Airworthiness Directive · Amendment 39-21101 · Turbine engine oil system
Pratt & Whitney Turbofan Engines
This AD applies to all Pratt & Whitney (PW) PW1519G, PW1521G, PW1521GA, PW1524G, PW1525G, PW1521G-3, PW1524G-3, PW1525G-3, PW1919G, PW1921G, PW1922G, PW1923G, and PW1923G-A model turbofan engines.
The FAA is adopting a new airworthiness directive (AD) for all Pratt & Whitney (PW) PW1519G, PW1521G, PW1521GA, PW1524G, PW1525G, PW1521G-3, PW1524G-3, PW1525G-3, PW1919G, PW1921G, PW1922G, PW1923G, and PW1923G-A model turbofan engines. This AD was prompted by reports of in-flight shutdowns due to oil leaking from the connection between the LP10 oil supply tube and the fuel oil cooler (FOC). This AD requires initial and repetitive gap inspections of the LP10 oil supply tube and the FOC and, if a gap is found, replacement of these parts. The FAA is issuing this AD to address the unsafe condition on these products.
(1) Within 300 engine cycles from the effective date of this AD, perform an initial gap inspection with a 0.001 inch feeler gauge between the LP10 oil supply tube, part number (P/N) 5312624-01, and the FOC, P/N 5306769.
(i) If any gap is found, remove the LP10 oil supply tube and the FOC and replace with parts eligible for installation prior to further flight.
(ii) If no gap is found, repeat this inspection every 850 engine cycles since the previous inspection.
(2) At the next shop visit after the effective date of this AD, remove the LP10 oil supply tube, P/N 5312624-01, and the FOC, P/N 5306769, and replace with parts eligible for installation.
Removal of the affected LP10 oil supply tube and the FOC per the requirements of paragraphs (g)(1)(i) or (g)(2) of this AD constitutes terminating action for the inspections required by paragraph (g)(1) of this AD.
(1) For the purpose of this AD, an “engine shop visit” is the induction of an engine into the shop for maintenance involving the separation of pairs of major mating engine case flanges, except separation of engine flanges solely for the purposes of transportation of the engine without subsequent maintenance does not constitute an engine shop visit.
(2) For the purpose of this AD, an LP10 tube eligible for installation is any LP10 tube with a P/N other than P/N 5312624-01.
(3) For the purpose of this AD, an FOC eligible for installation is one with a P/N other than P/N 5306769 or an FOC modified per PW SB PW1000G-A-79-00-0004-00B-930A-D or PW SB PW1000G-A-79-00-0011-00A-930A-D, both Issue No: 006, and both dated March 20, 2019.
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.
