AD 97-01-05 Airworthiness Directives; Williams International, L.L.C. Model FJ44-1A Turbofan Engines

Makes named: cessna. Models named: FJ44-1A turbofan, 525. Read the applicability below — it usually turns on serial or part numbers too.

Williams International L.L.C. Model FJ44-1A turbofan engines, with serial numbers 1001-1179, 1196, and 1197, installed on, but not limited to, Cessna Citation Model 525 aircraft. Note 1: This airworthiness directive (AD) applies to each engine 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 engines 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 (c) 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 prevent possible high pressure turbine (HPT) disk blade retention post separations and the release of their retained turbine blades, subsequent loss of engine power, and possible high disk speed uncontained liberation of disk posts and the turbine blades, which could cause aircraft damage, accomplish the following: (a) Perform initial and repetitive eddy current inspections (ECI) for cracks in HPT disks, Part Number (P/N) 48629, blade retention posts in accordance with the following schedule and requirements: ------------------------------------------------------------------------ Repetitive Engine serial Nos. Initial compliance inspection required required ------------------------------------------------------------------------ 1001, 1004-1010, 1016, 1017, Within 50 cycles Thereafter, at 1020, 1023-1026, 1031, 1033, after the intervals not to 1036, 1039, 1041, 1042, 1043, effective date of exceed 125 cycles 1046-1048, 1051-1056, 1063, this AD or by in service (CIS) 1069, 1071, 1072, 1076, 1080, February 1, 1997, since last 1082, 1091, 1092, 1095-1098, whichever occurs inspection. 1107, 1108, 1111, 1125, 1127- first. 1129, 1133, 1134, 1165, 1172, 1178 Remaining serial number engines No later than May Thereafter, at with 575 CIS or more as of 1, 1997. intervals not to April 1, 1997 exceed 125 CIS since last inspection. ------------------------------------------------------------------------ (1) Perform the initial and repetitive eddy current inspections for cracks in HPT disk blade retention posts in accordance with Williams-Rolls Alert Service Bulletin (ASB) No. FJ44-A72-30, dated November 6, 1996. (2) Remove from service HPT disks that do not meet the ``return to service'' criteria stated in Williams-Rolls ASB No. FJ44-A72-30, dated November 6, 1996, and replace them with serviceable HPT disks, P/N 48629, that meet the required ASB ``return to service'' criteria, or replace them with advanced design HPT disks, P/N 55291, in accordance with paragraph (b) of this AD. (b) No later than July 1, 1997, replace all existing HPT disks, P/N 48629, with advanced design HPT disks, P/N 55291, in accordance with Williams-Rolls ASB No. FJ44-A72-31, dated November 4, 1996. Installation of this advanced design HPT disk constitutes terminating action to the repetitive inspection requirements of this AD. (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, Chicago Aircraft Certification Office. The request should be forwarded through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Chicago Aircraft Certification Office. Note 2: Information concerning the existence of approved alternative methods of compliance with this airworthiness directive, if any, may be obtained from the Chicago Aircraft Certification Office. (d) 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 aircraft to a location where the requirements of this AD can be accomplished. (e) The actions required by this AD shall be done in accordance with the following Williams-Rolls ASBs: ------------------------------------------------------------------------ Document No. Pages Date ------------------------------------------------------------------------ FJ44-A72-30........................... 1-7 November 6, 1996. Total pages: 7 FJ44-A72-31........................... 1-7 November 4, 1996. Total pages: 7 ------------------------------------------------------------------------ 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 Mr. John Teeter, Manager, Customer Support, Williams International, 2280 West Maple Road, P.O. Box 200, Walled Lake, MI 48390-0200; telephone (810) 624-5200, fax (810) 669-9515. Copies may be inspected at the FAA, New England Region, Office of the Assistant Chief Counsel, 12 New England Executive Park, Burlington, MA; or at the Office of the Federal Register, 800 North [[Page 602]] Capitol Street, NW., suite 700, Washington, DC. (f) This amendment becomes effective on January 21, 1997. Issued in Burlington, Massachusetts, on December 27, 1996. Jay J. Pardee, Manager, Engine and Propeller Directorate, Aircraft Certification Service. [FR Doc. 97-31 Filed 1-3-97; 8:45 am] BILLING CODE 4910-13-U