Airworthiness Directive · Amendment 39-22670 · Turbine section
Pratt & Whitney Canada Corp. Engines
This AD applies to Pratt & Whitney Canada Corp. Model PW307A and PW307D engines.
The FAA is adopting a new airworthiness directive (AD) for all Pratt & Whitney Canada Corp. (P&WC) Model PW307A and PW307D engines. This AD is prompted by a root cause analysis of an event involving an uncontained failure of a high-pressure turbine (HPT) 1st-stage disk that resulted in high-energy debris penetrating the engine cowling and an aborted takeoff. This AD requires removing from service and replacing certain HPT disks and also prohibits installing certain HPT disks on any engine, as specified in a Transport Canada AD, which is incorporated by reference. The FAA is issuing this AD to address the unsafe condition on these products.
Except as specified in paragraphs (h) and (i) of this AD: Perform all required actions within the compliance times specified in, and in accordance with, Transport Canada AD CF-2023-30, dated May 8, 2023 (Transport Canada AD CF-2023-30).
(1) Where Transport Canada AD CF-2023-30 requires compliance from its effective date, this AD requires using the effective date of this AD.
(2) Where paragraph A. of Transport Canada AD CF-2023-30 specifies “Before 31 January 2027,” replace that text with “Within 36 months after the effective date of this AD.”
(3) Where paragraph B. of Transport Canada AD CF-2023-30 specifies “At the next opportunity, when the affected engine is disassembled and access is available to the HPT disk, remove any affected HPT disk listed in Table 2 or Table 4 below and replace the affected HPT disk with a serviceable part,” replace that text with “For any engine with an installed HPT disk listed in Table 2 or Table 4 [of Transport Canada AD CF-2023-30], at the next piece-part exposure, remove the affected HPT disk from service and replace with a serviceable part.”
Although the service information referenced in Transport Canada AD CF-2023-30 specifies to submit certain information to the manufacturer, this AD does not include that requirement.
(1) For the purpose of this AD, “piece-part exposure” is when the affected part is removed from the engine and completely disassembled.
(2) For the purpose of this AD, a “serviceable part” is any HPT disk that is not identified in Tables 1 through 4 of Transport Canada AD CF-2023-30.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
