David F Posted July 2, 2010 Share Posted July 2, 2010 My VSI reads 200 fpm descent when it is level (ie even taxi ing along level ground) I find this annoying is this fixable or do I need a new one. Its a bit of a major job to get it out of the dashboard. Dave Link to comment Share on other sites More sharing options...
flying dog Posted July 2, 2010 Share Posted July 2, 2010 I think you need to say what kind it is..... Electronic? Brand? Coz to me, the VSI is more a mechanical gauge rather than "avionics". Link to comment Share on other sites More sharing options...
Thalass Posted July 2, 2010 Share Posted July 2, 2010 Bah. It's still an instrument. :P It's an odd thing, really. Where is your static sensor? For the VSI to indicate a descent, the pressure on the static port has to be steadily higher than the restricted hole in the case - as when you're descending. How is your altimeter behaving? Of course it could be the needle is bent or something similar. Does the indication vary at all? -300fpm when you're doing a 100fpm descent, -100 when you're climbing at 100fpm? If it's been dropped, perhaps that'd do it. Link to comment Share on other sites More sharing options...
djpacro Posted July 2, 2010 Share Posted July 2, 2010 I know nothing about instruments but I like to go to this website out of interest if I have a problem before I call in the experts: Vertical Speed Indicatior troubleshooting (their tech knowledge is better than their spelling). Suggests a new diaphragm. Link to comment Share on other sites More sharing options...
flying dog Posted July 2, 2010 Share Posted July 2, 2010 That site has a poor reputation when I go there. Link to comment Share on other sites More sharing options...
blueline Posted July 2, 2010 Share Posted July 2, 2010 I have adjusted VSI's using the small screw on the bottom left of the gauge. This is used to set zero. Really easy one minute job. Link to comment Share on other sites More sharing options...
motzartmerv Posted July 2, 2010 Share Posted July 2, 2010 Yep, look close, one of the screws is different( usually) just get a small screwey and wind it to zero.. Link to comment Share on other sites More sharing options...
turboplanner Posted July 2, 2010 Share Posted July 2, 2010 Look on the positive side David, if you roll over into a spin, you'll be much happier, even if only for a short time. Link to comment Share on other sites More sharing options...
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