Advanced Descent

An Advanced Descent performance model is comprised of a set of parameters that define the flight characteristics of the aircraft while descending and is mapped to the physical properties of the aircraft that are currently defined in the Advanced Fixed Wing Tool.

Descent

Field	Description
Descent Airspeed	Select a mode to calculate the aircraft's airspeed while descending. Max Range Cruise Speed - a variable airspeed that maximizes the distance that the aircraft can fly. Best Glide Ratio - the speed at which the aircraft's glide ratio is maximized. Min Sink Rate - the speed at which the aircraft's rate of descent is minimized. Stall Speed Ratio - a speed relative to the aircraft's stall speed. Override Airspeed - a specific, manually defined speed.
Stall Speed Ratio	Defines the Stall Speed Ratio upon leaving the ground; this property is calculated if the Speed Mode is set to Angle of Attack or manually defined if it is set to Stall Speed Ratio.
Airspeed	Defines the aircraft's airspeed; this property is calculated unless you have selected Override Airspeed for the Descent Airspeed property.
Speedbrakes	Defines the extension of the speedbrakes during the landing.

Airspeed Limit Below Alt

Airspeed Limit Below Alt parameters are used to specify an airspeed limit when the aircraft is below a specified altitude. This limit represents a flight regulation (the default value is the limit proscribed by the FAA) and is not related to the actual performance capabilities of the aircraft.

Table - Airspeed Limit Below Alt

Field	Description
Use Airspeed Limit	Select to apply an altitude airspeed limit on the aircraft.
Altitude Limit	Defines the altitude threshold, below which the airspeed limit will be applied.
Airspeed	Defines the aircraft's maximum airspeed when below the Altitude Limit; select a reference from the drop-down menu - true airspeed (TAS), calibrated airspeed (CAS), equivalent airspeed (EAS), or Mach number.

Compute Delta Altitude

The Compute Delta Altitude property defines the maximum change in altitude in a computed segment before the data is sampled again and a new segment is begun.