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riddon(at)sent.com
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 Posted: Mon Jun 24, 2013 6:31 am Post subject: Misreading altimeter, TWICE! |
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I have a problem with my (Chinese) altimeter. I am out of the country for a few months each year but when I got back this time I discovered that my altimeter was reading around 5500 ft. This is the second time I have had this problem. First time was a couple of years ago and I replaced the altimeter with another unit. This has been Ok but now the second one is again reading 5500ft.
I guess I will have to shell out on yet another unit but would be interested to know if anyone else has experienced any similar problems?
The only thing I can think of which might have a bearing is that I normally connect the pitot to the static line when I am away to stop spiders crawling up there but I can't see how that can affect anything.
Richard Iddon
G-RIXS
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frans(at)privatepilots.nl
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| Posted: Mon Jun 24, 2013 6:55 am Post subject: Misreading altimeter, TWICE! |
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On 06/24/2013 04:29 PM, Richard Iddon wrote:
| Quote: | The only thing I can think of which might have a bearing is that I
normally connect the pitot to the static line when I am away to stop
spiders crawling up there but I can't see how that can affect
anything.
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If your system is leak free, the instuments will receive quite a jolt
when you disconnect the pitot from the static after the ambient pressure
has been changed. Such a jolt can easily damage the gear in the altimeter.
It is best to incorporate a small leak, just a pinhole in the connecting
tube, to keep the pressure similar to the outer pressure.
Frans
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pete(at)lawless.info
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| Posted: Mon Jun 24, 2013 7:19 am Post subject: Misreading altimeter, TWICE! |
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Frans
Would you not get that leakage from the VSI?
Pete
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pete(at)lawless.info
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| Posted: Mon Jun 24, 2013 7:25 am Post subject: Misreading altimeter, TWICE! |
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Frans
Ignore me VSI is static to static not static to free air.
Pete
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brian.davies(at)clara.co.
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| Posted: Mon Jun 24, 2013 8:33 am Post subject: Misreading altimeter, TWICE! |
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Hi Richard,
I have had the same problem with a Chinese altimeter. Mine only went to
4000 feet and I did not touch the pitot or static. I purchased an
(expensive) Winter altimeter and have had no more problems. If I remember
rightly, I reset it once by disengaging the baro adjust mechanism but it did
it again within 12 months.
Regards
Brian Davies G-DDBD
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graeme bird
Joined: 15 Jul 2010
Posts: 434
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| Posted: Mon Jun 24, 2013 9:18 am Post subject: Re: Misreading altimeter, TWICE! |
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yes I have had that on a Falcon one. I put it down to an extreme of pressure and sudden change.
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_________________
Graeme Bird
kit4 (Wagstaff) TBD
Kit3 G-CLXU (Gregory) mono 914 xs Woodcomp
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