747-400 AMM 飞机维护手册 指示/记录系统 1(141)

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 C.  There are 23 connectors mounted in the front of the MAWEA chassis which allow the MAWEA to interface with other airplane systems.
 D.  A monitor panel on the front of the unit allows for data monitoring.
 E.  There is an electrostatic jack on the front of the MAWEA which allows for the use of a wrist strap when removing or installing any card. This prevents damage to electrostatic discharges.
 F.  The unit is cooled by convection. Cards in the MAWEA are:
 (1)
Master monitor cards A and B (ULC)

 (2)
Crew alerting card (ULC)

 (3)
Configuration warning card (ULC)

 (4)
Aural synthesizer cards L and R (ASC)

 (5)
Signal collection cards 1 and 2 (SCID)

 (6)
Signal consolidation card 3 (SCID)

 (7)
Signal consolidation card 4 (SCID)

 (8)
Tail identification card (SCID)

 (9)
Stall warning management cards L and R (ULC)

 (10)
 Digital flight data acquisition card (DFDAC)

 G.  The MAWEA processes airplane sensor data and controls the activation of visual, aural and tactile crew alerting devices. Crew alerting devices which interface with the MAWEA are the captain's and first officer's master warning lights, aural warning speakers, stick shakers and the Integrated Display System (IDS).
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747-400
MAINTENANCE MANUAL

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MAWEA CARD FILE
A

MAWEA Component Location
Figure 1

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747-400
MAINTENANCE MANUAL

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Power Supplies Operation
Figure 2

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL

 H.  There are two power supplies in the MAWEA which provide identical inputs to each card in the MAWEA. Power supply A obtains its power from the 115-volt ac standby bus. Power supply B obtains its power from the 115-volt ac first officer's instrument transfer bus. Each power supply sends dc voltages, a ground, and a reset pulse to each card in the MAWEA (Fig. 2).
 2.  MAWEA Monitor Panel (Fig. 3 and 4)
___________________
 A.  The monitor panel on the front of the MAWEA contains:
 (1)  
Jacks for monitoring the ARINC 429 inputs to the MAWEA.

 (2)  
Jacks for monitoring the voltage outputs from the power supplies.

 (3)  
Red lights (2) for power supply failure indication.

 (4)  
Test jacks (4) for L STALL, R STALL, T/O CONFIG, LDG CONFIG tests respectively. These same tests can be initiated by manually grounding the particular jack.

 (5)  
Airplane identification code buttons (9) for selecting the airplane identification code. The code is then sent to the EIUs.

 (6)  
Bus selector switches (2) used to select which system input is to be monitored through the ARINC 429 monitor jacks.

 3.  MAWEA Power Supplies
____________________
 A.  MAWEA has two power supplies that are identical and provide redundant dc inputs to each card in the MAWEA. Two panels, each secured by four screws, must be removed before gaining access to the power supplies.
 4.  MAWEA Printed Circuit Cards
___________________________
 A.  There are four types of cards in the MAWEA:
 (1)  
Universal Logic Cards (ULC)

 (2)  
Aural Synthesizer Cards (ASC)

 (3)  
　
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