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Throttle cable failure

 
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duc(at)farmline.com
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PostPosted: Wed Feb 15, 2006 6:34 am    Post subject: Throttle cable failure Reply with quote

My aircraft has just suffered a throttle cable failure - luckily whilst on
maintenance. I had dropped the throttle lever box to enable upholstery to be
completed; after refitting the box, and exercising the throttle for
duplicate checks, one cable broke. The break is where the inner core of the
cable joins the nipple attaching the cable to the throttle lever; the nipple
is perfectly free to pivot on its bolt.



The cables have always been a little hard to move - at least when the engine
is not running; because of this internal friction, it appears that when the
throttle is opened the cable can bend down into the box, rather than slide
through the outer.



Two questions arise:



1 Am I right in thinking that there has been some sort of advisory
advice about throttle cables from the factory - if so, where should I find
it?



2 Are the throttle cables currently being issued by the factory
either teflon or nylon lined, and therefore less prone to internal friction?



For the record, my aircraft has been flying for 5 years and has done about
300 hours with a 912UL.



I recently read an article in South Africa about Ron van Leer's forced
landing due to fuel leakage through porous "old type" rubber fuel pipes -
the cotton covered pipes issued by the factory in the early years. I do hope
that no-one is still flying with this type of flexible fuel pipe still
installed; if you are, you are heading for engine failure if you do not
notice seepage before you lose your power. I did note seepage in my aircraft
a year or so ago, and very quickly changed my pipes for the current issue
material.



David



G-BZAM - UK 265


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ward.t(at)xtra.co.nz
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PostPosted: Wed Feb 15, 2006 11:33 am    Post subject: Throttle cable failure Reply with quote

David,
Likewise, I changed all my fuel piping. The company issue is of very bad
quality and permeates easily to create a fuel smell in the cockpit and
eventual seepage. I eventually used marine fuel hosing.
Cheers,
Tim
Tim Ward
12 Waiwetu Street,
Fendalton,
Christchurch, 8005
New Zealand.
Ph +64 3 3515166
Mobile 021 0640221
ward.t(at)xtra.co.nz
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bryan(at)blackballclub.co
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PostPosted: Wed Feb 15, 2006 1:41 pm    Post subject: Throttle cable failure Reply with quote

Hi David,

I have just replaced a throttle cable which I damaged whilst servicing. It
was a new one from Europa, and identical to the original which had been in
service for five years in my XS 912s.

It does not appear to be lined, but then it does not have have any undue
internal friction and works well. I had to cut it to about three feet in
length. It routes in an arked path from the throttle control box, over the
top of the engine frame ( at either side of the elastic), and then straight
into the carb.

I know that this may not be a great deal of help, but then it could be.

Cheers! Bryan
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william(at)wrmills.plus.c
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PostPosted: Wed Feb 15, 2006 10:23 pm    Post subject: Throttle cable failure Reply with quote

Hi David,
I have just shortened both of mine, which are the originals (1994 ish), to
give them a smoother route and fresh ends for clamping and I can assure you
they have some sort of white plastic inner lining.
Hope that helps,
William

Do not archive
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erichdtrombley(at)juno.co
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PostPosted: Thu Feb 16, 2006 9:03 am    Post subject: Throttle cable failure Reply with quote

Sorry to learn of yet another throttle cable failure. Fortunately it occurred on the ground. I fear that this will not be last failure to be reported with the next chap not being so lucky. As I have posted several times over the years on this forum good engineering practice would not call for the use of a stranded wire cable for compressive loads. The stranded wire cable used in Europa throttle quadrant is especially vulnerable to kinking and fatigue failure. Just because it hasn't failed on you yet doesn't mean it won't. It is only a matter of time.
How many certified aircraft do you see using this type of arrangement? Most use a solid wire vernier/bowden cable...which is most suitable to the task. The good news is that the Europa throttle is easily modified for use of a solid wire bowden cable. I will not go into the details on the modification as it can be found in the archives.
Regards,
Erich Trombley P.E.
N28ET Classic Mono 914
For some reason yet to be determined this message will be repeated by Juno. I apologize.


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Sorry to learn of yet another throttle cable failure. Fortunately it occurred on the ground. I fear that this will not be last failure to be reported with the next chap not being so lucky. As I have posted several times over the years on this forum good engineering practice would not call for the use of a stranded wire cable for compressive loads. The stranded wire cable used in Europa throttle quadrant is especially vulnerable to kinking and fatigue failure. Just because it hasn't failed on you yet doesn't mean it won't. It is only a matter of time.


How many certified aircraft do you see using this type of arrangement? Most use asolid wire vernier/bowden cable...which is most suitable to the task. The good news is that the Europa throttle is easily modified for use of a solid wire bowden cable. I will notgo into the details on the modification asitcan be found in the archives.


Regards,


Erich Trombley P.E.
N28ET Classic Mono 914


For some reason yet to be determined this message will be repeated by Juno. I apologize.


Try Juno Platinum for Free! Then, only $9.95/month!


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pete(at)lawless.info
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PostPosted: Thu Feb 16, 2006 3:02 pm    Post subject: Throttle cable failure Reply with quote

Sorry Jos but the things kink between the connection to the throttle
lever in the cockpit and the start of the cable outer. There is no
dispute about that I have seen it with my own eyes and spent a happy
half hour on the hanger floor changing the thing. Maybe the springs are
not strong enough to overcome the friction in the cable?

Regards

Pete

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nwcmc(at)tiscali.co.uk
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PostPosted: Sat Feb 18, 2006 4:40 am    Post subject: Throttle cable failure Reply with quote

I have fitted 2 sets of cables now having recently changed the front end
of my Europa to XS specification. In both cases I took care to ensure
the smoothest of routing for the cables and cut them to an ideal length
for fitting to the carbs. The original set had minimal wear when
removed. They were only replaced because the XS setup requires them to
be about 100mm longer. During the early days of the first set I did not
have quite enough friction and I was having to hold the throttle back
from advancing on descent. I would suggest that final throttle friction
is not set until full and free movement is achieved with a lesser
friction. It should then be obviously if the cable routing and
attachment is correct.

Nigel Charles

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