I will be parting out instead of flying.
Since its pretty torn up, I will need to trailer it home ... about 800 miles. That
means I need to at least pull the wings from it. Has anyone here been through
the drill of assembly/disassembly and can tell me the procedure?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=474980#474980
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