What do AHRS 1 and AHRS 2 provide?

• A. Pitch and roll angles, heading, VSI
• B. Airspeed, Pitch and roll angles, heading
• C. Angular rates, Airspeed, VSI
• D. Heading, Pitch and roll angles, angular rates

Answer: (D)

The correct choice identifies the primary functions of the Attitude and Heading Reference Systems (AHRS) in the TH-73A. AHRS 1 and AHRS 2 are critical components that provide essential flight data, which includes pitch and roll angles, heading, and angular rates.

Pitch and roll angles are necessary for understanding the aircraft's orientation in space, directly influencing flight control. The heading is crucial for navigation, helping to keep the aircraft on its intended course. Angular rates give insight into how quickly the aircraft is rotating around its axes, aiding pilots in maintaining control and stability during maneuvers. These functionalities are vital for both navigation and the overall safety of flight operations.

Other options include various combinations of flight data but omit some critical elements or introduce irrelevant information like VSI (Vertical Speed Indicator) and airspeed, which are not provided directly by the AHRS. By focusing on heading, pitch, roll, and angular rates, the correct answer encapsulates the core mission of AHRS systems in supporting the pilot with accurate and timely data during flight.