Airworthiness directives › 2020-22-18
AD 2020-22-18 Airworthiness Directives; Rolls-Royce Corporation (Type Certificate Previously Held by Allison Engine Company) Turboprop Engines
Applicability*9
This AD applies to all Rolls-Royce Corporation (RRC) (Type Certificate previously held by Allison Engine Company) AE 2100A, AE 2100D2, AE 2100D2A, and AE 2100P model turboprop engines.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) No later than the next shop visit for the engine with the PGB, or the next shop visit for the PGB only, whichever shop visit occurs first after the effective date of this AD, assign usage hours to the installed PGB shaft and carrier assembly using RRC Alert Service Bulletin (ASB) AE 2100A-A-72-322/AE 2100P-A-72-047, Revision 1 (single document), dated May 11, 2018, or RRC ASB AE 2100D2-A-72-111/AE 2100D3-A-72-313/AE 2100J-A-72-111, Revision 1 (single document), dated May 28, 2018. (2) After the effective date of this AD, before exceeding the life limit (usage hours) specified in Table 1 to paragraph (g)(2) (Table 1) of this AD, remove the PGB shaft and carrier assembly, identified by part numbers (P/Ns) in Table 1, from service and replace with a part eligible for installation. ER10NO20.001
Unsafe condition
This AD was prompted by a report of a propeller gearbox (PGB) development test in which high vibration occurred due to a fatigue crack that initiated in the propeller shaft. The FAA is issuing this AD to prevent loss of the propeller. The unsafe condition, if not addressed, could result in damage to the engine and damage to the airplane.
Affected ADs
None.
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