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Printed page v. PDF page 6.
discharge of stage 1 fan rotor assembly parts from the No. 2 engine led to the loss of the three hydraulic systems that powered the airplane's flight controls. The flightcrew experienced severe difficulties controlling the airplane, which subsequently crashed duringOpen official document at PDF page 6United Airlines Flight 232, McDonnell Douglas DC-10-10, Sioux Gateway Airport, Sioux City, Iowa, July 19, 1989
Printed page 66. PDF page 72.
control if a catastrophic in-flight event in the ! empennage of the airplane damage~ all three hydraulic systems. The i enhancements consist of three separate installations: (1) an electrically ' :1 operated shutoff valve in the supply line and aOpen official document at PDF page 72United Airlines Flight 232, McDonnell Douglas DC-10-10, Sioux Gateway Airport, Sioux City, Iowa, July 19, 1989
Printed page 72. PDF page 78.
City accident--the failure of the No. 2 (center) engine and the loss of fluid for all three hydraulic systems. The DC-10 simulator used in the study was programmed with the aerodynamic characteristics of the accident airplane that were validatedOpen official document at PDF page 78United Airlines Flight 232, McDonnell Douglas DC-10-10, Sioux Gateway Airport, Sioux City, Iowa, July 19, 1989
Printed page 73. PDF page 79.
uncontained stage 1 fan rotor assembly parts from the No. 2 engine 1ed to the lass of the three hydraulic systems that powered the airplane's flight controls. The flightcrew experienced severe difficulties controlling the airplane and used differential power fromOpen official document at PDF page 79United Airlines Flight 232, McDonnell Douglas DC-10-10, Sioux Gateway Airport, Sioux City, Iowa, July 19, 1989
Printed page 75. PDF page 81.
Consequently, the No. 2 engine failure precipitated severe damage that breached the three hydraulic systems, leaving the flight control systems inoperative. Titanium alloy was found on the fracture surfaces of severed lines of hydraulic systems No. 1 and No. 3Open official document at PDF page 81United Airlines Flight 232, McDonnell Douglas DC-10-10, Sioux Gateway Airport, Sioux City, Iowa, July 19, 1989
Printed page 76. PDF page 82.
satisfactorily in a DC-10 simulator was the procedure for managing the failure of two of the three hydraulic systems; however, during this training, the remaining system.was available for movement of the flight controls. . ' The CVR recorded the flightcrew'sOpen official document at PDF page 82United Airlines Flight 232, McDonnell Douglas DC-10-10, Sioux Gateway Airport, Sioux City, Iowa, July 19, 1989