Airworthiness Directive · Amendment 39-13951 · McDonnell Douglas Model MD-11 and MD-11F Airplanes Equipped With Pratt & Whitney PW4000 Series Engines
McDonnell Douglas Model MD-11 and MD-11F Airplanes Equipped With Pratt & Whitney PW4000 Series Engines
This AD applies to McDonnell Douglas Model MD-11 and MD-11F airplanes, as listed in Boeing Alert Service Bulletin MD11-79A008, dated December 11, 2001; certificated in any category; equipped with Pratt & Whitney PW4000 series engines.
The FAA is adopting a new airworthiness directive (AD) for certain McDonnell Douglas Model MD-11 and MD-11F airplanes equipped with Pratt & Whitney PW4000 series engines. This AD requires, for each engine, replacing, with a tube assembly, the existing hose assembly that connects the oil pressure transmitter to the main oil circuit. This AD is prompted by a report indicating that, for each engine, the existing hose assembly does not meet zero-flow fireproof capability requirements. We are issuing this AD to prevent, if there is an engine fire, failure of the oil pressure indicator and the low-oil pressure warning, which could result in an unannounced shutdown of that engine; and oil leakage, which may feed the engine fire.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Within 18 months after the effective date of this AD: For each engine, replace the existing hose assembly, part number (P/N) 113286, that connects the oil pressure transmitter to the main oil circuit, with tube assembly P/N 221-5318-501. Do the replacement in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin MD11-79A008, dated December 11, 2001.
Note 1: Boeing Alert Service Bulletin MD11-79A008 refers to Pratt & Whitney Alert Service Bulletin PW4MD11 A79-9, dated October 25, 2001, as an additional source of service information for replacing the hose assemblies.
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.
