PRODUCT: All Rolls-Royce plc (RR) RB211-Trent 970-84, 970B-84, 972-84, 972B-84, 977-84, 977B-84, and 980-84 turbofan engines. SUBJECT: Airworthiness Directive 2013-02-03 ACTION: Final Rule, Request for Comments
SUMMARY: This AD requires replacement of the fuel oil heat exchanger (FOHE). This AD was prompted by a report of an in-flight increase of N2 intermediate pressure rotor vibrations resulting in an engine surge and pilot shut down of the engine. The FAA is issuing this AD to prevent rotor bearing oil starvation, uncontained engine failure, and damage to the airplane.
DATES: This AD becomes effective January 24, 2013. Comments on this AD must be received by March 11, 2013.