The FAA has granted Technical Standard Order (TSO) authorization for Universal Avionics AHS-525 Attitude Heading Reference System (AHRS).
The AHS-525 is positioned as a low-cost option for replacing legacy mechanical VGs and DGs in Part 23 and Part 25 fixed wing aircraft, and Part 27 and Part 29 rotorcraft, according to company officials.
The AHS-525 contains multiple rate gyros to measure angular aircraft motion in the pitch, roll and yaw axes, and several accelerometers to measure aircraft linear motion along the longitudinal, lateral and vertical axes of the aircraft, company officials report, adding it is a cost-effective solution for replacing fragile mechanical “spinning” gyroscopes.
A single AHS-525 provides an opportunity to replace multiple Line Replaceable Units (LRU) found in a typical aircraft installation. The stand-alone AHS-525 offers Micro-Electromechanical (MEMS) technology that has all of the advantages of reliable solid-state technology, along with ease of alignment procedures, a compact and lightweight size, and increased reliability over VGs and DGs.