MACH OVERSPEED
WARNING/STICK
PULLER—ALL
AIRPLANES EXCEPT
MODEL 23
GENERAL
The stick puller system provides audible over-
speed warning and noseup elevator through the
autopilot pitch servo in the event airspeed reach-
es M
MO
(.82 Mach).
The stick puller utilizes the autopilot pitch axis
circuitry to control the elevator servo force
applied. The resultant noseup force on the con-
trol column during puller actuation is approxi-
mately 18 pounds. If the autopilot is engaged,
puller actuation cancels any selected flight direc-
tor pitch modes and inhibits autopilot use of the
pitch servo until the puller is released. System
control circuits require 28 VDC supplied
through the L STALL WARN circuit breaker.
Power for the stick puller system is controlled
through the L STALL WARNING switch. The
system will be inoperative if the switch is in the
OFF position.
OPERATION
The overspeed warning horn is functional when-
ever the airplane electrical system is powered
and either WRN LTS circuit breaker is closed.
The stick puller system becomes functional
when the L STALL WARNING switch is turned
on. The STALL WARNING switches should
remain on at all times in flight except as indicat-
ed in the approved AFM. With the stick puller
inoperative, speed is limited to 0.74 Mach on
airplanes with a Century III wing. On airplanes
with a MKII or standard wing, an inoperative
stick puller limits the airplane to 30,000 feet
or below.
TEST
With the BATTERY switch(es) on, test the stick
puller by placing the L STALL WARNING
switch on and actuating the MACH TEST switch
on the test switch panel.
DIFFERENCES
WHEEL MASTER SWITCH
Depressing the wheel master switch performs
the following functions:
Model 23
• Interrupts normal pitch, roll, and yaw trim
while depressed
• Disengages the autopilot
•Permits maximum of 10º nosewheel steer-
ing on the ground
• Interrupts yaw damper (while held
depressed)
• Centers nose gear when airborne if gear is
extended and switch is held
Airplanes SNs 24-100 and
Subsequent, and 25-003 and
Subsequent
• Disengages the autopilot
• Permits maximum of 10º nosewheel steer-
ing (Nonvariable-authority airplanes)
• Disengages steer lock function
• Disengages the yaw damper
• Interrupts pusher and puller while
depressed
• Interrupts normal and emergency pitch
trim while depressed
• Centers nose gear when airborne if gear is
extended and switch is held
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