PPRuNe Forums - View Single Post - Are Engine- out SIDS supposed to be flown in Selected guidance
Old 20th Mar 2019, 20:35
  #18 (permalink)  

Only half a speed-brake
Join Date: Apr 2003
Location: Commuting home
Age: 42
Posts: 2,703
We used to fly overlay, manually created LNAV guidance for VOR approaches to airports not in FMS database on the 737 with 2 IRS and no GPS. Not the slightest problem.

Now, Airbus themselves (were made to) claim flying VOR NPA from the box with the underlying NAVAID being U/S is OK, as long as some very relevant precautions are taken.
And at the same time, Airbus prohibits use of NAV for manually created approaches. Que?

The explanation, the very same I believe applies to OP's question, is that the restrictions are operational - i.e. avoiding human error and the training cost - and not technical. Agreed with Check Airman and sonicbum. The idea you can create a waypoint but not allowed to fly them in NAV is completely silly (respecting peculiar applications in the terminal and approach area).
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