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T BITE ACCESS
80 SHZ ALL
22-31-00 A/T SYSTEM - TRAINING INFORMATION POINT - A/T BITE PAGES -
CURRENT STATUS TEST
82 SHZ ALL
22-31-00 A/T SYSTEM - TRAINING INFORMATION POINT - A/T BITE PAGES -
CURRENT STATUS ENGINEERING DATA
84 SHZ ALL
22-31-00 A/T SYSTEM - TRAINING INFORMATION POINT - A/T BITE PAGES - A/
T INFLIGHT FAULTS
86 SHZ ALL
22-31-00 A/T SYSTEM - TRAINING INFORMATION POINT - A/T BITE PAGES -
INTERACTIVE TEST 1
88 SHZ ALL
22-31-00 A/T SYSTEM - TRAINING INFORMATION POINT - A/T BITE PAGES -
INTERACTIVE TEST 2
90 SHZ ALL
22-31-00 A/T SYSTEM - TRAINING INFORMATION POINT - A/T BITE PAGES -
INTERACTIVE TEST 3
92 SHZ ALL
22-31-00 A/T SYSTEM - TRAINING INFORMATION POINT - A/T BITE PAGES -
INTERACTIVE TEST 4
94 SHZ ALL
22-31-00 A/T SYSTEM - TRAINING INFORMATION POINT - A/T BITE PAGES -
INTERACTIVE TEST 5
96 SHZ ALL
22-31-00 A/T SYSTEM - TRAINING INFORMATION POINT - A/T BITE PAGES -
IDENT/CONFIG
98 SHZ ALL
22-31-00 A/T SYSTEM - SUMMARY 98.2 SHZ ALL
22-CONTENTS
Page 12
D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
CHAPTER 22
Autoflight
General
The digital flight control system (DFCS) does these functions:
* Autopilot
* Flight director
* Altitude alert
* Speed trim
* Mach trim.
The DFCS has a mode control panel (MCP), two flight control
computers (FCC), and actuator inputs to the flight control
system. Each FCC can do all of the five functions.
Autopilot
The FCCs get inputs from several systems such as the air data
inertial reference system (ADIRS) and the flight management
computer (FMC) and sends commands to the aileron and
elevator actuators. These actuators control the movement of the
ailerons and elevators, which control the flight path of the
airplane. There are two autopilots, autopilot A from FCC A and
autopilot B from FCC B. When you engage an autopilot from the
MCP, the autopilot controls the airplane attitude through these
phases of flight:
* Climb
* Cruise
* Descent
* Approach
* Go-around
* Flare.
Flight Director
The FCCs get inputs from several systems and send flight
director commands to the common display system (CDS) to
provide guidance for the pilots. When the MCP flight director
switches are on, the flight director display shows on the
common display system (CDS). The flight crew can use the
flight director commands to control the attitude of the airplane.
The flight director commands do not show at flare.
Altitude Alert
As the airplane gets near or flies away from the MCP selected
altitude, an alert occurs. This alert warns the pilots that they are
getting near or leaving the MCP selected altitude. This warning
occurs with or without the autopilots engaged or the flight
directors on.
Speed Trim
When the engine thrust is high and the airspeed is low, the
speed trim function keeps the speed set by the pilots with
commands to the horizontal stabilizer. This function primarily
occurs during takeoff and only operates when the autopilots are
not engaged. The flight directors may be on or off.
DIGITAL FLIGHT CONTROL SYSTEM - INTRODUCTION
EFFECTIVITY
SHZ ALL 22-11-00
Page 1
D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-001
Mach Trim
As the speed of the airplane increases, the nose starts to drop.
This is called mach tuck. When the airplane airspeed is more
than mach 0.615, the mach trim function gives an up elevator to
keep the nose of the airplane level. This function operates with
or without the autopilot engaged or the flight director on.
Abbreviations and Acronyms
* AAM - autopilot actuator monitor
* ac - alternating current
* accel - acceleration
* actr - actuator
* ACQ - acquire
* ADIRS - air data inertial reference system
* ADIRU - air data inertial reference unit
* ADR - air data reference
* AFCS - automatic flight control system
* AFDS - autopilot flight director system
* AGS - air/ground system
* AI - attitude indicator
* ail - aileron
* alt - altitude
* ALT - alternate
* ANN - annunciator
* annun - annunciator
* ANT - antenna
* AOC - approach-on-course
* A/P - autopilot
* APP - approach
* ARINC - Aeronautical Radio Incorporated
* A/S - airspeed
* ASA - autoflight status annunciator
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