Airworthiness Directive · Amendment 39-22567 · Engine
General Electric Company Engines
General Electric Company (GE) Model CF6-80C2B1F, CF6-80C2B2F, CF6-80C2B4F, CF6-80C2B5F, CF6-80C2B6F, CF6-80C2B7F, and CF6-80C2K1F engines, having engine serial numbers (S/Ns) 630-136 through 630-156 inclusive, and engine S/Ns 707-510 through 707-645 inclusive, which have accumulated less than 400 engine cycles since new (CSN) on the effective date of this AD.
The FAA is adopting a new airworthiness directive (AD) for certain General Electric Company (GE) Model CF6-80C2B1F, CF6-80C2B2F, CF6-80C2B4F, CF6-80C2B5F, CF6-80C2B6F, CF6-80C2B7F, and CF6-80C2K1F engines. This AD was prompted by an uncontained engine fire and consequent manufacturer investigation, which revealed that certain bearings were installed improperly. This AD requires inspection of the magnetic chip detector (MCD) probe tip for metallic particles and, if necessary, removal of the engine from service. The FAA is issuing this AD to address the unsafe condition on these products.
(1) For affected engines, within 15 engine cycles after the effective date of this AD, inspect the magnetic chip detector (MCD) for metallic particles that cover more than 10 percent of the probe tip, and if necessary, do a material composition analysis as applicable, in accordance with paragraph 3., Accomplishment Instructions, of GE CF6-80C2 Service Bulletin (SB) 72-1631, R00, dated August 25, 2023 (GE SB 72-1631).
(2) Thereafter, at the applicable times specified in paragraphs (g)(2)(i) through (iii), inspect the MCD for metallic particles that cover more than 10 percent of the probe tip, and if necessary, do a material composition analysis as applicable, in accordance with paragraph 3., Accomplishment Instructions, of GE SB 72-1631.
(i) For engines that have accumulated less than 100 engine CSN, within 25 engine cycles after the previous inspection.
(ii) For engines that have accumulated 100 or more and less than 200 engine CSN, within 50 engine cycles after the previous inspection.
(iii) For engines that have accumulated 200 or more and less than 399 engine CSN, within 100 engine cycles after the previous inspection.
(3) If bearing material is detected during any inspection and analysis required by paragraphs (g)(1) and (2) of this AD, before further flight, remove the engine from service.
If a positive identification of bearing material was made during the inspection and analysis required by paragraphs (g)(1) and (2) of this AD, submit a report within 10 days after the positive identification or within 10 days after the effective date of this AD, whichever occurs later. The report must include the MCD probe tip inspection results, material composition analysis, the engine serial number, and number of engine CSN. Submit the report to GE Aviation Fleet Support in accordance with paragraph 3., Accomplishment Instructions, of GE SB 72-1631.
