Butler National Corporation has received FAA Supplemental Type Certificate (STC) approval of the CHRONOS digital clock that includes USB-A and USB-C chargers on Learjet Model 24, 24B/D/E/F, 25, 25B/C/D/F, 28, 29, 31, 31A, 35, 35A, C21A, 36, 36A, 55, 55B, 55C, 60, and 60XR airplanes.
The STC authorizes the replacement of the existing OEM-installed clocks with the Avcon Industries/ Butler Avionics designed installation of the Mid-Continent Instruments and Avionics CH93 Series CHRONOS Digital Clocks with USB chargers.
The installation fits within the same panel location and requires only circuit breaker and wiring changes, according to Mid-Continent Instruments and Avionics officials.
For more information: MCICO.com, ButlerNational.com