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Printed page 89. PDF page 95.
Safety Board recommends that the FAA encourage continued research and development into backup flight control systems that employ an alternative source of motive power. Additional design precautions could have been taken by Douglas if the potential effect of the distributiOpen official document at PDF page 95United Airlines Flight 232, McDonnell Douglas DC-10-10, Sioux Gateway Airport, Sioux City, Iowa, July 19, 1989
Printed page 102. PDF page 108.
components. (Class II, Priority Action) (A-90-167} Encourage research and development of backup flight control systems ·for newly certificated wide-body airplanes that utilize an alternative source of motive power separate from that source used for the conventional controlOpen official document at PDF page 108United Airlines Flight 232, McDonnell Douglas DC-10-10, Sioux Gateway Airport, Sioux City, Iowa, July 19, 1989
Printed page 17. PDF page 23.
providing hydraulic pressure. ·Either of these pumps can supply full power to its system. Backup power is provided by two reversible motor pumps, which transmit power from one system to another without fluid interconnection. This backup power system activates automaticallyOpen official document at PDF page 23United Airlines Flight 232, McDonnell Douglas DC-10-10, Sioux Gateway Airport, Sioux City, Iowa, July 19, 1989