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* FMC target airspeed
* FMC target mach number
* Horizontal command
* Vertical speed command
* GMT and date
* Flight number
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* FMC discrete words
* BITE test word.
The FCCs use the altitude, airspeed, mach number, horizontal
commands, vertical commands, and FMC discretes to control
the airplane lateral and vertical flight profile.
GMT and date, flight number, and the BITE test word are used
by the FCC in the BITE function.
SMYD
The SMYDs use this data from FMC 1:
* Gross weight
* Lower buffet margin speeds
* Upper buffet margin speeds
* Landing flap position.
The SMYDs use gross weight to adjust the gain in the yaw
damper command signal. They use all the FMC inputs to
calculate the upper and lower amber bands on the airspeed
indication for CDS. The flap input enables the pitch limit
indication on CDS.
DME
The DME interrogators use four autotune frequencies (channels
2 - 5) from FMC 1.
In normal operation, FMC 1 autotunes the DME interrogators
through the NAV control panels. If a NAV control panel fails, its
on-side DME interrogator is autotuned directly from FMC 1.
Fuel Quantity Processor Unit
The fuel quantity processor unit uses a BITE test word from
FMC 1 to start the BITE program.
Passenger Flight Information System (Airshow)
The passenger flight information system uses this data from
FMC 1:
* Distance-to-go (waypoint).
* Groundspeed
* Origin/destination
* GMT
* Date
* Destination estimated time of arrival (ETA)
* Static air temperature.
It uses this data with other navigation sensors to format and
show flight progress information to the passengers.
FDAU
Navigation data from FMC 1 goes to the FDAU where it is stored
in the solid state memory.
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FMCS - DIGITAL OUTPUT INTERFACE - 1
FMCS - DIGITAL OUTPUT INTERFACE - 1
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General
The FMC data on bus 08 and 09 goes directly to the DEUs. The
other user systems get this data through the transfer relays.
Data Output
The buses 08 and 09 have this data:
* Distance to go (waypoint)
* Groundspeed
* Estimated time of arrival (ETA)
* V speeds
* GPS position data
* Desired track
* Waypoint bearing
* Cross-track deviation
* Range to altitude
* Vertical deviation
* Set landing altitude
* DME elevation
* Transition altitude
* Clean
* Speedbrakes
* FMC navigation source (GPS, VOR, LOC, ADIRU)
* Map background word/block count
* Dynamic data start word
* FMC position
* Track angle (magnetic and true)
* Wind speed and direction
* Drift angle
* Flight path angle
* Alphanumeric display data (wpt, navaids etc.)
* Flight number
* FMC discrete word 2
* FMC discrete word 3.
The FMC discrete word 2 has this data:
* QFE altitude reference
* ADIRU position difference
* Alerts (lateral and vertical)
* Annunciator test
* FMC valid
* Offset
* Dead reckoning.
The FMC discrete word 3 has this data:
* IAS/Mach
* Engine out engaged
* Man N1 select
* Level decel
* A/T to idle arm
* A/T to arm
* FMC vertical speed
* Speed on elevator
* Reduced thrust derate
* Level change request
* VNAV valid
* Thrust cutback enable
* Initiate thrust cutback
* Landing flaps selected
* N1 limit mode.
FMCS - DIGITAL OUTPUT INTERFACE - 2
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-61-00-010
DEU
The DEUs get navigation and flight display data from FMC 1.
There are two types of data, dynamic data and background
data. Dynamic data changes as a function of time while
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