On 20 July 2021, a Boeing 747-8F experienced a series of problems with an overspeed and fire affecting the left outboard engine soon after takeoff from Hong Kong and although it was shut down, the fire continued until just before landing. About twenty minutes after landing trapped residual leaked fuel then auto-ignited and that fire was quickly extinguished. The origin of the engine malfunction and continuing airborne fire was identified as undetected improper installation of a component in the engine’s Fuel Metering Unit at build which caused a fuel leak that was the sole origin of the engine malfunction.