Originally Posted by
A and C
So are you telling me that it's just that bunch of bitter & twisted ex-navigators from aviation house that keep saying "no" without giving a reason?
If so I would like them to make the safety case for GPS vs NDB approches.
Sadly, my understanding of the process is the safety case must be made on an absolute basis not relative. So you specifically can NOT say, this NDB approach is authorised for use, my new approach follows the same track, uses equipment with a greater positional accuracy at all stages of the approach, has superior fault detection to the NDB, ergo is at least as safe as an NDB approach - Safety case QED.
In addition, I am lead to believe that the general issues around establishing the safety (or lack thereof) of the GPS signal-in-space quality,detection and response has not been agreed by the CAA and must be 'reproved' for each approach's safety case.