AD/AL 250/64 Amdt 4 Internal Energy Absorbing Ring (Cth)

AIRWORTHINESS DIRECTIVE On the commencement date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below repeals Airworthiness Directive (AD) AD/AL 250/64 Amdt 3 and issues the following AD under subregulation 39.001 (1) of CASR and subsection 33 (3) of the Acts Interpretation Act 1901. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct an unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

Rolls Royce (Allison) Turbine Engines - 250 Series AD/AL 250/64 Amdt 4 Internal Energy Absorbing Ring 20/2021

Applicability: Rolls Royce (Allison) model 250-C30, 250-C30L, 250-C30M, 250-C30P, and 250‑C30S engines. Requirement: Install an internal energy absorbing ring in accordance with Rolls Royce (Allison) Alert Service Bulletin (ASB) CEB-A-72-3128 R1, Para 2 Accomplishment Instructions, as in force on the date of commencement of this AD. Note 1: This AD may be carried out in conjunction with AD/AL 250/66 Amdt 3. Note 2: United States of America Federal Aviation Administration (FAA) AD 86‑19‑12 is the basis for this AD. Compliance: Unless previously accomplished within 30 days after the commencement date of this AD. This AD commences on 8 October 2021. Background: Amendment 3 of this AD was amended to rationalize previous requirements, and to increase the engine models and aircraft applicable. The Requirements now require the subject internal energy absorbing ring to be installed in all 250-C30 series engines. Previous references to airframe mounted, external containment shields and the Allison Assured Engine configuration were deleted. This amendment removes reference to Civil Aviation Order (CAO) 106.