Airworthiness directives › 2022-05-08
AD 2022-05-08 Airworthiness Directives; General Electric Company Turbofan Engines
Applicability*9
This AD applies to General Electric Company (GE) CF34-10E2A1, CF34-10E5, CF34-10E5A1, CF34-10E6, CF34-10E6A1, CF34-10E7, and CF34-10E7-B model turbofan engines with a stationary oil seal, part number (P/N) B1316-00453 or P/N B1316-01274, installed at the No. 1 forward bearing, that: (1) Has been repaired, overhauled, or entered into service after August 2014; and (2) Has used high thermal stability oil or high performance capability oil for 56 flight hours (FHs) or more during the life of the stationary oil seal.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Before the stationary oil seal accumulates 100 FHs after the effective date of this AD, or within 100 FHs of the stationary oil seal accumulating 2,250 FHs since new, whichever occurs later, perform an initial visual inspection of the strainer assembly screen for Teflon material. Guidance on performing the visual inspection of the strainer assembly screen can be found in the Accomplishment Instructions, paragraph 3.A.(1)(d), of GE CF34-10E Service Bulletin (SB) 72-0365 R04, dated April 27, 2021. (2) Thereafter, within the following compliance times, repeat the visual inspection of the strainer assembly screen required by paragraph (g)(1) of this AD: (i) For an affected stationary oil seal having accumulated 2,250 to 7,000 FHs since new at the time of the last inspection, repeat the visual inspection every 750 FHs. (ii) For an affected stationary oil seal having accumulated 7,001 to 10,000 FHs since new at the time of the last inspection, repeat the visual inspection every 375 FHs. (iii) For an affected stationary oil seal having accumulated more than 10,000 FHs since new at the time of the last inspection, repeat the visual inspection every 100 FHs. (3) If, based on any inspection required by paragraph (g)(1) or (2) of this AD, Teflon material is found in the strainer assembly screen, before further flight, remove the stationary oil seal at the No. 1 forward bearing from service and replace it with a part eligible for installation. (4) Before an affected stationary oil seal accumulates 10,000 FHs since new or within 500 FHs after the effective date of this AD, whichever occurs later, remove the stationary oil seal at the No. 1 forward bearing from service and replace it with a part eligible for installation.
Unsafe condition
This AD was prompted by investigation by the manufacturer that revealed Teflon material in the A-sump oil strainer (strainer assembly) screen after several reports of in-flight shutdowns and unscheduled engine removals. The FAA is issuing this AD to prevent failure of the stationary oil seal at the No. 1 forward bearing. The unsafe condition, if not addressed, could result in failure of the engine, in-flight shutdown, and loss of control of the airplane.
Affected ADs
None.
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