Airworthiness directives › 2023-18-04
AD 2023-18-04 Airworthiness Directives; General Electric Company Engines
Models named: CF6-80E1A2, CF6-80E1A3, CF6-80E1A4, CF6-80E1A4/B. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to General Electric Company Model CF6-80E1A2, CF6-80E1A3, CF6-80E1A4, and CF6-80E1A4/B engines with an installed forward outer seal, high-pressure turbine rotor (HPTR) stage 1 disk, or rotating seal having a part number (P/N) and serial number (S/N) identified in Table 1 to paragraph (c) of this AD. Table 1 to Paragraph ( c )—Affected Forward Outer Seal, HPTR Stage 1 Disks, and Rotating Seals Part name P/N Part S/N Forward outer seal 1778M70P03 NCU65340 HPTR stage 1 disk 1863M36G06 TMT5TD23 TMT5TD26 TMT5TD27 Rotating seal 1778M69P06 BTB20610 BTB20611 BTB20612 BTB26650
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) At the next piece-part exposure of the affected forward outer seal or before the affected forward outer seal exceeds 5,400 cycles since new (CSN), whichever occurs first after the effective date of this AD, remove the affected forward outer seal from service and replace with a part eligible for installation. (2) At the next piece-part exposure of the affected rotating seal or before the affected rotating seal exceeds 5,200 CSN, whichever occurs first after the effective date of this AD, remove the affected rotating seal from service and replace with a part eligible for installation. (3) Before further flight after the effective date of this AD, remove the affected HPTR stage 1 disk from service and replace with a part eligible for installation.
Unsafe condition
This AD was prompted by a manufacturer investigation that revealed that a certain forward outer seal and certain HPTR stage 1 disks and rotating seals were manufactured from material suspected to contain iron inclusion, which may cause reduced material properties and a lower fatigue life capability. The FAA is issuing this AD to prevent fracture and subsequent uncontained failure of a certain forward outer seal and certain HPTR stage 1 disks and rotating seals. The unsafe condition, if not addressed, could result in uncontained debris release, damage to the engine, and damage to the aircraft.
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