90-13-01 R1: Tail Rotor Blade Assembly

90-13-01 R1 BELL HELICOPTER TEXTRON, INC. (BHTI): Amendment 39-8034. Docket No. 90-ASW-35. Final rule of priority letter AD. Applicability: Model 206B, 206L, 206L-1, and 206L-3 helicopters, all serial numbers, certificated in any category. Compliance: Required before further flight, unless already accomplished. To prevent failure of a tail rotor blade assembly, which could result in loss of control of the tail rotor, accomplish the following: (a) Determine the part number and serial number of the tail rotor blade assembly installed on the helicopter. (b) If the tail rotor blade assembly installed is P/N 206-016-201-113 or P/N 206- 016-201-127 and is identified with any serial number listed below, remove and replace the blade assembly with an airworthy part before further flight: T-41361 T-41627 T-41725 T-41737 T-42088 T-42127 T-42157 T-42307 T-42311 T-42316 T-42494 T-42496 T-42497 T-42502 T-42523 T-42534 T-43276 T-44089 T-44120 T-44157 T-44174 Serial Numbers: T-44222 T-44300 T-44638 (c) If one of the tail rotor blade assemblies listed in paragraph (b) is found, report the helicopter registration, serial number, and tail rotor blade assembly serial number to the Manager, Rotorcraft Certification Office, ASW-170, Federal Aviation Administration, Fort Worth, Texas, 76193-0170, telephone (817) 624-5170, within 10 days of the inspection. (Reporting approved by the Office of Management and Budget under OMB No. 2120-0056.) (d) In accordance with FAR Sections 21.197 and 21.199, the helicopter may be flown to a base where the tail rotor blade assembly replacement may be accomplished. NOTE: Any unairworthy blade assemblies found as a result of (b) of this AD should be permanently marked as unairworthy. (e) Record compliance with paragraph (b) of this AD in the AD compliance record and in the maintenance record of the helicopter log book. This record must include the serial numbers of any deficient blade assembly found during compliance with this AD. (f) An alternate method of compliance which provides an equivalent level of safety, may be used if approved by the Manager, Rotorcraft Certification Office, Southwest Region, Federal Aviation Administration, Fort Worth, Texas 76193-0170, telephone (817) 624-5170. This amendment (39-8034, AD 90-13-01 R1) becomes effective on October 17, 1991, as to all persons except those persons to whom it was made immediately effective by Priority Letter AD's 90-13-01 and 90-13-01 R1, issued June 14 and June 22, 1990, which contained this amendment.