CTHIn ForceLegislation
AD/PW4000/21 - 2nd Stage High Pressure Turbine Air Seal Assembly
//
© 2026 Zoe. All rights reserved.
Zoe is a legal information platform. Always consult the Federal Register of Legislation for authoritative text.
AD/PW4000/21 - 2nd Stage High Pressure Turbine Air Seal Assembly
Start here
Turn the raw legal text into a practical explanation grounded in AD/PW4000/21 - 2nd Stage High Pressure Turbine Air Seal Assembly.
| AD/PW4000/21 | 2nd Stage High Pressure TurbineAir Seal Assembly | 20/2010 |
|---|
| Applicability: | Pratt and Whitney PW4000 engines as specified by models in FAA AD 2001-20-02. |
|---|---|
| Requirement: | Unless previously accomplished, perform the actions in accordance with the technical requirements of FAA AD 2001-20-02.Repeat the actions in accordance with the technical requirements of FAA AD2001-20-02.Later revisions to PW ASB PW4G-112-A72-233, Revision 3, dated 3 August 2001, approved by the United States Federal Aviation Administration (FAA) as an Alternate Method of Compliance (AMOC) to FAA AD 2001-20-02, are considered acceptable for compliance with the equivalent Requirements of this AD. |
| Compliance: | As specified in the Requirement Document with a revised effective date of21 October 2010. |
| This Airworthiness Directive becomes effective on 21 October 2010. | |
| Background: | Reports have been received that thirteen 2nd stage High Pressure Turbine (HPT) air seal assemblies have been found cracked in the rim area. The actions specified in this AD are intended to prevent fracture of the 2nd stage HPT air seal assembly that could result in an uncontained engine failure. |
Image unavailable in extracted text
Charles Lenarcic
Delegate of the Civil Aviation Safety Authority
22 September 2010