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In a message dated 9/21/2006 9:57:26 PM Eastern Daylight Time, [EMAIL PROTECTED] writes:
My vertical airspeed indicator no longer registers zero - (-200fpm)
Scott,
The static ports on the Ercoupe are located on the sides of the pitot tube. The pitot tube has two air lines going to/from it. One is the pitot, the other is the static.
You didn't mention whether or not your VSI reads 200 FPM low when the plane is sitting on the ground. If it is, then you may be able to correct the error by adjusting the VSI. There should be a small adjustment screw on the face of the VSI, usually on the lower left hand corner of the instrument. This is the "zero adjust" screw. Try turning this screw slightly while tapping on the VSI and see if that fixes the problem. Usually it only takes a tiny bit of movement to zero it. If you can't zero it on the ground by adjusting the screw, then it's broke.
If the VSI is reading zero on the ground, but 200 FPM low in flight, then you probably have some type of pitot static system problem, as there's no "internal" reason it should read continually low in flight, but not on the ground. The VSI is really nothing more than a calibrated leak anyhow, so if the pressure is not changing, it should read zero if it reads zero on the ground.
Let us know what you find out.
Best Regards,
Wayne DelRossi
Alon N5618F
Hours logged since restoration: 174.4
Wayne DelRossi
Alon N5618F
Hours logged since restoration: 174.4
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