Airworthiness directives › 2018-17-08
AD 2018-17-08 Airworthiness Directives; Rolls-Royce plc Turbojet Engines
Applicability*9
This AD applies to all Rolls-Royce plc (RR) Viper Mk. 521, Viper Mk. 522, and Viper Mk. 601-22 turbojet engines.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(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.
Unsafe condition
This AD was prompted by a review by RR of the lives of certain critical parts. We are issuing this AD to prevent failure of life-limited parts. This unsafe condition, if not addressed, could result in uncontained part release, damage to the engine, and damage to the airplane.
Affected ADs
This AD replaces AD 2016-03-03, Amendment 39-18390 (81 FR 12585, March 10, 2016).
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