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* FMC target mach number
* Horizontal command
* Vertical speed command
* Desired track
* Waypoint bearing
* Cross-track deviation
* Vertical deviation
* Magnetic track angle
* Drift angle
* GMT
* Date
* Static air temperature (SAT)
* Selected temperature
* Flight number
* Minimum airspeed
* Minimum buffet airspeed
* Maximum buffet airspeed
* Continuous N1 limit
* Go-around N1 limit
* Cruise N1 limit
* Climb N1 limit
* Target N1
* NDB effectivity
* BITE test word
* FMC discrete word 1
* FMC discrete word 2
* FMC discrete word 3.
* ATC data interface
FMC discrete word 1 has this data:
* Isolation valve open
* Wing antice on
* Cowl-R antice on
* Cowl-L antice on
* ECS pack-R H/L
* ECS pack-L H/L
* ECS pack-R
* ECS pack-L
* Engine bleed 2 on
* Engine bleed 1 on
FMCS - DIGITAL OUTPUT INTERFACE - 1
EFFECTIVITY
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FMC discrete word 2 has this data:
* Lateral alert
* Computer master/slave
* Annunciator test
* FMC valid
* Offset
* Dead reckoning
* Vertical alert.
FMC discrete word 3 has this data:
* IAS/mach
* Engine out engaged
* Landing flaps selected
* Manual N1 select
* Level decel
* Autothrottle to idle arm
* Autothrottle to arm
* FMC vertical speed
* N1 limit mode
* Speed on elevator
* Reduced thrust (derate)
* LNAV takeoff enabled
* Level change request
* VNAV valid
* Thrust cutback enable
* Initiate thrust cutback.
ADIRU
The ADIRUs use this data from FMC 1:
* Set latitude
* Set longitude
* Set heading
* BITE test word.
The ADIRUs use the latitude and longitude data during
alignment. Magnetic heading is used when the ADIRU is in
the attitude mode (ATT) and the BITE test word is used to start
BITE through the CDUs.
Autothrottle
The autothrottle computer uses this data from FMC 1:
* Target N1
* FMC gross weight
* Minimum airspeed
* N1 limit mode
* FMC altitude
* GMT and date
* Static air temperature
* N1 thrust limits (CLB, CRZ, CONT, and GA)
* BITE test words.
The autothrottle computer uses this data to maintain specific
engine N1 targets or airspeeds from takeoff to touchdown.
The autothrottle computer changes the target N1 values to an
equivalent thrust resolver angle (TRA) target. The target N1
rating is dependent on the FMC engaged mode.
FMCS - DIGITAL OUTPUT INTERFACE - 1
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-61-00-009
Gross weight is used in the A/T go-around control logic and
approach control logic.
Minimum airspeed is the lowest airspeed that is acceptable by
the A/T during VNAV operations.
The N1 limit mode discretes are used to determine control law
gains and limits.
FMC altitude is used by the autothrottle computer for
anticipation of altitude acquire during VNAV operation.
GMT and date are used in A/T BITE for fault data storage.
SAT is used by the autothrottle computer to calculate a backup
TRA limit value.
N1 thrust limits are used to limit A/T authority and prevent
possible engine overboost.
DEU
The DEUs use this data from FMC 1:
* N1 limit mode
* Target N1
* Gross weight
* GMT and date
* BITE test words.
The DEUs use this data to show the thrust modes on the center
upper display unit (DU). Target N1 shows on the engine display.
Gross weight is used by the CDS to calculate the flap maneuver
speeds that show on the PFD speed tape. GMT and date are
used in BITE for fault data storage.
Target N1, GMT, and date also go from the DEUs to the engine
electronic controls (EEC). The EECs use the N1 target to
calculate an equivalent TRA for engine control. GMT and date
are used in EEC BITE.
The BITE test words are for the DEUs and these systems:
* Engines (EEC)
* APU (ECU).
There is no direct BITE interface between FMC 1 and the
electronic engine controls (EECs) and the APU ECU. The DEUs
are the interface between the EEC, APU ECU, and the FMC.
FCC
The FCCs use this data from FMC 1:
* FMC target altitude
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