Story ID: 
Butler National Updates Learjet Standby Instruments
By: Matt Thurber
Caption: The upgrade will be available to avionics shops for installation in customer Learjets
Word Count: 218
The FAA has issued a supplemental type certificate to Butler National for the installation of Mid-Continent Instruments and Avionics’ replacement two-inch standby altimeter and attitude indicator in Learjet Models 23 through 60.
According to Mid-Continent, the approval allows for the replacement of one or both of the two-inch standby altimeters or two-inch standby attitude indicators installed in most Learjets. The Mid-Continent Digital Attitude Indicator and Counter Drum Encoding Altimeter have liquid-crystal displays and are more reliable than the mechanically-driven instruments they replace.
“Customers can cost-effectively install our two-inch digital attitude indicator and counter drum encoding altimeter in their aircraft. In most installations, there’s no need to cut the panel and minimal bus or wiring changes are required,” said Mid-Continent v-p of marketing and aftermarket sales Van Winter. “This upgrade is a great, modern addition to the cockpit, providing smooth, high-resolution graphics and advanced functionality.”
“Our avionics technicians have noticed a growing number of operating challenges with existing RVSM standby altimeters when performing the required continued airworthiness checks,” noted Butler National president and CEO Chris Reedy. “The replacement standby altimeter is a quality and cost-effective replacement solution that provides the RVSM standby functionality. Similarly, the MD23 two-inch digital attitude indicator provides a great-looking LCD-display replacement for the aging mechanical standby attitude indicator.”