A proposal to amend part 39 of the Federal Aviation Regulations (14 CFR part 39) to include an airworthiness directive (AD) that is applicable to all Cessna Model 750 Citation X series airplanes was published in the Federal Register on January 7, 2000 (65 FR 1075). That action proposed to rescind AD 98-16-17, amendment 39-10693 (63 FR 42206, August 13, 1999), which currently requires repetitive in-flight functional tests of the secondary horizontal stabilizer pitch trim system, and repair if necessary.\n\nComments\n\n\tWe provided the public the opportunity to participate in the development of this AD. We received no comments on the proposed rescission.\n\nConclusion\n\n\tWe have carefully reviewed the available data and determined that air safety and the public interest require rescinding the AD as proposed.\n\nFAA's Determination\n\n\tSince AD 98-16-17 was issued, an improved part has been developed. Installation of that part terminates the repetitive tests required by the existing AD. The FAA has been advised that the improved part has been installed on all affected airplanes or will be installed in production. The FAA has determined that the previous part number is no longer available or allowed to be installed. Therefore, the identified unsafe condition no longer exists, and we have determined that it is necessary to rescind AD 98-16-17 to prevent operators from performing unnecessary actions.\n\nThe Rescission\n\n\tAccordingly, pursuant to the authority delegated to me by the Administrator, the Federal Aviation Administration amends part 39 of the Federal Aviation Regulations (14 CFR part 39) as follows:\n\nPART 39-AIRWORTHINESS DIRECTIVES\n\n1. The authority citation for part 39 continues to read as follows:\n\n\tAuthority: 49 U.S.C. 106(g), 40113, 44701.\n\n§ 39.13 (Amended)\n\n\t2. Section 39.13 is amended by adding an AD which removes amendment 39-10693, to read as follows: