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xl(at)prosody.org
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 Posted: Thu Aug 17, 2006 8:50 pm Post subject: nylon brake lines - mine broke |
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As I reported, my nylon brake line broke on the way to Abbotsford, BC.
The attachments gave way and allowed the line to flex in the airstream.
In the field we took the fitting apart and reinstalled the existing line.
I noted that the line was crazed. I'm using the 'flexible nylon tubing'
supplied by Zenith Aircraft.
Back at BFI I replaced the brake line that was under the wing.
I think that it was UV that did the damage. The brake line that I removed
was brittle in spots and easily snapped.
Here is a quote from Aircraft Spruce:
'Nylo-Seal type "NNR" semi-rigid natural color tubing is made of Nylon-II
and is far superior to other types of Nylon tubing. It does not depend on
moisture for flexibility and does not become brittle. It has excellent
resistance to flexural fatigue and can be used where there is vibration
or tube movement.'
Matbe what I have is not Nylon-II.
I'll still use nylon because it is easy to work with.
But I'll replace the exposed line every two years.
633Z has been outside since November 2003.
The brake line inside the airframe doesn't appear to be crazed.
But, I figure it will age too.
I could still taxi without the right brake.
When I applied the left brake I needed lots of 'right rudder'.
Joe E
N633Z (at) BFI
CH601XL 379 hours
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p.mulwitz(at)worldnet.att
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| Posted: Thu Aug 17, 2006 9:17 pm Post subject: nylon brake lines - mine broke |
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It sounds like your plastic brake line is being attacked by
ultra-violet light. This is a common problem with most plastics. I
am not sure about the nylon, but nearly all plastic formulations are
attacked by sunlight and particularly the UV portion of sunlight.
If you insist on using plastic in sunlight environments, it might
help to paint it white. This may reflect some of the damaging radiation.
Paul
XL fuselage
do not archive
| Quote: | But I'll replace the exposed line every two years.
633Z has been outside since November 2003.
The brake line inside the airframe doesn't appear to be crazed.
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mtherr(at)yahoo.com
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| Posted: Fri Aug 18, 2006 3:02 am Post subject: nylon brake lines - mine broke |
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If I remember, there are two plastic tubing we can
use. Nylaflow, which is the more common, less
transparent, lower burst pressure, and Nylo Seal that
is a more rigid, transparent and higher burst pressure
(and a more expensive). I guess you have the Nylaflow
tubing.
I'm using NiloSeal and I do not have this problem ....
yet. I noticed however, that the red brake lube tends
to turn yellow after a while. I flushed and replaced
the lube a month ago.. I'll see if it stays red (btw,
the lube that was flushed was more pink than yellow...
it just appeared yellow in the tubing).
Michel
--- xl <xl(at)prosody.org> wrote:
| Quote: |
<xl(at)prosody.org>
As I reported, my nylon brake line broke on the way
to Abbotsford, BC.
The attachments gave way and allowed the line to
flex in the airstream.
In the field we took the fitting apart and
reinstalled the existing line.
I noted that the line was crazed. I'm using the
'flexible nylon tubing'
supplied by Zenith Aircraft.
...
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----------------------------
Michel Therrien CH601-HD, C-GZGQ
http://mthobby.pcperfect.com/ch601
http://www.zenithair.com/bldrlist/profiles/mthobby
http://pages.infinit.net/mthobby
__________________________________________________
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steveadams
Joined: 10 Jan 2006
Posts: 191
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| Posted: Mon Aug 21, 2006 5:03 am Post subject: Re: nylon brake lines - mine broke |
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All of the plastic/nylon/rubber hoses used in the Zodiacs have a finite lifespan. For the CH640 they recommend new lines every 5 years for fuel and brakes, but for brake lines exposed to the elements the timeframe may be shorter. The tubing is cheap and brake lines are relatively easy to replace. It's easy enough to check by giving them a little bend during the preflight. I'd recommend everyone make up a list of things on the airplane, (like the brake lines, hoses, ELT battery, vacuum pump etc), that need to be changed periodically and add those to your list of things to do during the annual condition inspection. It's relatively inexpensive and better than waiting for problems to develop in these critical areas.
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