PPRuNe Forums - View Single Post - A Sukhoi superjet 100 is missing
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Old 10th May 2012, 15:36
  #170 (permalink)  
PJ2
 
Join Date: Mar 2003
Location: BC
Age: 76
Posts: 2,484
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Sam - welcome to PPRuNe.

You, and a few other posters commenting on the TAWS switch-lights have it right.

The TAWS can be turned off, without affecting GPWS Modes 1 - 5.

If the GPS position is inaccurate, TAWS will not be available.

I had assumed that the reason for the TAWS Display On-Off switch was to be able to choose between the radar display and the TAWS display when both may have been required. In our ops, at least one pilot had to have TAWS ON in designated mountainous terrain - so if radar was also required, the TAWS switch was ON for one ND and OFF for the other. If the TAWS system had a warning, both NDs displayed the warning and the terrain ahead.

Of course, the question is, was the TAWS turned off on this flight, and if not, what did the TAWS do just prior to impact? Were there warnings - how soon - was there a response from the crew?

Google-Earth images deleted due updated data.

PJ2

Last edited by PJ2; 11th May 2012 at 15:04.
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