AD/AL 250/58 Amdt 2 - Gearbox Assembly - PTO Helical Gearshaft Assembly - Replacement

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Allison Turbine Engines - 250 Series

AD/AL 250/58

Amdt 2

Gearbox Assembly - PTO Helical Gearshaft Assembly - Replacement

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Applicability: All Model 250-C18, C20, C20B, C20F, B15G, B17, B17B, and B17C, engines with exceptions as listed in the requirement document.

Requirement: Allison 250-C18, C18A, C18B, C18C

Allison 250-C20, C20B, C20F

Allison 250-B15G

Allison 250-B17, B17B, B17C

: CEB-203

: CEB-1150

: TP CEB-71

: TP CEB-1126

Rev. 7

Rev. 7

Rev. 7

Rev. 7

Compliance: In accordance with the Requirement Document Para E.

Background: This Directive is amended to reflect the manufacturers Rev. 7 changes to the Requirement Documents Para 1.E Compliance Statement; sub-para 3 which requires the immediate replacement of superseded part numbered PTO shaft in the event of future shockload or sudden stoppage as defined in Para 3.1 and 3.2.