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Butler Avionics Offers Rockwell Collins AHRS Retrofit for Learjet 60

By Juliet Van Wagenen | July 30, 2015
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Learjet 60 cockpit, rendering
Learjet 60 cockpit, rendering. Photo: Bombardier

[Avionics Today 07-30-2015] Maintenance, Repair and Overhaul (MRO) company Butler National Corporation’s subsidiary Avcon Industries has received FAA approval to install the Rockwell Collins AHC-3000A Attitude Heading Reference System (AHRS) into the Learjet Model 60. The Supplemental Type Certificate (STC) retrofit package will be offered through Butler National’s subsidiary Butler Avionics.

Learjet has partnered with Butler National to resolve an AHRS hardware obsolescence problem with the Rockwell Collins AHC-85 AHRS computer.
The STC allows retrofits of the AHC-85 computer with the AHC-3000A computer and installs the new External Compensation Unit (ECU), the ECU-3000. The STC allows the two computer AHRS system to be replaced one computer at a time. Additionally, the AHC-3000A retrofit looks to simplify AHRS set up and calibration with most of the calibration activity completed in the cockpit.

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