Which factors are included in MRTW calculations?

• A. Runway length, climb/obstacle clearance, break energy, tire speed, AFM structural limits, en-route engine failure (drift down), landing runway length, and go around
• B. Outside air temperature and winds only
• C. Airspeed indicator accuracy and altimeter settings
• D. Crew workload and weather radar availability

Answer: (A)

MRTW calculations evaluate the aircraft’s ability to operate safely within the available runway and performance envelope across takeoff, landing, and potential contingencies. This means considering the actual runway data and how the airplane can perform from brake to climb, including the limits that protect structural integrity and safe deceleration. Runway length sets the baseline for whether there is enough distance to lift off or stop after landing. Climb and obstacle clearance address how the airplane can safely ascend and avoid obstacles during the initial phase after takeoff. Break energy and tire speed relate to how much braking and deceleration the wheels and tires can handle without overloading the braking system or tire limits. AFM structural limits ensure the flight stays within the aircraft’s certified capabilities in terms of speeds and loads. An en-route engine failure with drift down explores a realistic failure scenario and shows the required speed and performance to continue safely. Landing runway length is the specific constraint for landing, showing whether the aircraft can stop within available distance. Finally, the go-around option represents a planned safe transition if the approach isn’t achieving required parameters.

Other factors like outside air temperature and winds influence performance but don’t by themselves define the MRTW envelope. Instrument accuracy and altimeter settings affect flight data, not the fundamental performance feasibility. Crew workload and weather radar availability are crew-resource and situational factors, not direct performance constraints.