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only if the IRS transfer switch is in the NORMAL position. This is
to prevent a possible ADIRU failure that could cause a pitch and
roll hardover or a yaw damper and elevator hardover.
For dual F/D approach or TO/GA, an IRS switch out of NORMAL
will cause BOV.
VHF Navigation Transfer Switch
If you change the VHF navigation receivers from NORMAL to
BOTH ON 1, FCC B gets VOR/ILS transfer and VOR/ILS
instrument tranfer signals to show the change. If you change the
VHF navigation receivers from NORMAL to BOTH ON 2, FCC A
gets VOR/ILS transfer and VOR/ILS instrument tranfer signals
to show the change.
The DFCS cannot use VOR/ILS data that does not show on the
instruments.
VHF Navigation Control Panel
When you push the frequency transfer switch on the navigation
control panel, a VOR/ILS transfer signal goes to the onside FCC
to show that the VOR/LOC frequency will change. The FCC will
reset the mode if the autopilot is in the VOR/LOC mode. The
autopilot will disengage if it is in the approach mode. The pilot
may select the VOR/LOC mode or reengage the autopilot after
the frequency change.
DFCS - TRANSFER SWITCHES ANALOG INTERFACE
EFFECTIVITY
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DFCS - TRANSFER SWITCHES ANALOG INTERFACE
DFCS - TRANSFER SWITCHES ANALOG INTERFACE
EFFECTIVITY
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Proximity Switch Electronics Unit
When the proximity switch electronics unit gets an input that the
gear is down, it sends a ground to FCC A and B.
Takeoff/Go Around (TO/GA) Switches
When you push either TO/GA switch, a ground goes to these
components:
* Stall management yaw dampers (SMYD) 1 and 2
* Autothrottle (A/T) computer
* FCC A and B.
FCC
There are several program pins that set the airplane
identification and configuration of the FCC. You can ground
some pins when you connect them to a burndy block. Other pins
connect to program switch modules which contain dip switches.
There is an autopilot (A/P) system A program switch module
that connects to several program pins on FCC A. There is an A/
P system B program switch module that connects to several
program pins on FCC B. To ground one of these program pins,
you put the dip switch in the ON position. The OFF position
supplies an open to the program pin.
Each FCC calculates altitude trip points from the radio altimeter
data. When the altitude is less than 10 feet, the FCC sends a
discrete to the thrust reverser (T/R) control valve modules.
When the altitude is less than 800 feet, it sends a discrete to the
spoiler deployment system.
DFCS - MISCELLANEOUS SYSTEMS ANALOG INTERFACE
EFFECTIVITY
SHZ ALL 22-11-00
Page 74
D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-027
DFCS - MISCELLANEOUS SYSTEMS ANALOG INTERFACE
DFCS - MISCELLANEOUS SYSTEMS ANALOG INTERFACE
EFFECTIVITY
SHZ ALL 22-11-00
Page 75
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-027
Purpose
The mode control panel (MCP) supplies the interface between
the flight crew and the digital flight control system (DFCS). The
MCP does these functions:
* Engages the autopilot
* Turns on the flight directors
* Selects the operation mode
* Arms the autothrottle
* Controls parameter selection
* Displays data.
Physical Description
The MCP weighs approximately 15 lbs. The MCP installs in the
glareshield with four screws on the front of the panel. There are
two screws on the bottom of the MCP that also attach to the
glareshield. Three electrical receptacles on the rear of the MCP
connect to the airplane wiring.
Each mode selector switch on the MCP contains six light
emitting diodes (LED). The switches and the LEDs are not line
replaceable units (LRUs).
There are six liquid crystal displays (LCDs). They show these
selected parameter values:
* Course 1 and 2
* IAS/MACH
* Heading
* Altitude
* Vertical speed.
Three lamps give backlight to the five position LCD display. Two
　
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