AD 98-21-14 Amendment 39-10823

This amendment adopts a new airworthiness directive (AD) that applies to certain British Aerospace Jetstream Model 3101 airplanes. This AD requires modifying the airplane's navigational system by shortening and re-clipping the cable looms to the No. 1 and No. 2 vertical gyroscopes, installing a warning label adjacent to the gyroscopes, and performing an operational check on the system. This AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for the United Kingdom. The actions specified by this AD are intended to prevent a cross connection in the No. 1 and No. 2 vertical gyroscopes, which could result in navigational errors during flight.