Airworthiness directives › 2026-09-02
AD 2026-09-02 Airworthiness Directives; Pratt & Whitney RTX Corporation (Type Certificate Previously Held by Pratt & Whitney Division United Technologies Corporation) Engines
Models named: PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090, PW4090-3. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to certain Pratt & Whitney RTX Corporation (type certificate previously held by Pratt & Whitney Division United Technologies Corporation) (PW) Model PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090, and PW4090-3 engines.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) For HPT 1st-stage air seals with a serial number identified in table 1 to paragraph (g)(1) of this AD: At the next piece part opportunity after the effective date of this AD, remove the HPT 1st-stage air seal from service and replace with a part eligible for installation. Table 1 to Paragraph ( g )(1)—HPT 1st-Stage Air Seals Affected Serial Numbers Serial No. Part No. (P/N) CKLBME2702 50L663 CKLBME2703 50L663 CKLBME2704 50L663 CKLBME2705 50L663 CKLBME2711 50L663 CKLBMS8019 50L959 (2) At the next piece part opportunity after the effective date of this AD, and thereafter at every piece part opportunity, perform angle ultrasonic scan inspections (AUSIs) of the HPC 15th-stage disk, front turbine hub, HPT 1st-stage air seal, and HPT 2nd-stage hub for crack indications in accordance with the applicable service information specified in paragraph (g)(2)(i) through (iv) of this AD. (i) For HPC 15th-stage disks: Accomplishment Instructions, paragraph 4.A or 4.B., of PW Alert Service Bulletin (ASB) PW4G-112-A72-365, Revision No. 1, dated June 20, 2024. (ii) For front turbine hubs: Accomplishment Instructions, paragraph 4.A or 4.B., of PW ASB PW4G-112-A72-367, dated June 20, 2024. (iii) For HPT 1st-stage air seals: Accomplishment Instructions, paragraph 4.A or 4.B., of PW ASB PW4G-112-A72-366, dated June 20, 2024. (iv) For HPT 2nd-stage hubs: Accomplishment Instructions, paragraph 4.A or 4.B., of PW ASB PW4G-112-A72-368, dated June 20, 2024. (3) If during any inspection required by paragraph (g)(2) of this AD, any crack indication is found, before further flight, remove the part from service and replace with a part eligible for installation.
Unsafe condition
This AD was prompted by an analysis of an event involving an International Aero Engines, LLC Model PW1127GA-JM engine, which experienced a high-pressure compressor (HPC) 7th-stage integrally bladed rotor separation that resulted in an aborted takeoff. The FAA is issuing this AD to prevent failure of the HPC 15th-stage disk, front turbine hub, high pressure turbine (HPT) 1st-stage air seal, and HPT 2nd-stage hub. The unsafe condition, if not addressed, could result in uncontained disk failure, release of high energy debris, damage to the engine, damage to the airplane, and possible loss of the airplane.
Affected ADs
None.
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