Airworthiness Directives; Cessna Model 750 Citation X Series Airplanes

This amendment rescinds Airworthiness Directive (AD) 98-16-17 R1, which is applicable to all Cessna Model 750 Citation X series airplanes. That AD requires repetitive in-flight functional tests to verify proper operation of the secondary horizontal stabilizer pitch trim system, and repair if necessary. The requirements of that AD were intended to detect and correct contamination and damage in the system actuator, which could result in simultaneous failure of both primary and secondary pitch trim systems, and consequent reduced controllability of the airplane. Since the issuance of that AD, an improved part has been developed, which, if installed, would terminate the repetitive tests; that improved part has been installed on all affected airplanes or is being installed in production. Therefore, the identified unsafe condition no longer exists.