reply to post by snowcrash911
...... if you maybe explained your position on Hanjour's supposedly impossible (which actually wasn't) corkscrew turn again, in elaborate
detail, in a suitable Pentagon thread, or link me to previous elucidations. I can cite you as a 757 pilot and that helps.
It is clear to see in the NTSB video......the actual turn was a simple approximately 30° average angle of bank, descending turn......something that
happens EVERY day, in commercial aviation.
In fact, it is a commonly understood maneuver (though not commonly practiced by commercial airliners....because it just isn't necessary).
When you want to locate a place to land (and "airstrip"....although in terms of the Pentagon, it was not about "landing" of course.....but, the way to
locate a spot is similar)....you fly overhead the location, then fly a circle back, as you descend.
In military parlance it's called a "circling overhead approach".
I tried to find real-life examples.....there are few. This popped up, and is relevant (although not exactly what was seen on 9/11 @ the
Pentagon....this is an actual maneuver used in specific situations, and only when visibility is limited...this is obviously a training situation, as
this type of Instrument Approach would not be needed in VFR conditions):
Here is another example.....again, a circling approach:
We rarely use the "Circling Approach" anymore in actual airline operations.....it is dated, and outmoded. I can't find the military IFR Approach
Plates for Kanehoe Bay, HI.....it is a military airport.
In fact, the "Circle to Land" procedure, and an Instrument Approach, is really, really out dated....I can't find any old "Circling" Approach
procedures at any of the airports that used to have them.
There is a Wikipedia reference, however....fortunately:
Circling to land
The advent of GPS has made all these old Instrument Approach Procedures obsolete.
But this is not the same, as an "Overhead 360"....
This is one (Overhead 360) done and posted from a simulator, PC program, to visualize:
Here is the relevant NTSB rendition of the American flight 77 FDR:
Please note the "need" for people to add a "soundtrack". Also please note that one particularly adept Internet user has his video popping up on
YouTube first, when conducting a search at that site.....username "JohnDoeXLC" is none other than Rob Balsamo....yeah,
that guy.....
edit on Wed 8 February 2012 by ProudBird because: (no reason given)