9.12
9.12
Condition: The MACH TRIM FAIL light illuminated indicates
failure of the mach trim system.
Limit airspeed to .74 Mach.
Condition: Continuing rotation of the stabilizer trim wheel in a
manner not appropriate for flight conditions.
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.
MACH TRIM FAIL
RUNAWAY STABILIZER
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
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
9.13
9.13
Condition: The SPEED BRAKE DO NOT ARM light illuminated
indicates a fault in the automatic speed brake system.
Note: Speed brakes may be used in flight.
Complete the normal DESCENT, APPROACH and LANDING
checklists except do not arm speed brakes for landing.
Manually deploy the speed brakes immediately upon
touchdown.
Condition: The SPEED TRIM FAIL light illuminated indicates
failure of the speed trim system.
No crew action required in flight.
Condition: The STAB OUT OF TRIM light illuminated indicates
the autopilot is not trimming the stabilizer properly.
Note: Momentary illumination of the STAB OUT OF TRIM
light during large changes in trim requirements is
normal.
If the stabilizer is not trimming:
CONTROL COLUMN . . . . . . . . . . . . . . . . . . . HOLD FIRMLY
AUTOPILOT . . . . . . . . . . . . . . . . . . . . . . . . . . . .DISENGAGE
STABILIZER TRIM . . . . . . . . . . . . . . . . . . . . . AS REQUIRED
If the stabilizer fails to respond to electric trim inputs:
Accomplish the STABILIZER TRIM INOPERATIVE
checklist.
SPEED BRAKE DO NOT ARM
SPEED TRIM FAIL
STABILIZER OUT OF TRIM
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
9.14
9.14
Condition: The stabilizer fails to respond to electric trim inputs.
MANUAL TRIM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Apply
Apply steady pressure on the manual trim handles until
the desired trim is attained.
If required, use force to cause the disconnect clutch to
disengage. Approximately 1/2 turn of the stabilizer trim
wheel may be needed.
Note: A maximum two-pilot effort on the trim wheels will not
cause a cable or system failure.
Note: Handle should be folded inside stabilizer trim wheel
when not in use.
If the trim wheel moves when released:
STABILIZER TRIM AUTOPILOT
CUTOUT switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . CUTOUT
[Autopilot is not available.]
Maintain in-trim airspeed until the start of the approach.
To reduce the force required to move the stabilizer, use
an airspeed which results in an in-trim condition.
Plan a flaps 15 landing.
Set VREF 15.
Establish landing configuration early.
Note: Anticipate higher than normal elevator forces during
approach and landing.
Note: The thrust reduction at flare will cause a nose down
pitch.
Continued on next page
STABILIZER TRIM INOPERATIVE
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
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