Airworthiness Directive · Amendment 39-21314 · Turbine engine reduction gear
Rolls-Royce Corporation (Type Certificate Previously Held by Allison Engine Company) Turboprop Engines
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.
The FAA is adopting a new airworthiness directive (AD) for all Rolls-Royce Corporation (RRC) AE 2100A, AE 2100D2, AE 2100D2A, and AE 2100P model turboprop engines. This AD was prompted by a report of a propeller gearbox (PGB) development test conducted by the manufacturer, in which high vibration occurred due to a fatigue crack that initiated in the PGB shaft and carrier assembly. This AD requires assignment of usage hours to the PGB shaft and carrier assembly at the next engine shop visit and replacement of PGB shaft and carrier assemblies prior to exceeding the new life limits established by the manufacturer. The FAA is issuing this AD to address the unsafe condition on these products.
(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.
The reporting requirements in RRC ASB AE 2100A-A-72-322/AE 2100P-A-72-047, Revision 1 (single document), dated May 11, 2018, and 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, are not required by this AD.
