Bangladesh, Aug. 18 -- The proposed airworthiness directive applies to select Boeing 787-8, 787-9, and 787-10 aircraft powered by Rolls-Royce Trent 1000 engines. The FAA estimates 22 US-registered aircraft would be affected by the rule.

The issue involves the left fan cowl of the aircraft's right engine. Boeing determined that existing protection does not adequately shield several oil lines from debris that could be released during an uncontained rotor failure in the left engine.

The FAA cautioned that such debris could damage the right engine and potentially result in an in-flight dual engine shutdown.

Boeing flagged the issue to the FAA and developed corrective changes. The manufacturer issued a Special Attention Requirements Bullet...