Airworthiness directives › 2023-20-08
AD 2023-20-08 Airworthiness Directives; General Electric Company Engines
Models named: CF6-80C2B1F, CF6-80C2B2F, CF6-80C2B4F, CF6-80C2B5F, CF6-80C2B6F, CF6-80C2B7F, CF6-80C2K1F. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
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.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(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.
Unsafe condition
This AD was prompted by an uncontained engine fire and consequent manufacturer investigation which revealed that certain bearings were installed improperly. The FAA is issuing this AD to prevent premature bearing failure. The unsafe condition, if not addressed, could result in engine fire and damage to the airplane.
Affected ADs
None.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1