AD 98-16-17 Airworthiness Directives; Cessna Model 750 Citation X Series Airplanes

Makes named: cessna. Models named: 750 Citation X series. Read the applicability below — it usually turns on serial or part numbers too.

All Model 750 Citation X series airplanes, certificated in any category. Note 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For airplanes that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (b) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.

Required as indicated, unless accomplished previously. To detect and correct internal water contamination and corrosion damage of the secondary horizontal stabilizer trim actuator, which could result in simultaneous failure of both primary and secondary pitch trim systems, and consequent reduced controllability of the airplane, accomplish the following: (a) Within 10 days after the effective date of this AD, perform an in-flight functional test to verify proper operation of the secondary horizontal stabilizer pitch trim system, in accordance with Cessna Alert Service Bulletin ASB750-27-22, dated July 2, 1998. (1) If the secondary trim system does not fail during the in- flight functional test, repeat the action thereafter at intervals not to exceed 30 days. (2) If the secondary trim system fails during the in-flight functional test, prior to next flight, inspect the actuator components and clutch assemblies for evidence of internal water contamination or corrosion damage in accordance with the alert service bulletin. If any evidence of internal water contamination or corrosion damage is detected, prior to further flight, repair in accordance with the alert service bulletin. Repeat the in-flight functional test thereafter at intervals not to exceed 30 days. (b) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Wichita Aircraft Certification Office (ACO), FAA, Small Airplane Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Wichita ACO. Note 2: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Wichita ACO. (c) Special flight permits may be issued in accordance with sections 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the airplane to a location where the requirements of this AD can be accomplished. (d) The actions shall be done in accordance with Cessna Alert Service Bulletin ASB750-27-22, dated July 2, 1998. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from Cessna Aircraft Co., P.O. Box 7706, Wichita, Kansas 67277. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the FAA, Small Airplane Directorate, Wichita Aircraft Certification Office, 1801 Airport Road, Room 100, Mid-Continent Airport, Wichita, Kansas; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (e) This amendment becomes effective on August 24, 1998. Issued in Renton, Washington, on July 29, 1998. Darrell M. Pederson, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 98-20836 Filed 8-6-98; 8:45 am] BILLING CODE 4910-13-U