What’s the criteria of unstable approach used by ATR in the presentation? (The 12% flights over certain speed variation? -1200fpm? Bank?)
The criteria used is the stabilization criteria provided in the FCTM (path, speed, power, configuration). Please refer to FCTM Chapter 25.2.
Is v/s the highest risk factor in CFIT prevention? What about Vapp adherence or bank?
Lack of visual reference, unstabilized approach and high descent rate at low altitudes are three significant contributing factors identified in the CFIT events in the ATR fleet and in the industry. Vapp adherence and bank are part of the stabilized approach criteria and are therefore taken into account.
How many ATR operators use FDM? Percentage.
ATR does not have specific numbers. When we began to promote FDM (2016) we estimated approximately 50 percent of operators engaged an FDM supplier. However, we stress the need to incorporate FDM in your safety management system. Hence the real question is how many operators are maximizing the use of FDM to increase their safety margins. We highlight in a number of recent investigations some of the precursors were evident in the FDM data.
Approach and Landing - Prevention of CFIT on Approach.pdf