(b)  
The left and right flight management computers use ARINC 429 data buses to transmit fault data to the MCDP. The MCDP can receive FMC fault data but not transmit data to the FMC. The MCDP Ground Test 30 is the only ground test that displays FMC faults.

 (c)  
The thrust management computer uses an ARINC 429 data bus for transmitting interface fault data to the MCDP and receiving ground test data from the MCDP. An analog discrete line is used for ground test control of the TMC by the MCDP.

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757
MAINTENANCE MANUAL

Maintenance Monitor System
Figure 1

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MAINTENANCE MANUAL

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Maintenance Control Display Panel Interfacing Systems
Figure 2

A

757
MAINTENANCE MANUAL

 (3)  Secondary Interfaces
 (a)  
The mode control panel supplies control signals and receives status data from each FCC, FMC, and TMC on ARINC 429 data buses.

 (b)  
Each FCC supplies analog control signals to its control servos and receives analog servo position signals. Each FCC receives sensor data on ARINC 429 data buses from the associated Inertial Reference Unit (IRU) and air data computer.

 (c)  
The TMC receives control signals on an ARINC 429 data bus from the thrust mode select panel. The TMC also transmits status data to the thrust mode select panel on an ARINC 429 data bus. The TMC supplies analog control signals to and receives analog position signals from the autothrottle servomotor generator.

 2.  Component Details_________________
 A. Maintenance Control Display Panel (Fig. 3)
 (1)  The MCDP automatically obtains and stores fault data after each landing from each FCC, FMC, and TMC. Maintenance personnel can then interrogate the MCDP to obtain last and previous flight fault data. They can also initiate, select, and conduct MCDP controlled ground tests.
 NOTE: Do not transfer the MCDP directly from another airplane.
____ Historical flight data is valid only for the original airplane installation. The flight data is recorded in the MCDP nonvolatile memory (EAROM) and can only be erased using shop procedures.
 (2)  
The MCDP size is 6 MCU per ARINC 600. Weight is approximately 15 pounds. It uses bottom to top forced air cooling when installed on shelf E3-2 in the main E/E equipment center. The MCDP uses 115 vac, 400 Hz, single phase power from a circuit breaker on panel P11.

 (3)  
The display window contains 32 characters arranged in 2 lines of 16 characters each. Each character, including decimal point, consists of 17 segmented gas discharge lamps. The display uses an English language format.

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MAINTENANCE MANUAL

MESSAGE FLIGHT FAULTS DISPLAY MODE SELECT
POWER ON/OFF
SELECT
SWITCH ADVANCE
GROUND TEST NUMBER SELECT
SWITCH SWITCH (UP SLEW)
GROUND TEST NO/SKIPNUMBER SELECT SWITCHSWITCH (DOWN
SLEW)
INSTRUCTION PLATE

Maintenance Control Display Panel
　
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