Airworthiness directives › 2018-09-07
AD 2018-09-07 Airworthiness Directives; Rolls-Royce plc Turbojet Engines
Applicability*9
This AD applies to all Rolls-Royce plc (RR) Viper Mk. 601-22 engines.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) For engines with an oil pump assembly, part number (P/N) V112225 or P/N NPN11962, installed: (i) After the effective date of this AD, within 30 days or 25 flight hours, whichever occurs first, inspect the oil pump assembly to determine the P/N of the oil pressure filter in accordance with the Accomplishment Instructions, Paragraph 2.A.(3), of RR Alert Service Bulletin (ASB) Mk. 601-22 Number 72-A208, dated September 2017. (ii) If an oil pressure filter, P/N V21264, is installed, replace the oil pressure filter before the next flight with oil filter, P/N 2526, in accordance with the Accomplishment Instructions, Paragraph 2.A.(3)(b), of RR ASB Mk. 601-22 Number 72-A208, dated September 2017. (2) For engines with an oil pump assembly, P/N V112027, installed: (i) After the effective date of this AD, within 30 days or 25 flight hours, whichever occurs first, replace the oil pump assembly with oil pump assembly, P/N V112225 or P/N NPN11962, in accordance with the Accomplishment Instructions, Paragraph 2.A.(2), of RR ASB Mk. 601-22 Number 72-A208, dated September 2017. (ii) Reserved.
Unsafe condition
This AD was prompted by a report of an engine failure caused by the installation of an incorrect oil filter. We are issuing this AD to prevent a failure of the engine oil system. The unsafe condition, if not addressed, could result in loss of engine thrust control, and reduced control of the airplane.
Affected ADs
None.
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