AD 92-15-11

92-15-11 PRATT & WHITNEY CANADA: Amendment 39-8305. Docket No. 91-ANE-06. Applicability: Pratt & Whitney Canada (PWC) PT6A-6, PT6A-6/C20, PT6A-20, PT6A-20A, PT6A-21, PT6A-27, PT6A-28, PT6A-34, PT6A-34B, and PT6A-36 turboprop engines installed on Beech Aircraft Corporation Models 65-90, 65-A90, 65-A90-1, 65-A90-2, 65-A90-3, 65-A90-4, 99, 100, 99A, B90, C90, C90A, E90, H90, A99, A99A, B99, and C99 aircraft. Compliance: Required within the next 180 days after the effective date of this AD, unless accomplished previously. To prevent excessive engine acceleration time that could result in an aircraft's inability to safely perform the balked landing maneuver required by Federal Aviation Regulations (FAR) part 23, paragraphs 23.75(d), 23.77 and 23.143(a)(5), accomplish the following: (a) Perform a visual inspection to determine if a compressor delivery air line (P3) filter assembly has been installed on the engine. NOTE: The compressor delivery air line assembly may have been installed on the engine as original equipment, or may have been installed per any of the following PWC Service Bulletins: 1205, 1253, 1290, 1294, 1330, 1343, or 1378. (b) Remove from service, if installed, the P3 filter assembly. NOTE: The engine compressor delivery air line assembly can be returned to an approved configuration without a P3 filter. For information, refer to the applicable PWC Maintenance Manual and Parts Catalog. (c) 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, Engine Certification Office, FAA, Engine and Propeller Directorate. The request should be forwarded through an FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Engine Certification Office. NOTE: Information concerning the existence of approved alternative methods of compliance with this airworthiness directive, if any, may be obtained fromthe Engine Certification Office. (d) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished. (e) This amendment becomes effective on August 17, 1992.