A 747-400 MAINTENANCE MANUAL
747-400 MAINTENANCE MANUAL
CHAPTER 45 - CENTRAL MAINTENANCE COMPUTER SYSTEM
TABLE OF CONTENTS
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Chapter Section Subject_______ Subject ____ Effectivity
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CENTRAL MAINTENANCE COMPUTER SYSTEM 45-10-00
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Component Location 101 ALL
Component Index
Component Location
45-CONTENTS
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A
747-400 MAINTENANCE MANUAL
CENTRAL MAINTENANCE COMPUTER SYSTEM - DESCRIPTION AND OPERATION
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1. General_______
A. The CMCS collects, stores, and displays maintenance information generated by line replaceable units (LRUs). The CMCS also provides a central location to initiate system BITE tests. The Central Maintenance Computer System (CMCS) interfaces with all major avionics, electrical, and mechanical systems installed on the airplane.
B. The CMCS provides fault consolidation to combine multiple fault indications when a single fault is reported by multiple subsystems. Approximately 6500 CMCS fault messages can be generated, and up to 500 of these messages can be stored in CMCS memory.
C. The CMCS consists of two central maintenance computers (CMCs), two ground test switches, eight enable relays, and one multiple-input or full-format printer (Fig. 1).
D. The primary crew interface with the CMCS is through the control display units (CDUs) which are part of the Flight Management Computer System (FMCS) (AMM 34-61-00/001). The CMCS also works in close conjunction with the IDS Integrated Display System (IDS) (Ref 31-61-00/001). (Fig. 2)
E. The data loader is used to load the CMC software and the CMCS airline data base (AMM 45-10-10/201).
F. Electrical power is supplied by the Electrical Power System
(AMM 24-00-00/001). (Fig. 3)
G. The CMCS interface with most airplane systems consists of test initiation commands being sent to the individual LRUs, and test results being sent back to the CMCS for storage and display. In addition, the CMCS receives fault data detected by continuous BITE monitoring within LRUs.
H. The CMC interface with airplane systems is classified as either direct or indirect. In the direct interface, the CMCs send test initiation commands to the airplane system LRUs, and the test results are transmitted directly back to the CMCs. In the indirect interface, the LRUs send test results through the EIUs, which then pass the appropriate data to the CMCs (Fig. 2). The same types of interface (direct or indirect) are used to transmit results of continuous fault monitoring performed by airplane LRUs.
I. The CMC incorporates an option code feature which enables functions in the CMC that are required for the various airplane options. The option code is entered with the CDU keyboard. An option code must be installed in the CMC to allow CMCS operation.
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747-400
MAINTENANCE MANUAL
P461 PANEL
SEE A
GND TESTS
NORM
ENABLE
GROUND TEST SWITCH
A P8 PANEL
P9 PANEL
SEEB C
SEE B
FLIGHT COMPARTMENT
FAIL
LOW PAPER
RESET
INIT
REF
DEP
BRT
RTE VNAVARR EXECFIX LEGS HOLD PROG
NAVMENU TESTRAD A
B C D E
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F G H I J
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PAPER
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SLEW
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LEFT, RIGHT, OR CENTER FULL-FORMAT PRINTER
CONTROL DISPLAY UNIT C
B
Central Maintenance Computer System - Component Location Figure 1 (Sheet 1)
G28354
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