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MAINTENANCE MANUAL
E. EICAS Electrical Synoptic Display (Fig. 44)
(1)
General
(a)
The electrical synoptic display presents graphic views and parameters for generator control, generator drive disconnect status, bus tie, split system breaker, main bus, electrical power flow, and galley and utility bus status.
(b)
Electrical power flow is indicated by illuminated combinations of green colored flow segments within the bus outlines.
(c)
When autoland status is annunciated on the Primary Flight Display (PFD), the entire electrical synoptic display is replaced by a ELECTRICAL SYNOPTIC INHIBITED FOR AUTOLAND message.
(2)
Split System Breaker
(a) The Split System Breaker (SSB) status is indicated pictorially in the open or closed positions.
(3)
Bus Tie
(a) Bus tie breaker status is indicated by square box symbology. If bus tie breaker 1-4 is open, an amber colored ISLN message is displayed within a box. If bus tie breaker 1-4 is closed, two white colored vertical lines overlay the bus outlines and are enclosed within a box. For invalid bus tie data, the respective bus tie symbol is replaced by a low intensity white box.
(4)
Main Bus
(a) Main bus status is indicated by a colored message and outline. If ac bus 1-4 is on, the bus number message and outline are colored white. If ac bus 1-4 is off, the bus number message and outline are colored amber. For invalid main bus data, the outline changes to low intensity white.
(5)
Galley and Utility Bus
(a) Galley and utility bus status is indicated by the display of an associated message located next to the appropriate main bus indicator. If main bus 1-4 is on and the galley bus 1-4 relay is closed, the GALLEY message is colored green, otherwise, the message is colored amber. If main bus 1-4 is on and the utility bus 1-4 relay is closed, the UTILITY message is colored green, otherwise, the message is colored amber. If galley or utility bus data becomes invalid, the associated message changes to low intensity white.
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MAINTENANCE MANUAL
SPLIT SYSTEM APU POWER BREAKER BUS STATUS (CLOSED) (POWER OFF)
EXTERNAL POWER BUS STATUS (POWER OFF)
BUS TIE BREAKER STATUS (CLOSED)
MAIN BUS STATUS UTILITY BUS
STATUS
GALLEY BUS
STATUS
1
GENERATOR CONTROL STATUS (BREAKER CLOSED)
GENERATOR
DRIVE STATUS
(NORMAL)
FREIGHTERS DO NOT SHOW GALLEY BUS STATUS
EICAS Electrical Synoptic Display Figure 44
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MAINTENANCE MANUAL
(6)
Generator Control
(a) Generator control status is indicated by square box symbology. If generator control breaker 1-4 is open, an amber colored message OFF is displayed within an amber box. If generator control breaker 1-4 is closed, two white colored vertical lines overlay the bus outline and are enclosed within a white box. For invalid generator control data, the associated symbol is replaced by a low intensity white box. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 指示/记录系统 2(78)
