Boeing 737 - UNCOMMANDED YAW OR ROLL; YAW DAMPER

737 Operations Manual
Non-Normal Checklists -
Flight Controls
Copyright © The Boeing Company. See title page for details.
D6-27370-400E-TBCE NNC.9.23
Continued from previous page
If condition was the result of rudder trim or environmental
factors:
YAW DAMPER SWITCH. . . . . . . . . . . . . . . . . . . . . . . . . . .ON
Accomplish the normal DESCENT - APPROACH and
LANDING checklists.
UNCOMMANDED YAW OR ROLL
Condition: Uncommanded yaw or roll occurs in flight.
AUTOPILOT (if engaged) . . . . . . . . . . . . . . . . . . . .DISENGAGE
Maintain control of the airplane with all available flight
controls. If roll is uncontrollable, immediately reduce
pitch/angle of attack and increase airspeed. Do not attempt
to maintain altitude until control is recovered.
AUTOTHROTTLE (if engaged) . . . . . . . . . . . . . . .DISENGAGE
Verify thrust is symmetrical.
YAW DAMPER SWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . OFF
If it is confirmed that the autopilot or autothrottle is not the
cause of the uncommanded yaw or roll, the autopilot and
autothrottle may be re-engaged at the pilot's discretion.
YAW DAMPER
Condition: The YAW DAMPER light illuminated indicates the yaw
damper is disengaged.
YAW DAMPER SWITCH . . . . . . . . . . . . . . . . . . . OFF THEN ON
If light remains illuminated:
YAW DAMPER SWITCH. . . . . . . . . . . . . . . . . . . . . . . . . .OFF
Do not exceed flaps 30 if crosswind exceeds 30 knots.
December 06, 2002