Originally Posted by
Oldaircrew
That’s a good argument for the mplementation of monitored approaches in limited visibility.
plus, does nobody do basic height/distance checks as part of their approaches anymore? It’s considered an SOP at many airlines.
It doesn't capture the error here as mentioned above.
Think if the platform altitude for the FAF was 3000' AGL at 10 miles. With a barometer set 10hPa high, your altimeter will show 3000' but you'd actually be at an altitude of 2700'. This error is maintained the whole way down the approach path - you are reading what appear to be correct altitude readings v the distance, but you are actually 300' lower at each mile. This culminates in you being at 0' at 1nm from the threshold, with your altimeter reading 300'.