2) A thermal anti-ice (TAI) readout is shown above the left or right N1 display when the respective engine inlet TAI system is activated.
(d) EGT Indicators
1) Actual exhaust gas temperature (EGT) is indicated by both an analog EGT pointer and digital readout. The maximum EGT exceedance readout is shown beneath the respective actual EGT readout for each engine.
2) An EGT Hot Start Limit is displayed on the EGT scale during engine start. When actual EGT exceeds the hot start limit, the analog pointer changes to red in color (Ref 77-21-00).
(e)
In-Flight Start Annunciations
1) An IN FLT START envelope in table form is also shown. This table lists airspeed for the present and next two lower two thousand foot interval flight levels where start is possible.
(f)
Alert messages are automatically shown in the upper left corner of the display when necessary. These messages are discussed in a later section.
(g)
Secondary Data Cue
1) The secondary data cue is present whenever data is being displayed on the bottom display unit. This includes both when an exceedance is automatically displayed and when the ENGINE switch is pressed to select the engine page. The data cue protects against loss of data display when a display unit fails in a way that might go undetected by the EICAS computers.
(2) Secondary Engine Parameters (Fig. 3)
(a)
The secondary engine page is shown on the bottom display unit. Oil pressure, temperature, and quantity, engine vibration, N2, N3, and Fuel Flow (FF) are displayed for each engine.
(b)
The bottom display unit is normally blank. If an exceedance condition occurs for either engine for N2, N3, or vibration, both displays for the respective parameter automatically come on. If it occurs for either engine for oil pressure or temperature, all oil parameters for both engines are automatically displayed.
(c)
Status Cue
1) A STATUS cue appears in the upper left corner when a new status message has been generated and maintained for 15 seconds. These status messages will be discussed in a later section. This cue only appears if the status page is not already selected for display. The status cue will disappear as soon as the status page is selected.
(d)
Oil Parameter Indicators
1) The engine oil parameters are shown in a vertical scale format. Actual values are shown by both analog pointers and by digital readouts.
ú
31-41-00
ALL ú ú 13 Page 12 ú Jan 28/02
A
757
MAINTENANCE MANUAL
(e) Engine Vibration Indicators
1) Engine vibration indicators are also shown in a vertical scale format. Actual values are shown by both analog pointers and digital readouts.
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 仪表 CHAPTER 31 - INSTRUMENTS 2(18)
