When a Boeing 747 fell 31,500 feet, the autopilot masked the impending disaster.
In short: On February 19, 1985, China Airlines Flight 006 experienced a routine engine failure that spiraled into a terrifying 31,500-foot plunge. As the aircraft rolled and dived through clouds, the crew became spatially disoriented, unaware that their reliance on the autopilot had effectively hidden the loss of control from them.
The incident began ten hours into a flight from Taipei to Los Angeles when the Boeing 747SP’s No. 4 engine lost thrust. This was a recurring mechanical issue that had failed to be resolved despite multiple maintenance attempts, including fuel filter replacements and vane controller inspections. As the airspeed dropped, the autopilot struggled to maintain level flight, eventually reaching its maximum aileron limit. Because the autopilot does not control the rudder during cruise, it could not counteract the asymmetrical forces created by the failing engine. The captain failed to manually apply the necessary left rudder input, allowing the plane to roll 60 degrees to the right.
Once the captain disconnected the autopilot, he and the first officer encountered a disorienting environment within the cloud cover. Seeing extreme bank and pitch readings on the attitude indicators, the captain incorrectly assumed the instruments were faulty. The aircraft plummeted for under two-and-a-half minutes, subjecting those on board to forces as high as 5 g. It was only after breaking through the clouds at 11,000 feet that the captain regained his orientation and leveled the plane at 9,500 feet. While the crew initially believed all four engines had failed, the National Transportation Safety Board later confirmed only the No. 4 engine had flamed out.
The structural toll was severe: the wings were permanently bent upward by 2 inches, and large sections of the horizontal stabilizer were ripped away. Despite the damage, the aircraft landed safely in San Francisco. The NTSB’s 1986 report concluded that the captain’s distraction with the engine malfunction and his over-reliance on the autopilot were primary causes of the accident. The plane remained in service for years, eventually being repurposed for humanitarian aid before being grounded in 2005. The flight number itself saw a complex history of retirements and reintroductions, reflecting the operational demands of the Taipei–Los Angeles route until its final retirement in December 2025.
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- Summary by Intellect · source: China Airlines Flight 006
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