In forward flight above 80 KIAS, the torque limit when the AFCS is coupled to the FD is:

• A. 83%
• B. 95%
• C. 75%
• D. 60%

Answer: (A)

In this situation the system uses a specific engine torque envelope that depends on airspeed and whether the automatic flight control system is guiding the aircraft via the flight director. When you’re in forward flight above 80 KIAS and the AFCS is coupled to the flight director, the torque limit is set to 83 percent. This value is chosen to give the flight director enough authority to track commands without allowing torque to approach engine or drivetrain limits under dynamic high-speed conditions. If the limit were much higher, you’d risk over-torque during gusts or aggressive FD commands; if it were much lower, the autopilot could struggle to follow the flight director smoothly at those speeds. So 83 percent is the appropriate balance for that specific configuration.