AIEC Switzerland’s program to install a Universal Avionics (UA) AHS-525 Attitude Heading Reference System (AHRS) on at least two Learjet 35 aircraft is now underway. The engineering firm will perform the installation and EASA/FAA Supplemental Type Certificate (STC) at the operator’s base in North Germany.
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. This enhanced functionality allows a single AHS-525 to replace multiple Line Replaceable Units (LRU) found in a typical aircraft installation that would be performing the same functions. As a result, there is a reduction in the LRU footprint, weight, wiring and power requirements. The unit is 7.5 pounds (3.4 kilograms), including the fixed mounting plate, which provides for more efficient serviceability whereby the aircraft is not required to perform repeated realignment and calibration.
