Airworthiness Directive · Amendment 39-22985 · Turbine section
Pratt & Whitney Canada Corp. Engines
This AD applies to Pratt & Whitney Canada Corp. (P&WC) Model PW535E and PW535E1 engines, as identified in Transport Canada Civil Aviation AD CF-2023-60, dated August 14, 2023 (Transport Canada AD CF-2023-60).
The FAA is adopting a new airworthiness directive (AD) for certain Pratt & Whitney Canada Corp. (P&WC) Model PW535E and PW535E1 engines. This AD was prompted by a manufacturer design review that indicated certain flange bolts securing the gas generator case and turbine support case are susceptible to cracking at their current low- cycle fatigue (LCF) life. This AD requires repetitive borescope inspections (BSI) of the gas generator case to turbine support case retaining bolts for evidence of bolt cracks, bolt fracture, missing bolts, or loose bolts and replacement, if necessary, 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-2023-60.
(1) Where Transport Canada AD CF-2023-60 requires compliance from its effective date, this AD requires using the effective date of this AD.
(2) Where paragraph A.1. of Transport Canada AD CF-2023-60 refers to “discrepancy,” this AD defines that as “evidence of bolt cracks, bolt fracture, missing bolts, or loose bolts.”
(3) Where paragraph A.2. in Transport Canada AD CF-2023-60 specifies to “Repeat the above paragraph A.1. inspection and rectification requirements of this AD at intervals not to exceed 400 engine cycles,” this AD requires replacing that text with “Repeat the above paragraph A.1. inspection and rectification requirements of this AD thereafter at intervals not to exceed 400 engine cycles.”
(4) Where paragraph A.1. in Transport Canada AD CF-2023-60 specifies to “Inspect the bolts P/N MS9696-08 and P/N MS9489-06 within 400 cycles from the effective date of this AD,” this AD requires replacing that text with “Inspect affected bolts having P/N MS9696-08 and P/N MS9489-06 within 400 engine cycles from the effective date of this AD.”
(5) Where paragraph A.1. in Transport Canada AD CF-2023-60 specifies to “rectify any discrepancy in accordance with the Accomplishment Instructions of the applicable SB,” this AD requires replacing that text with “Following inspection, if any bolts are determined to be in an unserviceable condition, before further flight, replace the affected bolts in accordance with the applicable SB.”
Although the service information referenced in Transport Canada AD CF-2023-60 specifies to submit certain information to the manufacturer, this AD does not include that requirement.
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.
