Regulation & law · 05/11/2001

Rockwell Collins to Modify TDR-94 and TDR-94D Mode S Transponders to Prevent Erroneous Altitude Reporting

The Federal Aviation Administration proposes a new airworthiness directive to modify Rockwell Collins TDR-94 and TDR-94D Mode S transponders that derive altitude information from a Gillham encoded pressure altitude source, installed on certain airplanes, to prevent erroneous altitude reporting that could impact air traffic control and pilot decisions.