On Nov 13, 5:50*pm, Bruno wrote:
On my last flight my audio vario suddenly started to read a consistent
300-400 fpm too high for the present conditions. *I have a mechanical
vario that remained accurate and on my L-Nav screen my average fpm
sink rate was correct. *Any ideas what I can check? *It was really
annoying when I was sinking at a true 300 fpm on glides but my audio
was telling me I was going up 100fpm. *If only it was always that way
in real life! *

Thanks,
Bruno - B4

Look for internal leak on capacity side of fate of climb sensor.
Connected with tubing which gives up. TE suction causes flow through
sensor.
Good luck '
UH