Airworthiness Directive · Amendment 39-17324 · Rolls-Royce plc Turbofan Engines
Rolls-Royce plc Turbofan Engines
This AD applies to Rolls-Royce plc RB211-Trent 970-84, 970B-84, 972-84, 972B-84, 977-84, 977B-84, and 980-84 turbofan engines with a fuel oil heat exchanger (FOHE), part number 47111-1241, installed.
We are adopting a new airworthiness directive (AD) for all Rolls-Royce plc (RR) RB211-Trent 970-84, 970B-84, 972-84, 972B-84, 977- 84, 977B-84, and 980-84 turbofan engines. 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. We are issuing this AD to prevent rotor bearing oil starvation, uncontained engine failure, and damage to the airplane.
Unless already done, do the following actions.
(1) For engines installed on the effective date of this AD, replace the FOHE within 500 engine hours (EHs) from the effective date of this AD, or before exceeding 5,000 EHs time since new (TSN) or time since overhaul (TSO), whichever occurs later.
(2) For engines in the shop on the effective date of this AD, do not approve the engine for return to service if the FOHE has 5,000 or more EHs TSN or TSO.
(3) After the effective date of this AD, do not install a FOHE on any engine, or any engine on any airplane, unless the FOHE has fewer than 5,000 EHs TSN or TSO.
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.
Engines
