Airworthiness Directive · Amendment 39-17804 · Pratt & Whitney Turbofan Engines
Pratt & Whitney Turbofan Engines
Superseded. A later AD replaced this one: AD 2017-11-06. Comply with the one in force.
This AD applies to all Pratt & Whitney (PW) PW2037, PW2037D, PW2037M, PW2040, PW2040D, PW2043, PW2146, PW2240, PW2337, PW2643, and F117-PW-100 turbofan engines.
We are adopting a new airworthiness directive (AD) for all Pratt & Whitney (PW) PW2037, PW2037D, PW2037M, PW2040, PW2040D, PW2043, PW2146, PW2240, PW2337, PW2643, and F117-PW-100 turbofan engines. This AD was prompted by a rupture of the diffuser-to-high-pressure turbine (HPT) case flange. This AD requires a one-time eddy current inspection (ECI) of affected engines with certain diffuser and HPT cases installed. This AD also requires a fluorescent-penetrant inspection (FPI) of the diffuser case rear flange and HPT case front flange. We are issuing this AD to prevent failure of the diffuser-to-HPT case flange, which could lead to uncontained engine failure and damage to the airplane.
Unless already done, comply with this AD within the compliance times specified.
(1) For diffuser case part number (P/N) 1B7461, serial numbers (S/Ns) DGGUAK1306 and DGGUAK1308, and HPT case P/N 1B2440, S/N DKLBCS1032:
(i) Within 100 flight cycles or 30 days after the effective date of this AD, whichever is later, eddy current inspect (ECI) the diffuser case and the HPT case M-flange. Use PW Service Bulletin (SB) No. PW2000 72-763, Revision 1, dated August 30, 2013, to do the inspection.
(ii) Reserved.
(2) For all diffuser and HPT cases at the next piece part opportunity and every piece part opportunity thereafter, perform a high sensitivity fluorescent-penetrant inspection (FPI) of the entire diffuser case rear flange (M-flange) and bolt holes, and the entire HPT case forward flange (M-flange) and bolt holes.
As a terminating action to the repetitive inspection requirements of this AD, you may insert the repetitive inspection requirement identified in paragraph (e)(2) of this AD into the required inspection portion of your continuous airworthiness maintenance program.
For the purpose of this AD, piece part opportunity is defined as when the part is completely disassembled.
After the effective date of this AD, do not install any engine with a diffuser or HPT case onto any airplane that was not inspected using paragraph (e) of this AD.
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.
