CTHIn ForceLegislation
AD/AL 250/64 Amdt 4 Internal Energy Absorbing Ring
//
© 2026 Zoe. All rights reserved.
Zoe is a legal information platform. Always consult the Federal Register of Legislation for authoritative text.
AD/AL 250/64 Amdt 4 Internal Energy Absorbing Ring
Start here
Turn the raw legal text into a practical explanation grounded in AD/AL 250/64 Amdt 4 Internal Energy Absorbing Ring.
| 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. |
Signature of Delegate
David Punshon
Delegate of the Civil Aviation Safety Authority
29 September 2021