(b)
The actuator detent signal is sent to the aileron actuator at engagement to hydraulically lock the detent piston against the internal output crank.
(c)
The F/D valid A signal is 28 volts dc used to provide the positive input to the F/D flag and to provide the F/D and pitch in view bias. Standby power transfer relay operation in the flight instrument accessory unit will remove this valid input.
(d)
The ILS test inhibit signal is used to energize a relay in the flight instrument accessory unit which prevents testing of the ILS and radio altimeter systems during the approach mode. This signal, along with an ILS dc voltage controls the switching to the forward LOC antenna.
(e)
The 28 volts dc bar bias signal is used to bias the command bar from view in the event of an FCC F/D malfunction or as a result of undesirable mode conditions.
(5)
Command outputs signals are provided for A/P and F/D.
(a)
The roll transfer valve command signal to the aileron actuator provides aileron movement in response to mode output requirements.
(b)
The roll F/D steering command provides the input to the ADI roll command bar to indicate required pilot action for following FCC generated commands.
L. Roll Channel Digital Interface (Fig. 26)
(1) The digital interface diagram illustrates the various LRU's which provide inputs to and receive outputs from the FCC. These signals are in ARINC 429 format and include validity, sign, address, and data information.
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IRU-L-2IRU-R-3
DADC-L-1 FCC-L-1
M198 DFCS MODECONTROL PANEL (P7) MCP-1
FCC-L-2, FCC-L-3
FMC-01
M923 FLIGHT CONTROLCOMPUTER B (E1-3) DAA-L-2
FCC-R-2, FCC-R-3 M924 FLIGHT CONTROLCOMPUTER A (E1-3)
MAGNETIC HDGROLL ANGLEROLL RATELATERAL ACCEL
M1161 INNERTIAL REFUNIT 1 (E3-5)
SAME AS IRU-1
M1162 INERTIAL REFUNIT 2 (E3-5)
COMPUTED AIRSPEEDALTITUDE
M196 DIGITAL AIR DATACOMPUTER 1 (E1-1)
SELECTED COURSESELECTED HEADINGDISCRETES
M198 DFCS MODECONTROL PANELS (P7)
HORIZONTAL COMMAND
M1175 FLIGHT MANAGEMENTCOMPUTER (E1-2)
DME DISTANCE
M1163 DIGITAL ANALOGADAPTER (E1-2)
CROSS CHANNEL DATA
M923 FLIGHT/CONTROLCOMPUTER B (E1-3)
A 737-300/400/500MAINTENANCE MANUAL
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Roll Channel Digital Interface Block Diagram
Figure 26
A
737-300/400/500MAINTENANCE MANUAL
(2)
The IRU's provide inputs which are FCC internally selected for use. These are magnetic heading, magnetic track angle, roll angle, roll rate, and lateral acceleration. The magnetic heading input is used in the HDG HOLD, HDG SEL and TAKEOFF modes of operation. The magnetic track angle is used in VOR, LOC, and G/A modes. The roll angle is used in all modes of operation and provides an additional input during localizer operation to generate the lag roll signal. The roll rate signal is also used in all modes in the common/inner loop area as a damping signal input. The lateral acceleration is used as a complimenting command during approach.
(3)
The DADC provides computed airspeed which is used to provide gain control of amplifiers in the HDG SEL and TAKEOFF modes and also in the common/inner loop signal chain. The altitude input is used in determining over station sensor logic conditions in the VOR mode.
(4)
The inputs from the MCP are selected course, selected heading, and discretes. The selected course is used as one of the prime guidance signals in the VOR and LOC modes of operation. The selected heading input is used in the HDG SEL and TAKEOFF mode (if wings level option is not selected). The discrete inputs provide the FCC with mode selection information.
(5)
The FMC provides the horizontal command signal used during the L NAV mode.
(6)
The DME distance is used as a comparison to actual altitude in the VOR mode to determine the OSS condition.
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