Summary
The FAA proposes to supersede an existing airworthiness directive (AD) for Rolls-Royce plc (RR) RB211 Trent 875, 877, 884, 892, 892B, and 895 series turbofan engines. That AD currently requires repetitive application of dry film lubricant (DFL) to low pressure compressor (LPC) fan blade roots. This proposed AD would require the same actions but at more frequent intervals than the existing AD, add the Trent 884B engine to the list of engine models affected, add a fan blade part number (P/N) to the affected list of fan blades, and would relax the initial DFL repetitive application compliance time for certain fan blades that have never been removed from the disk. This proposed AD results from discovering DFL in worse condition than anticipated on fan blades fitted to disks previously run for a significant period. This proposed AD also results from the need to update the list of engine models affected, and to update the list of fan blade part numbers affected. We are proposing this AD to prevent LPC fan blade loss, which could result in an uncontained engine failure and possible aircraft damage.