United States Government Publishing Office publisher pbl distributor dst United States National Archives and Records Administration Office of the Federal Register author aut Government Organization text government publication eng FR Regulatory Information 1997_register executive 2010-09-24 article Rules and Regulations D09002ee1be026fd4 D09002ee1be02703c United States Department of Transportation originator org United States Government Agency or Subagency United States Federal Aviation Administration originator org United States Government Agency or Subagency This amendment adopts a new airworthiness directive (AD) that is applicable to Williams International, L.L.C. Model FJ44-1A turbofan engines. This action requires initial and repetitive eddy current inspections (ECI) for possible cracks in high pressure turbine (HPT) disk blade retention posts. In addition, this AD requires the installation of advanced design HPT disks as terminating action to the inspection requirements of this AD. This amendment is prompted by two incidents of HPT disk blade retention post separations. The actions specified in this AD are intended to locate possible cracks in HPT disk blade retention posts, thereby preventing the separation of these posts and the liberation of the turbine blades that they retain, and a subsequent loss of engine power. In addition, the actions specified in this AD are intended to prevent the possible high disk speed uncontained liberation of disk posts and turbine blades, which could cause aircraft damage. 62 FR 600 https://www.govinfo.gov/app/details/FR-1997-01-06/97-31 97-31 fr06ja97-3 RIN 2120-AA64 4910-13-U Docket No. 96-ANE-39 Amendment 39-9875 AD 97-01-05 https://www.govinfo.gov/app/details/FR-1997-01-06/97-31 https://www.govinfo.gov/content/pkg/FR-1997-01-06/html/97-31.htm https://www.govinfo.gov/content/pkg/FR-1997-01-06/pdf/97-31.pdf 3 p. 600 602 62 FR 600 Title 14 Part 39 14 CFR Part 39 RIN 2120-AA64 Airworthiness Directives; Williams International, L.L.C. Model FJ44-1A Turbofan Engines; Federal Register Vol. 62, Issue RULE 97-31 DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 1997-01-21 Docket No. 96-ANE-39 Amendment 39-9875 AD 97-01-05 4910-13-U 97-31 Final rule; request for comments.

This amendment adopts a new airworthiness directive (AD) that is applicable to Williams International, L.L.C. Model FJ44-1A turbofan engines. This action requires initial and repetitive eddy current inspections (ECI) for possible cracks in high pressure turbine (HPT) disk blade retention posts. In addition, this AD requires the installation of advanced design HPT disks as terminating action to the inspection requirements of this AD. This amendment is prompted by two incidents of HPT disk blade retention post separations. The actions specified in this AD are intended to locate possible cracks in HPT disk blade retention posts, thereby preventing the separation of these posts and the liberation of the turbine blades that they retain, and a subsequent loss of engine power. In addition, the actions specified in this AD are intended to prevent the possible high disk speed uncontained liberation of disk posts and turbine blades, which could cause aircraft damage.

Effective January 21, 1997. Eugene H. Messal, Aerospace Engineer, Chicago Aircraft Certification Office, FAA, Small Airplane Directorate, 2300 East Devon Avenue, Des Plaines, Illinois 60018; telephone (847) 294-7011, fax (847) 294-7834. Vol. 62, no. 3 Office of the Federal Register, National Archives and Records Administration 1997-01-06 continuing daily deposited born digital 310 p. Table of Contents: AE 2.7: GS 4.107: AE 2.106: KF70.A2 https://www.govinfo.gov/app/details/FR-1997-01-06 P0b002ee180a37936 0097-6326 0042-1219 0364-1406 769-004-00000-9 000582072 f:fr06ja97 https://www.govinfo.gov/app/details/FR-1997-01-06 https://www.govinfo.gov/content/pkg/FR-1997-01-06/pdf/FR-1997-01-06.pdf fdlp 593 888 DGPO 2010-09-24 2023-05-06 FR-1997-01-06 machine generated eng FR FR-1997-01-06 62 3