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Functional Description
The IFSAU contains two printed circuit cards. The A1 card is the
autopilot card. The A2 card is the flight instrument card.
The A1 card contains electronic components to do these
operations:
* Supply 26v ac sensor power
* FCC mach trim selection
* DC bus isolation
* Navigation transfer
* Autoland transfer
* Autoland warning logic.
The A2 card contains electronic components to do these
operations:
* VOR/ILS test inhibit
* ADIRU warning/crew call horn
* Right ADIRU five minute power off delay after AC loss
* Isolation diodes.
See the ADIRS section for more information on the operation of
the IFSAU. (SECTION 34-21)
DFCS - INTEGRATED FLIGHT SYSTEM ACCESSORY UNIT
EFFECTIVITY
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DFCS - INTEGRATED FLIGHT SYSTEM ACCESSORY UNIT
DFCS - INTEGRATED FLIGHT SYSTEM ACCESSORY UNIT
EFFECTIVITY
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Purpose
As the airplane speed gets very fast, the center of lift moves aft
and the airplane starts to nose down. This is mach tuck. One
purpose of the mach trim actuator is to trim the elevator at these
high speeds to raise the nose to correct for mach tuck.
The other purpose of the mach trim actuator is to move the
elevator when the airplane is in the FCC controlled neutral shift
region (FCNSE). This region occurs when the flaps are not in the
up position and either engine N1 is more than 20%. This
increases the elevator movement during takeoff.
Physical Description
The mach trim actuator is 9.3 inches long, 4.8 inches wide and
4.0 inches high. The output shaft can move about .5 inches.
Location
The mach trim actuator is on the top of the elevator feel and
centering unit. When the actuator moves, it causes the feel and
centering unit to turn.
Functional Description
An electric motor turns a gear train that causes the output shaft
to move in and out. There is an electric brake that holds the
output shaft when the motor is not on. A synchro is on the gear
train and an electrical signal tells the FCCs the position of the
output shaft.
The motor operates with 115v ac 400 Hz power to the fixed
phase motor windings. When the motor gets 36v ac 400 Hz
power to the phase control winding, it will turn.
Before the motor turns, the brake windings must get 28v dc to
release the brake. When you remove power from the control
windings, you also remove power from the brake windings. This
immediately stops the motor.
When the position synchro gets 26v ac 400 Hz power, an output
voltage goes to the FCCs to show the position of the mach trim
actuator.
DFCS - MACH TRIM ACTUATOR
EFFECTIVITY
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DFCS - MACH TRIM ACTUATOR
DFCS - MACH TRIM ACTUATOR
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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General
The purpose of the takeoff/go-around (TO/GA) switch is to set
the takeoff or the go-around mode for these systems:
* Autothrottle (A/T) system
* Stall management yaw damper (SMYD) system
* Digital flight control system (DFCS).
There are two TO/GA switches on the control stand. One switch
is on each thrust lever. Each switch is a momentary action
pushbutton switch.
Physical Description
The TO/GA switch is approximately 2.5 inches long, 1.1 inches
wide, and .9 inches deep.
DFCS - TAKEOFF/GO-AROUND SWITCH
EFFECTIVITY
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DFCS - TAKEOFF/GO-AROUND SWITCH
DFCS - TAKEOFF/GO-AROUND SWITCH
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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