Boeing 747-400, 9M-MPL
A passenger saw what appeared to be small flames coming from between the No 1 engine exhaust shroud and its pylon; the flight crew were informed. The engine indications were normal; nevertheless, the commander decided to shut the engine down. The ‘flames’ continued until the aircraft was slowed for an approach. The aircraft landed uneventfully. Investigation revealed that a rubber seal had torn, and that when agitated by the air flow it gave the appearance of flames. There had been eleven previous events reported on similar aircraft. The aircraft manufacturer has identified an alternative seal and recommended that operators inspect the affected area on a periodic basis and replace damaged seals.
Boeing 747-400, 9M-MPL 12-06.pdf (733.44 kb)