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that the TRs get their power from the same generator, the 28v
dc buses are not isolated. The bus power control unit knows this
transfer has occurred and sends a bus transfer signal to each
FCC. The signal tells the FCCs that the DC buses cannot be
isolated so the dual autopilot mode is not allowed.
DFCS - POWER TRANSFER INTERFACE
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-014
DFCS - POWER TRANSFER INTERFACE
DFCS - POWER TRANSFER INTERFACE
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-014
General
These components send digital data to the FCCs:
* MMR 1 and 2
* VOR/MB 1 and VOR 2
* DME 1 and 2.
MMR
The FCCs receive digital data from MMR receivers 1 and 2. The
MMR receivers send ILS localizer and glideslope deviation data
to the FCCs to calculate the roll and pitch commands during the
approach mode. The FCCs use localizer deviation data to
calculate the roll commands during a localizer only approach.
VOR/MB
FCC A receives digital data from the VOR/MB 1 receiver. FCC B
receives digital data from the VOR/MB 2 receiver. The VOR
receivers send VOR frequency and VOR omnibearing data to
the FCCs. The FCC uses this data to capture and track a VOR
course during the VOR mode.
DME
FCC A receives digital data from the DME 1 interrogator. FCC B
receives digital data from the DME 2 interrogator. The DME
interrogators sends DME frequency and DME distance data to
the FCCs. The FCCs use the DME frequency to identify the
correct channel and then use the DME distance sent directly
after the correct frequency. The FCCs use DME distance to
calculate a capture point for the VOR course and to determine if
the airplane is over the VOR station.
If DME data is not available, the FCCs will use VOR data to do
the same calculations.
DFCS - FLIGHT CONTROL COMPUTER DIGITAL INPUT INTERFACE-1
EFFECTIVITY
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D633A101-SHZ1 Jun 10/2003
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-015
DFCS - FLIGHT CONTROL COMPUTER DIGITAL INPUT INTERFACE-1
DFCS - FLIGHT CONTROL COMPUTER DIGITAL INPUT INTERFACE-1
EFFECTIVITY
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D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-015
General
These components also send digital data to the FCCs:
* Flight management computer (FMC) 1
* Radio altimeters (RA) 1 and 2
* Stall management yaw damper (SMYD) 1 and 2.
FMC
The FMCS transfer relays are in the BOTH ON L positions. In
this configuration, the FMC sends digital data to FCC A through
FMCS transfer relay 1. The FMC sends digital data to FCC B
through FMCS transfer relay 2. The FMC sends this data to the
FCCs:
* FMC target altitude to calculate VNAV commands
* FMC target airspeed to calculate VNAV commands
* FMC target mach to calculate VNAV commands
* Vertical speed command to calculate VNAV commands
* Greenwich mean time and date to record time of faults in
BITE
* Horizontal command signal to calculate LNAV commands
* Flight number to record inflight faults in BITE
* FMC discrete data to control the DFCS and A/T in VNAV and
LNAV
* BITE test word for BITE information.
RA
RA 1 sends radio altitude data to FCC A. RA 2 sends radio
altitude to FCC B. The FCCs use radio altitude to calculate
these:
* Localizer gains
* Glideslope gains
* Air/ground discrete
* A/T command during flare
* Altitude trip points
* When you can engage the A/P.
SMYD
SMYD 1 sends this data to FCC A:
* Flap angle to compare with flap position data from the flap
position transmitter
* Stick shaker AOA to help calculate the F/D TO/GA command
* FC minimum operating speed to calculate the alpha floor
speed
* SMYD discrete data to show when a stall warning occurs.
SMYD 2 sends the same data to FCC B.
DFCS - FLIGHT CONTROL COMPUTER DIGITAL INPUT INTERFACE-2
EFFECTIVITY
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