GE Aviation (GE) has identified a pool of eight GE90-115B engines that need immediate attention based on early findings in the probe of an Oct. 20 Thai Airways uncontained high-pressure turbine failure.
The FAA has issued an emergency airworthiness directive (AD) mandating the work.
GE in an Oct. 23 alert service bulletin says the interstage seal should be removed from affected engines within 25 cycles. The work requires removing the engine.
The Oct. 23 FAA AD, based on the bulletin, lists the engine serial numbers as 907451, 907464, 907504, 907564, 907574, 907599, 907601, and 907618. The engines are operated by five different airlines, GE said. It did not name the affected carriers.
“The impacted population of eight engines has the same configuration and similar number of cycles and maintenance history as the event engine,” GE said. “GE Aviation has mobilized technical resources, tooling and spare engines as needed to minimize customer disruption due to the associated engine removals.”
The bulletin also recommends ensuring no aircraft has two engines that have the affected seals. The GE90-115B powers the Boeing 777-300ER and -200LR.
The Thai Airways 777-300ER was departing Bangkok for Zurich when the crew rejected the takeoff at low speed. “Debris impacted the aircraft fuselage and the other engine,” the FAA said. No injuries were reported.
The Aircraft Accident and Incident Investigation Commission (AAIIC) of Thailand is leading the probe.