Airworthiness Directive · Amendment 39-11982 · CFE Company Model CFE738-1-1B Turbofan Engines
CFE Company Model CFE738-1-1B Turbofan Engines
CFE Company Model CFE738-1-1B turbofan engines, installed on but not limited to the Dassault Aviation Falcon 2000 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 (c) 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), applicable to CFE Company model CFE738-1-1B turbofan engines, that requires new life limits for certain HPC rotor components in all engines. This amendment is prompted by a reduction in the calculated service life of certain compressor rotor rotating parts to values below currently approved service lives. The actions specified by this AD are intended to prevent failure of certain HPC rotor components, which could result in an uncontained engine failure and damage to the airplane.
To prevent failure of certain high pressure compressor
(HPC) rotor components, which could result in an uncontained engine failure and damage to the airplane, accomplish the following:
(a) Remove from service certain stage 4 and 5 blisks and impeller aft shafts prior to exceeding the new cyclic life limits as follows, and replace with serviceable parts:
| Nomenclature | Part No. (P/N) | Cyclic life limit |
|---|---|---|
| Stage 4 and 5 Blisk | 6079T74P08 | 6,700 cycles since new (CSN). |
| Impeller Aft Shaft | 6079T80P04 | 5,100 CSN. |
| 6079T80P05 | 2,160 CSN. | |
| 6079T80P06 | 7,100 CSN. | |
| 6079T80P07 | 7,100 CSN. |
(b) Except for the provisions of paragraph (c) of this AD, no parts, identified by P/N in paragraph (a) of this AD, that exceed the new life limits may be installed.
