TURN COORDINATOR  2 MIN.  D.C.  ELEC.  L R  NO PITCH  INFORMATION  The function of an AHRS is the same as gyroscopic systems;  that is, to determine which way is level and which way is  north. By knowing the initial heading the AHRS can determine  both the attitude and magnetic heading of the aircraft.  The genesis of this system was initiated by the development  of the ring-LASAR gyroscope developed by Kearfott located  in Little Falls, New Jersey.  [Figure 5-36]  Their development  of the Ring-LASAR gyroscope in the 1960s/1970s was  in support of Department of Defense (DOD) programs to  include cruise missile technology. With the precision of  these gyroscopes, it became readily apparent that they could  be leveraged for multiple tasks and functions. Gyroscopic  miniaturization has become so common that solid-state  gyroscopes are found in products from robotics to toys. Because the AHRS system replaces separate gyroscopes,  such as those associated with an attitude indicator, magnetic  heading indicator and turn indicator these individual systems  are no longer needed. As with many systems today, AHRS  itself had matured with time. Early AHRS systems used  expensive inertial sensors and flux valves. However, today the  AHRS for aviation and general aviation in particular are small  solid-state systems integrating a variety of technology such  as low cost inertial sensors, rate gyros, and magnetometers,  and have capability for satellite signal reception. An Air Data Computer (ADC)  [Figure 5-37]  is an aircraft  computer that receives and processes pitot pressure, static  Air Data Computer (ADC) Flight Support Systems Attitude and Heading Reference System (AHRS) As aircraft displays have transitioned to new technology,  the sensors that feed them have also undergone significant  change. Traditional gyroscopic flight instruments have  been replaced by Attitude and Heading Reference Systems  (AHRS) improving reliability and thereby reducing cost and  maintenance.  inside of the turn. A turn coordinator does not sense pitch.  This is indicated on some instruments by placing the words  “NO PITCH INFORMATION” on the dial. Figure 3-35. A turn coordinator senses rotation about  Figure 5-35. A turn coordinator senses rotation about both roll  and yaw axes. Figure 5-36. The Kearfott Attitude Heading Reference System (AHRS) on the left incorporates a Monolithic Ring Laser Gyro (MRLG)  (center), which is housed in an Inertial Sensor Assembly (ISA) on the right. 5-22