Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Cessna Model 750 airplanes. This proposal would require replacement of reset circuit breakers for the auxiliary hydraulic pump system and the King KHF 950 high frequency communication system(s) with new circuit breakers. This proposal is prompted by a report from the airplane manufacturer indicating that the trip levels for the reset circuit breakers installed in the auxiliary hydraulic pump system and the King KHF 950 high frequency system(s) are too high, which can prevent corresponding high current remote control circuit breakers from tripping when excessive electrical loads are present. The actions specified by the proposed AD are intended to prevent overloading of the affected airplane electrical wiring and circuits, which could result in a fire.