What provides the FCCs with pitch rate information for the Stabilator?

What provides the FCCs with pitch rate information for the Stabilator?

• A. EGIs
• B. Radar Altimeter
• C. GPS
• D. VSI

Answer: (A)

Pitch rate is the angular rate about the helicopter’s lateral axis, and the Stabilator’s control loop relies on that rate data to command stabilator deflections for proper pitch damping and control. The EGIs provide the inertial data stream from the gyros, delivering accurate angular-rate information (including pitch rate) to the flight control computers. This lets the FCCs know exactly how fast the aircraft is pitching so they can adjust the stabilator accordingly. The radar altimeter only gives altitude, GPS mainly provides position and velocity (not angular rate), and the VSI indicates vertical speed, not rotational rate. So the EGI is the source that supplies the required pitch-rate data.

Pitch rate is the angular rate about the helicopter’s lateral axis, and the Stabilator’s control loop relies on that rate data to command stabilator deflections for proper pitch damping and control. The EGIs provide the inertial data stream from the gyros, delivering accurate angular-rate information (including pitch rate) to the flight control computers. This lets the FCCs know exactly how fast the aircraft is pitching so they can adjust the stabilator accordingly. The radar altimeter only gives altitude, GPS mainly provides position and velocity (not angular rate), and the VSI indicates vertical speed, not rotational rate. So the EGI is the source that supplies the required pitch-rate data.