(c)
The EICAS displays MCDP data the same as the MCDPs display. In addition to the normal display, the EICAS also displays the following: 1) MCDP OFF if CONFIG/MCDP switch is selected and the MCDP is
off.
2) MAINT DATA DSPLY to indicate that maintenance data is being displayed. The MCDP mode message MCDP FLT FAULTS or MCDP GRD TEST is displayed below the MAINT DATA DSPLY message.
(5) MCDP Flight Faults Mode (Fig. 4)
(a) The MCDP receives flight fault data from six computers (3 FCC, 2 FMC, 1 TMC). The data is received on ARINC 429 data buses. Automatic transfer of flight fault data to the MCDP occurs when the following conditions are met: 1) either air/ground relay indicates an on-ground condition, 2) a successful automatic power-up and self-test of the MCDP is completed, 3) the Inertial Reference Unit (IRU) senses a ground speed of less than 40 knots. The IRU cannot be in the functional test mode or have the in-flight flag set.
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EICAS MAINT EVENT
DISPLAY SELECT AUTO READ MAN
MCDP ECS ELEC PERF
UP YES/ADV GND TEST ON/OFF MSG HYD APU
REC ERASE
TEST
DOWN NO/SKIP FLT FAULTS CONF ENG
REMOTE HANDHELD MCDP PANEL MCDP EXCD
CONNECTOR ON P61 PANEL
EICAS MAINTENANCE PANEL
PILOT'S DISPLAY SELECT PANEL
PART NO. S242N701-XXX 2 ENGINE CONFIGURATION
EICAS TMC
3 FMC
EEC
PROGRAM PINS 11
8C25 110232 MAINT DATA DISPLAY
1 PROGRAM PINS DEPEND EICAS MCDP FLT FAULTS
ON AIRPLANE OPTIONS COMPUTERS 01 A/P CTN
2 "XXX" INDICATES EICAS ADC LCOMPUTER DASH NUMBER
3 DISPLAYS ENGINE TYPE INSTALLED
LOWER EICAS DISPLAY
POWER MODE
XX
"
MCDP Remote MCDP Operation Figure 6
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(b) Each computer transmits flight fault data to the MCDP on an ARINC 429 data bus in a block of eight 32-bit words. The data block from each computer is initially stored in a Random Access Memory (RAM) until all valid computers have transmitted their fault data. After all the fault data is received, it is run through a fault consolidation routine and stored in non-volatile memory (EAROM). The MCDP can store up to 10 fault flight segments for a total of 350 flight faults. Each word in the data block is labeled either 356 for fault data and ground test data or 357 for interface fault data. The label 357 interface fault data is only acquired during ground test.
(6) MCDP Flight Fault Input Data Block (Fig. 7)
OCTAL
PARITY LABEL
(32)(31)(30) (29) (28) (27) (26) (25) (24)(17) (16)(9) (8) (1)
1ST WORD 1ST FAILURE (29) (28) (26) (25) (24) (17) (16) (9)
P 0 0 2ND FAILURE
P 0 0 5TH FAILURE
(9)
P 0 0 ACTIVITY MONITORS (FAULT CONSOLIDATION)
P 1 0 SPARE
NOTE: CODES SHALL BE 2'S COMPLEMENT BINARY DATA WITH MSB ON LEFT MCDP Flight Faults Input Data Block Figure 7
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(a) The label 356 word format consists of a block of eight words. All eight words must be present for the MCDP to accept the data. 1) Word one is a general information word that informs the 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：757 AMM 飞机维护手册 自动飞行 AUTOFLIGHT 2(161)
