EASA plans to mandate inspections of certain Rolls-Royce Trent 1000 low-pressure turbine (LPT) discs following a report from the firm that of the potential for cracks.

EASA’s proposed airworthiness directive (AD), issued July 6, calls for operators of Boeing 787s with Trent 1000 “Package C” variants to inspect LPT stage 3 and 4 disc seal fins for cracks.

“Analysis of certain [LPT] discs in service has determined that, due to rubbing contact with interstage static seals, cracks may initiate in the front seal fins which could lead to cracks in the disc of the affected parts,” EASA said in the AD.

The AD is unrelated is to Rolls-Royce’s ongoing programme to deal with high-pressure turbine blade issues that have impacted the Trent 1000-powered 787 fleet for several years.