Summary
This document proposes to adopt a new airworthiness directive (AD) that would apply to Raytheon Aircraft Company (Raytheon) Models 1900D airplanes (formerly known as Beech Aircraft Corporation Models 1900D airplanes). The proposed action would require inspecting and repairing the radio switching panel relay printed circuit board (PCB) and the nose avionics wire harnesses, and replacing the existing A017 component PCB with a new A017 component PCB that has internal overcurrent protection fuses. Several reported incidents of lost pilot/ co-pilot intercom ability, VHF communication ability, and public address system ability while in flight prompted the proposed action. The actions specified by the proposed AD are intended to prevent the loss of the pilot and co-pilot intercom, VHF communications, and passenger address system, which could result in loss of all communication during critical phases of flight.