Airworthiness Directives; The Cessna Aircraft Company Model 525 (CitationJet 1) Airplanes

This amendment adopts a new airworthiness directive (AD) that applies to certain The Cessna Aircraft Company (Cessna) Model 525 (CitationJet 1) airplanes. This AD requires you to replace certain direct current (DC) power battery switches. This AD is the result of reports of the potential for a certain 8-pole battery switch to fail during flight. The actions specified by this AD are intended to prevent this battery switch from failing while the airplane is in-flight, which is a latent failure. This could result in the pilot's inability to select "EMER" power or the inability to disconnect an overheated main ship's battery. On a battery overheat indication, the Airplane Flight Manual (AFM) instructs the pilot to disconnect the battery and, if the problem cannot be fixed, the pilot should immediately land the airplane. The main ship's battery that remains powered in an overheated condition may become hot enough to damage adjacent components and structure and may interfere with continued flight and a safe landing.