FAA Oct. 4 issued a correction to an airworthiness directive affecting Rolls-Royce plc RB211 Trent 500 series turbofan engines. It specifically applies to Rolls-Royce plc RB211 Trent 553-61, 556-61, 556B-61, 560-61, 553A2-61, 556A2-61, 556B2-61 and 560A2-61 turbofan engines installed on, but not limited to, Airbus A340-500 and -600 series aircraft.
The AD resulted from safety information issued by the U.K., which identified strain induced porosity in a Trent 500 IP Compressor Drum. FAA said that engineering assessments found that the problem was caused by the forging process and likely could be a batch related occurrence. It mandated that the IP Compressor Drums be removed from service at next engine overhaul or before accumulating 2,910 cycles-since-new, whichever comes first, and replaced with a serviceable drum.
If not corrected, FAA said strain induced porosity in the IP Compressor Drum could result, in the worst case, in the uncontained loss of two IP Compressor stage 1 blades. The AD became effective on Oct. 3.
Other recently issued ADs pertain to Hawker Beechcraft model 390 airplanes; Saab model SAAB 2000 airplanes; Airbus model A318-111 and A318-112 airplanes, model A319 , A320 and A321 airplanes; Airbus model 300 and model 310 airplanes; and Eclipse Aviation model EA500 airplanes.