Airworthiness directives › 2025-05-02
AD 2025-05-02 Airworthiness Directives; General Electric Company Engines
Models named: CT7-5A2, CT7-5A3, CT7-7A, CT7-7A1, CT7-9B, CT7-9B1, CT7-9B2, CT7-9C, CT7-9C3, CT7-9D. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to General Electric Company (GE) Model CT7-5A2, CT7-5A3, CT7-7A, CT7-7A1, CT7-9B, CT7-9B1, CT7-9B2, CT7-9C, CT7-9C3, CT7-9D, and CT7-9D2 engines with an installed stage 1 turbine forward cooling plate having part number (P/N) 6064T08P01; or with an installed stage 2 turbine aft cooling plate having P/N 6064T07P05 or P/N 6068T36P01.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within the compliance times specified in paragraphs (g)(1) through (3) of this AD, replace the affected stage 1 turbine forward cooling plate or stage 2 turbine aft cooling plate, as applicable, with a replacement P/N eligible for installation, in accordance with table 1 to the introductory text of paragraph (g) of this AD: Table 1 to the Introductory Text of Paragraph (g) —Cooling Plate Replacement P/Ns Engine group Part name Affected P/N Replacement P/N 1 Stage 1 turbine forward cooling plate 6064T08P01 6064T08P04. 1 Stage 2 turbine aft cooling plate 6064T07P05 6064T07P07. 1 Stage 2 turbine aft cooling plate 6068T36P01 6068T36P04. 2 Stage 1 turbine forward cooling plate 6064T08P01 6064T08P03 or 6064T08P04. 2 Stage 2 turbine aft cooling plate 6064T07P05 6064T07P07. 2 Stage 2 turbine aft cooling plate 6068T36P01 6068T36P04. (1) For Group 1 engines with an affected part installed, replace the affected part at the next exposure of the gas generator stator assembly that occurs after the effective date of this AD. (2) For Group 2 engines with an affected part installed having 7,000 part cycles since new (PCSN) or less as of the effective date of this AD, replace the affected part at the next exposure of the gas generator stator assembly or within 2,000 flight cycles (FCs) but before reaching 7,500 PCSN, whichever occurs first after the effective date of this AD. (3) For Group 2 engines with an affected part installed having more than 7,000 PCSN as of the effective date of this AD, replace the affected part at the next exposure of the gas generator stator assembly or within 500 FCs, whichever occurs first after the effective date of this AD.
Unsafe condition
This AD was prompted by the manufacturer's determination that certain GE Model CT7 fleets have affected cooling plates installed that do not meet lifing guidelines. The FAA is issuing this AD to prevent the failure of the stage 1 turbine forward cooling plate and stage 2 turbine aft cooling plate. The unsafe condition, if not addressed, could result in uncontained engine failure 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