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 2)  A rotor identification readout is located above the actual vibration readout. EICAS will automatically select and display the rotor with the most severe vibration. If any rotor vibration sensor should fail, EICAS will display an overall broad band (BB) vibration value for that engine.
 (f) N2, N3 Indicators
 1)  N2 and N3 compressor rotor speeds are shown in a round dial format. Maximum rpm exceedance readouts are located below the actual rotor speed digital readouts.
 2)  An In-flight-start windmilling "FUEL ON" cursor appears on the analog N3 scale during ground start or inflight XBLD start. In flight, it is displayed in conjunction with the in-flight start annunciators on the primary engine format and always indicates the minimum N3 required for FUEL ON. If crossbleed action is required, an X-BLD readout appears above the N3 indicator.
 (g) Fuel Flow Indicators
 1)  The rate of fuel flow for each engine is shown in round dial format. Actual values are shown as both pointers and digital readouts.
 (3) Exceedance Operations
 (a) Primary Engine Parameters
 1)  Red band exceedance areas are displayed at the upper end of the analog scales for N1 and EGT. If an actual value pointer reaches or exceeds the red band area, the pointer and digital readout become red in color.
 2)  The highest red band exceedance reached is displayed in white digital form below the actual digital readout. This maximum exceedance can be cleared from the display using the MAX IND RESET button only if the exceedance no longer exists.
 3)  The N1 and EGT indicators also have a yellow band exceedance area. This area is at the upper end of the scale immediately below the red line. If the actual value pointer enters the yellow band area, both the pointer and digital readout become yellow in color.
 (b) Secondary Engine Parameters
 1)  When a yellow band exceedance area is entered by any secondary engine parameter, automatic display of that parameter occurs. The yellow band and red band color changes for secondary parameters operate the same way as the primary engine parameters.
 2)  N2 and N3 exceedance limits operate the same way as the primary (N1 and EGT) parameter limits. N2 and N3 also have maximum red band exceedance readouts.
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 3)  The oil pressure indicators have lower level red band and yellow band limits. The yellow band limits vary as a function of N3 speed (Ref 71-00-00). When an oil pressure exceedance has been reached, all oil parameters are automatically displayed.
 4)  The oil temperature display has three exceedance band limits as shown in the table that follows. All oil parameters will automatically show when a temperature exceedance occurs. ~.............................................. | OIL TEMPERATURE EXCEEDANCE BANDS LIMIT (°C)| ................................................ | red upper level | 170 | | yellow upper level | None | | yellow lower level | 0 | | red lower level | -40 | 2...................................…..........1
　
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本文鏈接地址：757 AMM 飛機(jī)維護(hù)手冊(cè) 儀表 CHAPTER 31 - INSTRUMENTS 2(19)