Kevin Horton
Well Known Member
I'm looking for service history experience with ACK A-30 altitude encoders. I've got an ACK A-30 (mod 3, I think, based on the serial number). The altitude reported by mine drifted out of tolerance last year - I had it recalibrated by a local avionics shop, and it was fine for awhile, but now it seems to have once again drifted down about 200 ft compared to my two altimeters. Just like last time it did this, I checked for a static leak, but the system is as tight as a drum.
I'm not sure if I have a bad encoder that tends to drift, or whether ACK-30s are not reliable. If ACK A-30s are generally reliable, the simplist thing is to buy a new one. If ACK A-30s are problematic, I'll change to something else. Or, is there perhaps something strange with my installation that could be causing the encoders to go out of tolerance?
Comments are appreciated.
I'm not sure if I have a bad encoder that tends to drift, or whether ACK-30s are not reliable. If ACK A-30s are generally reliable, the simplist thing is to buy a new one. If ACK A-30s are problematic, I'll change to something else. Or, is there perhaps something strange with my installation that could be causing the encoders to go out of tolerance?
Comments are appreciated.