Airworthiness directives › 2022-10-06
AD 2022-10-06 Airworthiness Directives; Rolls-Royce Corporation Turboshaft Engines
Applicability*9
This AD applies to Rolls-Royce Corporation (RRC) 250-C20, 250-C20B, 250-C20C (T63-A-720), 250-C20F, 250-C20J, 250-C20R, 250-C20R/1, 250-C20R/2, 250-C20R/4, 250-C20W, 250-C300/A1, and 250-C300/B1 model turboshaft engines with either a 3rd-stage turbine wheel, part number (P/N) 23065818, or a 4th-stage turbine wheel, P/N 23055944 or RR30000240, installed.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Within 1,775 hours since last visual inspection and fluorescent penetrant inspection (FPI), or at the next engine shop visit, whichever occurs first after the effective date of this AD, remove: (i) 3rd-stage turbine wheel, P/N 23065818, and replace with a part eligible for installation. (ii) 4th-stage turbine wheel, P/N 23055944, and replace with a part eligible for installation. (2) Within 2,025 hours since last visual inspection and FPI, or at the next engine shop visit, whichever occurs first after the effective date of this AD, remove 4th-stage turbine wheel, P/N RR30000240, and replace with a part eligible for installation.
Unsafe condition
This AD was prompted by in-service turbine blade failures that resulted in the loss of power and engine in-flight shutdowns. The FAA is issuing this AD to prevent failure of the 3rd-stage and 4th-stage turbine blades. The unsafe condition, if not addressed, could result in damage to the engine and damage to the aircraft.
Affected ADs
This AD replaces AD 2017-18-14, Amendment 39-19023 (82 FR 42443, September 8, 2017).
Read the original on the Federal Register →
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