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shirleyh
Joined: 05 Jun 2006
Posts: 15
Location: Perth, Western Australia
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 Posted: Sun Oct 07, 2007 12:08 am Post subject: Altimeter error |
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Today the altimeter in our RV6 developed a strange fault. When we set
airfield elevation on the ground the pressure displayed was much lower than
reported on the forecast. We set the forecast qnh and that gave an altimeter
error of about 600 feet high. We reset to airfield elevation and took off.
At altitude we set the area qnh reported on Jandakot ATIS which was 20 mb
higher than our altimeter was indicating.
We've checked the static lines - no blockages or leaks that we can find. Any
thoughts?
Cheers
Shirley
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altoq(at)cebridge.net
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| Posted: Sun Oct 07, 2007 9:57 am Post subject: Altimeter error |
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Shirley,
Anything in an airplane that has preformed well for a long time and then
suddenly has a change should be looked at by someone with experience in that
field. That being said, and if you are sure that altimeter is otherwise
functioning correctly, with reasonable care try this. Adjust the altimeter
to airfield elevation. Near the adjustment knob there is a flat head screw.
Carefully turn it out until the head just clears the face of the instrument
but still is engaged in the threads. The screw is engaged in a small rod
that locks the knob in position. Try not to let it come out or lose it.
Slide the screw away from the adjustment knob to unlock it. With care, pull
out on the knob. In this position the knob will only adjust the Kollsman's
window. Set the QNH in the Kollsman's window. When manipulating the knob in
and out, use a very slight and gentle twisting force to accommodate its
movement. Move the knob to the in position, slide the screw/lock back to
where the screw can be turned in to its original position. If its within 50
ft you got it, if not, do it again.
Careful,
John D.
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shirleyh
Joined: 05 Jun 2006
Posts: 15
Location: Perth, Western Australia
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| Posted: Fri Oct 19, 2007 3:22 am Post subject: Re: Altimeter error |
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Thanks to all who offered advice regarding my faulty altimeter. I took it to a professional and he found that the subscale mechanism was loose. He was able to reset the subscale and reassemble the altimeter and it then checked out fine up to 40000ft. We will see how long it holds up - if it fails again then it gets consigned to the bin
Shirley
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