Airworthiness directives › 2026-07-06
AD 2026-07-06 Airworthiness Directives; Pratt & Whitney Engines
Models named: F117-PW-100, PW2037, PW2037D, PW2037M, PW2040, PW2040D. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Pratt & Whitney (PW) Model F117-PW-100, PW2037, PW2037D, PW2037M, PW2040, and PW2040D engines.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) At the next piece-part exposure after the effective date of this AD and thereafter at every piece-part exposure, do an angled ultrasonic inspection (AUSI) of the HPT 1st-stage disk for any crack indications in accordance with Paragraph 4. of the Accomplishment Instructions of PW Alert Service Bulletin (ASB) PW2000 A72-779, Revision No. 1, dated December 17, 2025, or Paragraph 4. of the Accomplishment Instructions of PW ASB PWF117 A72-434, dated May 1, 2024, as applicable to the engine model. (2) At the next piece-part exposure after the effective date of this AD and thereafter at every piece-part exposure, do an AUSI of the turbine hub for any crack indications in accordance with Paragraph 4. of the Accomplishment Instructions of PW ASB PW2000 A72-780, dated May 2, 2024, or Paragraph 4. of the Accomplishment Instructions of PW ASB PWF117 A72-433, dated May 1, 2024, as applicable to the engine model. (3) If, during any inspection required by paragraph (g)(1) or (2) of this AD, any crack indication is found, remove the affected part from service and replace with a part eligible for installation. (4) For engines with an installed HPT lenticular seal assembly having a part number (P/N) and serial number (S/N) identified in figure 1 to paragraph (g)(4) of this AD: At the next piece-part exposure after the effective date of this AD, remove the HPT lenticular seal assembly from service and replace with a part eligible for installation. Figure 1 to Paragraph ( g )(4)—Affected HPT Lenticular Seal Assemblies P/N S/N 1B8575 DKLBG48210 1B8575 DKLBG48244 1B8575 * DKLBGY5898 1B8575 * DKLBGY5907 1B8575 * DKLBGY5908 1B8575 * DKLBGY5911 1B8575 * DKLBGY5913 1B8575 * DKLBGY5915 1B8575 * DKLBGY5916 1B8575 DKLBGY5919 1B8575 * DKLBGY5921 1B8575 DKLBGY5922 1B8575 * DKLBGY5923 1B8575 * DKLBGY5924 1B8575 * DKLBGY5925 1B8575 * DKLBGY5926 1B8575 * DKLBGY5928 1B8575 * DKLBGY5929 1B8575 * DKLBGY5930 1B8575 * DKLBGY5931 1B8575 * DKLBGY5932 1B8575 * DKLBGY5934 1B8575 * DKLBGY5935 1B8575 DKLBGY5936 1B8575 * DKLBGY5937 1B8575 * DKLBGY5938 1B8575 * DKLBGY5939 1B8575 * DKLBGY5940 1B8575 * DKLBGY5941 1B8575 * DKLBGY5943 1B8575 DKLBGY5944 1B8575 DKLBGY5945 1B8575 DKLBGY5946 1B8575 DKLBGY5948 1B8575 DKLBGY5949 1B8575 DKLBGY5952 1B8575 DKLBGY5953 1B8575 DKLBGY5959 * Serial numbers are PW Model F117-PW-100 engines which are not installed on U.S. registered airplanes. (5) For an HPT lenticular seal assembly having P/N 1B8575 and S/N DKLBG48292: At the next piece-part exposure after the effective date of this AD or before exceeding 2,750 cycles since new, whichever occurs first, remove the HPT lenticular seal assembly from service and replace with a part eligible for installation.
Unsafe condition
This AD was prompted by an updated analysis of an event involving an International Aero Engines, LLC Model PW1127GA-JM engine, which experienced a high-pressure compressor 7th-stage integrally bladed rotor separation that resulted in an engine shutdown and aborted takeoff. The FAA is issuing this AD to prevent failure of the high-pressure turbine (HPT) 1st-stage disk, and turbine 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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