Airworthiness Directive · Amendment 39-18390 · Rolls-Royce plc Turbojet Engines
Rolls-Royce plc Turbojet Engines
Superseded. A later AD replaced this one: AD 2018-17-08. Comply with the one in force.
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) 2013-11-13 for all Rolls-Royce plc (RR) Viper Mk. 601-22 turbojet engines. AD 2013-11- 13 required reducing the life of certain critical parts. This AD adds two new engine models and additional engine parts to the applicability. This AD was prompted by a determination by RR that additional parts for the RR Viper Mk. 601-22 as well as additional engine models are affected. We are issuing this AD to prevent failure of life-limited parts, which could lead to an uncontained part release, damage to the engine, and damage to the airplane.
(1) Within 30 days after the effective date of this AD, or before any affected part exceeds its new revised life limit, whichever occurs later, remove any affected engine from service. Use Table 1 of RR Alert Service Bulletin (ASB) Mk. 521 Number 72-A408, Circulation A, dated January 2015; RR ASB Mk. 521 Number 72-A408, Circulation B, dated January 2015; RR ASB Mk. 522 Number 72-A413, Circulation A, dated January 2015; RR ASB Mk. 522 Number 72-A412, Circulation B, dated January 2015; and RR ASB Mk 601-22 Number 72-A207, dated January 2015, to identify the affected parts installed on each engine and determine their respective new life limits.
(2) For the RR Viper Mk. 601-22 turbojet engine, remove compressor shaft, part number V900766, from service before the compressor shaft accumulates 20,720 flight cycles since new.
(3) Replace any part identified in paragraph (e)(1) or (e)(2) of this AD with a part eligible for installation before the affected part reaches its new life limit specified in paragraph (e)(2) of this AD or in the ASBs referenced in paragraph (e)(1) of this AD.
After the effective date of this AD, do not install any affected part identified in paragraph (e) of this AD into any engine, nor return any engine to service with any affected part identified in paragraph (e) of this AD installed, if any affected part exceeds the life limit specified in the appropriate ASB identified in paragraph (e)(1) of this AD and/or the life limit identified in paragraph (e)(2) of this AD.
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
