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george.coy(at)gmail.com
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 Posted: Tue Oct 12, 2010 11:49 am Post subject: AK-14 carburetor |
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Just a word of caution about fuel flow sending units. We are aware
of two incidents and possibly an accident where U.S. hose was substituted
for the Russian hose. In these cases the cause of the problem was diagnosed
as a rubber "flap" that was cut on the inside diameter of the hose during
installation of the Russian Banjo fitting. It is almost impossible to
inspect the hose for an internal flap at the Banjo fitting.
The Banjo fitting is the fitting at the top of the "black" fine
filter located on the firewall on the top right hand (sitting in the
cockpit) side of the firewall. This is the line from the fine filter to the
carburetor. This is also the line where the fuel flow sensors are usually
are installed.
The two incidents we are aware of had normal operation for run up
but severely reduced fuel flow at take off power settings. They were very
difficult to diagnose as well.
The fuel flow sensors are usually a "Paddle Wheel" and are located
in the line to the carburetor. Any contamination in the line (rubber chips
from a new hose etc) can jam the "paddle wheel" and cause reduced fuel flow
as well.
George Coy
CAS Ltd.
714 Airport Rd.
Swanton VT 05488
802-868-5633 off
802-363-5782 cell
george.coy(at)gmail.com
http://coyafct.com/
SKYPE george.coy
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dsavarese0812(at)bellsout
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| Posted: Tue Oct 12, 2010 3:55 pm Post subject: AK-14 carburetor |
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Good points George (as always). One additional point with regard to the fuel flow transducer, the paddle wheel which is inside the fuel flow transducer can also be easily damaged by rubber chips disintegrating from the "flap" in hose. On the JPI FS-450, that's an over-$200 replacement part.
Dennis
[quote] ---
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mark.bitterlich(at)navy.m
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| Posted: Tue Oct 12, 2010 5:09 pm Post subject: AK-14 carburetor |
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Thanks for saving my ass George. Borescope from work will be used on this one!
Mark
________________________________
From: owner-yak-list-server(at)matronics.com on behalf of George Coy
Sent: Tue 10/12/2010 3:46 PM
To: yak-list(at)matronics.com
Subject: RE: AK-14 carburetor
Just a word of caution about fuel flow sending units. We are aware
of two incidents and possibly an accident where U.S. hose was substituted
for the Russian hose. In these cases the cause of the problem was diagnosed
as a rubber "flap" that was cut on the inside diameter of the hose during
installation of the Russian Banjo fitting. It is almost impossible to
inspect the hose for an internal flap at the Banjo fitting.
The Banjo fitting is the fitting at the top of the "black" fine
filter located on the firewall on the top right hand (sitting in the
cockpit) side of the firewall. This is the line from the fine filter to the
carburetor. This is also the line where the fuel flow sensors are usually
are installed.
The two incidents we are aware of had normal operation for run up
but severely reduced fuel flow at take off power settings. They were very
difficult to diagnose as well.
The fuel flow sensors are usually a "Paddle Wheel" and are located
in the line to the carburetor. Any contamination in the line (rubber chips
from a new hose etc) can jam the "paddle wheel" and cause reduced fuel flow
as well.
George Coy
CAS Ltd.
714 Airport Rd.
Swanton VT 05488
802-868-5633 off
802-363-5782 cell
george.coy(at)gmail.com
http://coyafct.com/
SKYPE george.coy
| | - The Matronics Yak-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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radiopicture
Joined: 23 Jun 2008
Posts: 263
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| Posted: Tue Oct 12, 2010 5:44 pm Post subject: AK-14 carburetor |
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I also had a hose flapper from American hose in the RU fittings. Devil
of a time figuring out what my surging was about. Turned out to be a
rubber clump approximately the size of your head. Amazing it ran like
that.
On Oct 12, 2010, at 9:04 PM, Bitterlich, Mark G CIV Det Cherry Point,
MALS-14 64E wrote:
| Quote: |
Point, MALS-14 64E" <mark.bitterlich(at)navy.mil>
Thanks for saving my ass George. Borescope from work will be used
on this one!
Mark
________________________________
From: owner-yak-list-server(at)matronics.com on behalf of George Coy
Sent: Tue 10/12/2010 3:46 PM
To: yak-list(at)matronics.com
Subject: RE: AK-14 carburetor
Just a word of caution about fuel flow sending units. We are
aware
of two incidents and possibly an accident where U.S. hose was
substituted
for the Russian hose. In these cases the cause of the problem was
diagnosed
as a rubber "flap" that was cut on the inside diameter of the hose
during
installation of the Russian Banjo fitting. It is almost impossible to
inspect the hose for an internal flap at the Banjo fitting.
The Banjo fitting is the fitting at the top of the "black" fine
filter located on the firewall on the top right hand (sitting in the
cockpit) side of the firewall. This is the line from the fine filter
to the
carburetor. This is also the line where the fuel flow sensors are
usually
are installed.
The two incidents we are aware of had normal operation for
run up
but severely reduced fuel flow at take off power settings. They were
very
difficult to diagnose as well.
The fuel flow sensors are usually a "Paddle Wheel" and are
located
in the line to the carburetor. Any contamination in the line (rubber
chips
from a new hose etc) can jam the "paddle wheel" and cause reduced
fuel flow
as well.
George Coy
CAS Ltd.
714 Airport Rd.
Swanton VT 05488
802-868-5633 off
802-363-5782 cell
george.coy(at)gmail.com
http://coyafct.com/
SKYPE george.coy
|
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viperdoc(at)mindspring.co
Guest
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| Posted: Tue Oct 12, 2010 6:32 pm Post subject: AK-14 carburetor |
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Been there. Done that. Got the T shirt. Dead stick the 50 back onto runway
after engine quit at 50 ft on T.O. Flapper fragments in the fine finger
screen from the "NEW" RU fuel line after IRAN in RU before shipping her
over. The only hint was a sudden hesitation at 70% run up one time. There
were fragments of the inner fuel lining in the finger screen in the carb. At
high flow the flapper fragments would block the fuel flow into the carb.
Doc
--
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