What do you do if you need to monitor a number of audio signals, but you don't have room for an audio switching panel? Jim Weir finds the answer in a summing amplifier.
AeroTek Aviations Beaver-size amphibious kit airplane, the Grizzly, showcases the company's 550-shaft-horsepower Pratt & Whitney PT6A engine conversion, which has also flown in the Murphy Moose. By Ed Wischmeyer.