737 Operations Manual
Non-Normal Checklists -
Flight Controls
Copyright © The Boeing Company. See title page for details.
D6-27370-400E-TBCE NNC.9.17
MACH TRIM FAIL
Condition: The MACH TRIM FAIL light illuminated indicates
failure of the mach trim system.
Limit airspeed to .74 Mach.
RUNAWAY STABILIZER
Condition: Continuing rotation of the stabilizer trim wheel in a
manner not appropriate for flight conditions.
CONTROL COLUMN. . . . . . . . . . . . . . . . . . . . . . HOLD FIRMLY
AUTOPILOT (if engaged). . . . . . . . . . . . . . . . . . . .DISENGAGE
Do not re-engage the autopilot.
Control airplane pitch attitude manually with control
column and main electric trim as required.
If runaway continues:
STABILIZER TRIM CUTOUT
SWITCHES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CUTOUT
If runaway continues:
STABILIZER TRIM WHEEL . . . . . . . . . . . . .GRASP & HOLD
STABILIZER . . . . . . . . . . . . . . . . . . . . . . . .TRIM MANUALLY
Anticipate trim requirements.
Complete the normal DESCENT-APPROACH and
LANDING checklists.
Establish proper airspeed and in-trim condition early on
final approach.
December 06, 2002
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