(2)
Using ACARS, information may be transmitted from the airplane (while in flight) to a receiving station on the ground. Similarly, data may be transmitted to the airplane from a ground station
B. MAWEA Interface (Fig. 78)
(1)
The Modularized Avionics and Warning Electronics Assembly (MAWEA) provides distinguishable audible signals to warn the flight crew of unsafe or abnormal conditions. The MAWEA receives level A warning signals directly from the airplane systems. The MAWEA directs these signals to activate the master warning lights and the cockpit speaker. When the master warning light is reset, a reset signal is sent back to the MAWEA.
(2)
The MAWEA transmits various data to the EIUs such as: airplane identification code, configuration warning, and status word. The EIUs distribute the received MAWEA data to the using systems.
(3)
The EIUs transmit a level B caution signal to turn on the master caution lights. The EIUs also transmit an aural level B caution signal to the MAWEA for the audible warning. Resetting the master caution light to turn off the light also transmits a reset signal back to the EIUs.
C. DFDAC Interface (Fig. 79)
(1)
An ARINC 429 digital data bus is used as an output from each EIU to the Digital Flight Data Acquisition Computer (DFDAC).
(2)
Selected engine data and other miscellaneous data is sent to the DFDAC on this high speed data bus.
D. ACESS Interface (Fig. 80)
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(E2-3)
M7352 C-EIU (E2-6)
SAME INPUTS AS L-EIU
Ice/Rain Protection System Interface
Figure 74
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M7351 R-EIU (E2-6)
Auxiliary Power Unit (APU) Interface Figure 75
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-ZERO FUEL WEIGHT -CENTER OF GRAVITY -GROSS WEIGHT -ZERO FUEL CENTER
WBC-A-A-1
OF GRAVITY -DISCRETE DATA -MAINT DATA -STATUS WORD
B7110 WEIGHT AND BALANCE COMPUTER (E2-4)
Weight and Balance System Interface
Figure 76
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M7351 R-EIU (E2-6)
ACARS Interface
Figure 77
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本文链接地址：747-400 AMM 飞机维护手册 指示/记录系统 2(103)
