Which two facts correctly describe the IAS-to-Mach transition and the autoflight bank transition?

Which two facts correctly describe the IAS-to-Mach transition and the autoflight bank transition?

• A. FL316; 1/2 bank
• B. FL320; 1/4 bank
• C. FL316; Full bank
• D. FL300; 0 bank

Answer: (A)

The timing and control idea here is about what the autopilot uses for speed reference and how it handles the transition into stable cruise. At high altitude, switching from indicated airspeed to Mach number as the speed reference keeps speed management consistent as air density thins and compressibility effects grow. In this scenario, the IAS-to-Mach transition happens at Flight Level 316, which is about 31,600 feet; above this, Mach becomes the primary reference for speed. For the autoflight bank transition, the system uses a moderate bank angle during the transition phase to avoid abrupt changes. Half bank (about 15 degrees) provides a gentle, controlled transition into the new cruise state without overshooting altitude or speed, unlike a full bank which can cause a larger, more abrupt turn, or zero bank which can slow the transition and make it less stable. So the correct combination is Flight Level 316 with a half-bank transition.

The timing and control idea here is about what the autopilot uses for speed reference and how it handles the transition into stable cruise. At high altitude, switching from indicated airspeed to Mach number as the speed reference keeps speed management consistent as air density thins and compressibility effects grow. In this scenario, the IAS-to-Mach transition happens at Flight Level 316, which is about 31,600 feet; above this, Mach becomes the primary reference for speed.

For the autoflight bank transition, the system uses a moderate bank angle during the transition phase to avoid abrupt changes. Half bank (about 15 degrees) provides a gentle, controlled transition into the new cruise state without overshooting altitude or speed, unlike a full bank which can cause a larger, more abrupt turn, or zero bank which can slow the transition and make it less stable.

So the correct combination is Flight Level 316 with a half-bank transition.