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United 232

Printed page 3. PDF page 9.

to manipulate the flight controls. The check airman attempted to use engine power to control pitch and roll. He said that the airplane had a continuous tendency to turn right, making it diffi<;ult to maintain a stable pitch attitude. He
Open official document at PDF page 9United Airlines Flight 232, McDonnell Douglas DC-10-10, Sioux Gateway Airport, Sioux City, Iowa, July 19, 1989

United 232

Printed page 118. PDF page 124.

pitch the nose up and a decrease In thrust wlll pitch the nose down. Consequently, to control pitch osclllatlons with wing engine thrust changes, It Is necessary to apply power Just as the nose Is coming down, and to retard
Open official document at PDF page 124United Airlines Flight 232, McDonnell Douglas DC-10-10, Sioux Gateway Airport, Sioux City, Iowa, July 19, 1989

United 232

Printed page 119. PDF page 125.

lower altitudes. Jam accelerations followed by rapid throttle chops may be necessary to control pitch without generating additional pitch oscillations as a sustained thrust input would do. If asymmetric thrust is required to keep the wings level, a rolling tendency
Open official document at PDF page 125United Airlines Flight 232, McDonnell Douglas DC-10-10, Sioux Gateway Airport, Sioux City, Iowa, July 19, 1989

United 232

Printed page 121. PDF page 127.

and roll axis. (If the ailerons were not trtrrimed and the $tablllzer was not used to control pitch, the con- dition would be Identical to the Sioux City aircraft.) It Is this control that will be dis- cussed below: 2.1
Open official document at PDF page 127United Airlines Flight 232, McDonnell Douglas DC-10-10, Sioux Gateway Airport, Sioux City, Iowa, July 19, 1989

United 232

Printed page 122. PDF page 128.

pitch-control. As In the case with no hydraulics, the throttles are used in the same manner to control pitch (that Is an aggressive advance just as the nose is coming down, or a rapid retard just as the nose begins
Open official document at PDF page 128United Airlines Flight 232, McDonnell Douglas DC-10-10, Sioux Gateway Airport, Sioux City, Iowa, July 19, 1989

United 232

Printed page 120. PDF page 126.

advancing the power and allowing the aircraft to pitch up. Remember that the power Is not controlling speed, so only enough thrust should be used to Initiate a climb at moderate pitch attitude. Too much pitch could cause the stick
Open official document at PDF page 126United Airlines Flight 232, McDonnell Douglas DC-10-10, Sioux Gateway Airport, Sioux City, Iowa, July 19, 1989