Airworthiness directives › 2021-26-06
AD 2021-26-06 Airworthiness Directives; General Electric Company Turbofan Engines
Applicability*9
This AD applies to General Electric Company (GE) GE90-76B, GE90-85B, GE90-90B, GE90-94B, GE90-110B1, and GE90-115B model turbofan engines with a transfer gearbox (TGB) radial bevel gear (TGB radial gearshaft) serial number listed in paragraph 4., APPENDIX—A, Table 1 of GE GE90 Service Bulletin (SB) 72-1201 R01, dated April 28, 2021 (GE90 SB 72-1201 R01) or paragraph 4., APPENDIX—A, Table 1 of GE GE90-100 SB 72-0857 R01, dated April 28, 2021 (GE90-100 SB 72-0857 R01).
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) At the next engine shop visit after the effective date of this AD, perform a visual inspection of the affected TGB radial gearshaft using Figure 1 to paragraph (g)(1) of this AD. ER11JA22.000 (2) If, during the visual inspection required by paragraph (g)(1) of this AD, discrepancies are found that meet the criteria in the Accomplishment Instructions, paragraph 3.A.(4)(a) or 3.A.(4)(b), of GE90 SB 72-1201 R01 or GE90-100 SB 72-0857 R01, before further flight, replace the TGB radial gearshaft with a part eligible for installation.
Unsafe condition
This AD was prompted by two separate in-flight shutdowns resulting from the failure of the TGB radial gearshaft. The FAA is issuing this AD to prevent failure of the TGB radial gearshaft. The unsafe condition, if not addressed, could result in failure of one or more engines, loss of thrust control, and damage to the aircraft.
Affected ADs
None.
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