Airworthiness Directive · Amendment 39-19362 · Compressor section
Rolls-Royce plc Turbojet Engines
This AD applies to all Rolls-Royce plc (RR) Viper Mk. 521, Viper Mk. 522, and Viper Mk. 601-22 turbojet engines.
We are superseding Airworthiness Directive (AD) 2016-03-03 for all Rolls-Royce plc (RR) Viper Mk. 521, Viper Mk. 522, and Viper Mk. 601-22 turbojet engines. AD 2016-03-03 required reducing the life of certain critical parts. This AD requires reducing the life of certain critical parts and adds additional engine parts to the applicability. This AD was prompted by a determination made by RR that additional parts for the applicable RR Viper turbojet engine models are affected. We are issuing this AD to address the unsafe condition on these products.
(1) Remove from service any Group A component listed in Table 1 of the RR Alert Service Bulletins (ASBs) listed in paragraphs (g)(1)(i) through (v) of this AD within 30 days after the effective date of this AD, or before the part exceeds the revised life limit specified in the applicable ASB, whichever occurs later.
(i) RR ASB Mk. 521 Number 72-A408, Circulation A (Revision 1), dated June 2017.
(ii) RR ASB Mk. 521 Number 72-A408, Circulation B (Revision 1), dated June 2017.
(iii) RR ASB Mk. 522 Number 72-A413, Circulation A (Revision 1), dated June 2017.
(iv) RR ASB Mk. 522 Number 72-A412, Circulation B (Revision 1), dated June 2017.
(v) RR ASB Mk. 601-22 Number 72-A207, Rev. 1, dated June 2017.
(2) Reserved.
After the effective date of this AD, do not install any Group A component identified in Table 1 of the RR ASBs in paragraph (g)(1)(i) through (v) of this AD into any engine, or return any engine to service with any affected part installed, if the affected part exceeds the revised life limit specified in the applicable ASB.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Engines
