Operators of Boeing 787s with Rolls-Royce Trent 1000 powerplants are facing further safety measures, with regulators set to order replacement of cover plates on the high-pressure turbine disc.

The European Aviation Safety Agency, in a proposed directive, says an analysis of material conditions used in the manufacturing of the parts found that the cover plate "may have a safe life below its declared safe cyclic life".

It says that this could potentially lead to premature failure of the component, and possible damage to the engine.

Rolls-Royce has issued a service bulletin detailing instructions to replace the parts.

EASA is proposing to order removal of parts which have exceeded 865 cycles since being installed. It is inviting comments on the proposal until 24 July.

Rolls-Royce is still addressing Trent 1000 reliability issues centred on durability of compressor blades within the powerplant.

Source: Cirium Dashboard