Airworthiness Directive · Amendment 39-11800 · Allison Engine Company, Inc. AE 3007A and AE 3007C Series Turbofan Engines
Allison Engine Company, Inc. AE 3007A and AE 3007C Series Turbofan Engines
Allison Engine Company, Inc. AE 3007A and AE 3007C series turbofan engines, installed on, but not limited to, Cessna Aircraft Company 750 series airplanes and Empresa Brasileira de Aeronautica S.A. (Embraer) EMB-145 series airplanes.
Note 1: This airworthiness directive (AD) applies to each engine identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For engines that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (d) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.
This amendment adopts a new airworthiness directive (AD) that is applicable to Allison Engine Company, Inc. AE 3007A and AE 3007C series turbofan engines. This AD requires the removal from service of certain turbine wheels before exceeding new, reduced cyclic life limits. This amendment is prompted by a refined life analysis that was performed by the manufacturer. The actions specified by this AD are intended to prevent an uncontained turbine wheel failure, which could result in damage to the airplane.
Required as indicated, unless accomplished previously.
To prevent an uncontained turbine wheel failure, which could result in damage to the airplane, accomplish the following:
Remove stage 1 turbine wheels, part numbers (P/Ns) 23065891 and 23062373, and replace with new or serviceable parts as follows:
(1) For stage 1 turbine wheels with serial numbers (SNs) listed in Table 5 of Rolls-Royce Alert Service Bulletin (ASB) AE 3007A-A-72-105 and AE 3007C-A-72-105, dated January 29, 1999, replace before accumulating 9,000 engine cycles since new (CSN).
(2) For all other stage 1 turbine wheel SNs with P/Ns 23065891 and 23062373, replace before accumulating 13,100 engine CSN.
(b) Remove stage 2 turbine wheels, P/Ns 23065892 and 23063462, and replace with new or serviceable parts as follows:
(1) For stage 2 turbine wheels with SNs listed in Table 6 of Rolls-Royce ASB AE 3007A-A-72-105 and AE 3007C-A-72-105, dated January 29, 1999, replace before accumulating 7,800 engine CSN.
(2) For all other stage 2 turbine wheel SNs with P/Ns 23065892 and 23063462, replace before accumulating 8,400 engine CSN.
This AD establishes new cyclic life limits for the turbine wheels identified in paragraphs (a) and (b) of this AD. Except in accordance with paragraph (d) of this AD, no alternative life limits may be approved for the turbine wheels identified in paragraphs (a) and (b) of this AD.
