Google ICAO Doc 4444 and look up chapter '8.5.5 Level information based on the use of pressure-altitude information'.
If you have an LAA aircraft, you can forget about that, because Francis will only allow 50'.
it also takes into account any errors that may be present in the ATC side of the system.
Farmstripflyer wrote:The static line for the transponder is just a stubby tube coming out of the back, not connected to anything, this however has not been a problem for the last six years!
that would mean that two aircraft which are provided with standard vertical separation using assigned levels 1000 feet apart could be indicating as close as 200 feet...
rainbow462 wrote:old thread I know but hoping "@Farmstripflyer" is still active and how the story ended as I have a similar issue. Just fitted PAW and RS232 cable to funke TRT800H transponder. PAW all fine and ADSB position reporting correct but transponder FL now all over the place with errors as much as 1,500' Conclusion to story or any similar experiences/ideas gratefully received. Many thanks