(b)
The MCP has two identical micro-processors, A and B, which perform identical functions. The A processor receives ARINC 429 data from the left and center FCCs, Left FMC, and TMC. The B processor receives ARINC 429 Data from the right and center FCCs and TMC. The A processor transmits ARNIC 429 data to the left and center FCCs and TMC, and the B processor transmits ARNIC 429 data to the right FCC and FMC.
(c)
Each FCC has independent data links with the MCDP.
(3)
FCC Analog Discrete Inputs
(a)
Pin H15 receives 28 vdc from the MCP when the A/P servos are armed. Pin C6 receives 28v dc from the hydraulic system low pressure light, on the P10 panel, when the light is off.
(b)
Pin C7 changes from ground to open after the EPCS has completed Autoland power bus isolation.
(c)
Pin A3 receives a ground from the MCDP when the ground test mode is selected.
(d)
Pins C13, F3, or F1 receive a ground from the air/ground relay when the airplane is on the ground. Two of these three pins for each FCC is wired to the Air/Ground Systems 1 and 2.
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(e)
Pin H2 receives a ground or open when the MAG/TRUE switch is in the TRUE or MAG position respectively.
(f)
Pin H11 receives a ground whenever the A/P DISC switch is pressed.
(g)
Pin F15 (connector B) normally has a ground through both A/P DISC switches (in series) and receives an open whenever either switch is pressed.
(h)
Pin K1 or K3 receives 28 volts SERVO ENG DC from another FCC (from pin G10 output).
(i)
Pin E3 or G1 receives 28 volts DETENT TRIP from another FCC (from pin F9).
(j)
Pins J10 and K10 receive ground whenever the RESET switch is pressed on either ASA.
(k)
Pin G9 on both connectors receive 28 vdc autotrim valid from the Stabilizer Trim/Elevator Asymmetry Limit Module (SAM). The center FCC receives signals from the left and right SAMs. The right and left FCCs interface only with the applicable left or right SAM.
(l)
Pin F10 or F9 receives a ground when the FCC switch on the left or right INSR SOURCE SEL panel selects the center FCC.
(m)
Pin F15 (connector A) normally receives a ground when both go-around (GA) switches are relaxed and an open when either switch is pressed.
(n)
Pins A13, G13, K13, J02 and C13 are program pins.
M. AFDS Switching (Fig. 5)
(1)
Source Select Switches
(a)
The FLT DIR switches on the left and right INSTR SOURCE SEL panels connect the selected FCC computed F/D commands and selected data to the associated EADI.
(b)
The EFI switches on the left and right INSTR SOURCE SEL panels enable the NORMAL or ALTERNATE SG to process incoming AFDS and FMCS data.
(c)
The switches on the left and right INSTR SOURCE SEL panels do not control IRU inputs to FCCs but they do control attitude display signals.
(d)
The AIR DATA switches on the left and right INSTR SOURCE SEL panels do not change the ADC sources to the FCCs.
(2)
MCP Switching
(a) AIRPLANES WITH CONTROL WHEEL STEERING; positioning the captain's or first officer's F/D switch to ON permits the FCCs to compute F/D commands and activates the EADI FMA. These commands can be generated simultaneously by an FCC engaged in CMD mode and CWS mode.
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AFDS DIGITAL OUTPUTS
ARINC FOR ADI DISPLAYS
429
AFDS Data SwitchingFigure 5 (Sheet 1)
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MAINTENANCE MANUAL
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