PPRuNe Forums - View Single Post - Are Engine- out SIDS supposed to be flown in Selected guidance
Old 20th Mar 2019, 18:48
  #17 (permalink)  
sonicbum
 
Join Date: Mar 2012
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Age: 100
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Originally Posted by Skyjob View Post
Think to poster's airline makes a valid point in its restriction, as it means NAV is not allowed below the obstacle critical altitude being MSA.
Once above MSA, obstacles are no longer assessed, thus NAV is safe to be used.
It ensures crew restrict themselves from overbanking and obstacle proximity by using Selected Guidance with its imposed bank angle limits.
I believe the restriction on using NAV below MSA for pilot's created waypoints is primarily due to CFIT prevention. The "overbanking" is not really an issue in Airbus FBW in both Hdg/Trk and NAV mode.
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