(b)  
Pressing the STATUS switch will display status mode information on the bottom display unit. Status information includes dedicated system information such as control surface positioning and a single page of status messages. The STATUS switch is also used to page through additional status messages, if necessary. Pressing the STATUS switch will cycle through the status message list. Once all messages have been displayed, pressing the STATUS switch again will clear the status format. In the event of a display unit failure, the STATUS switch is inhibited when the airplane is in the air.

 (3)  
The EVENT RECORD button is used to store the instantaneous values of system parameters in non-volatile memory. This is known as a Manual Event recording. Pressing EVENT RECORD will record a Manual Event for the ECS, ELEC/HYD, and PERF/APU formats.

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MAINTENANCE MANUAL

 (4)  
The COMPUTER select switch provides automatic or manual switching of the EICAS computers. When the select switch is in L or R position, the left or right computer, respectively, will drive the EICAS display units. When the select switch is in the AUTO position, the left computer will normally drive the EICAS displays. If the left computer fails, the system automatically switches to the right computer.

 (5)  
The BRT controls consist of two concentric rotary knobs. When rotated clockwise, the inner knob increases the brightness of the top display unit, and the outer knob increases the brightness of the bottom display unit. The knobs are mechanically clutched together so that under normal operation they rotate together.

 (6)  
The THRUST REF SET controls are used to manually set the thrust reference readout. They also set the reference cursor on the left and right primary thrust indicators.

 (a)  
The engine selector switch (outer control knob) is a three position rotary switch. This switch is used to select the L (left), BOTH, or R (right) primary thrust indicator references.

 (b)  
The inner control knob is a 12-detent rotary switch combined with a two-way push-pull switch. When initially set (pulled out), the reference readout (and cursor) are set to 1.55 EPR on the selected EPR indicator(s). Rotating the knob clockwise will increase the reference readout (and cursor) by 0.01 EPR per detent.

 (c)  
EPR reference values can be set between 0.965 and 2.05 EPR.

 (7)  
The MAX IND RESET button is a momentary switch that clears maximum engine exceedance readouts from the display. Pressing this button will clear only engine exceedance data for which the exceedance no longer exists.

 E. Cancel/Recall Switches
 (1)  The CANCEL and RECALL switches are momentary pushbutton switches located on the pilots center instrument panel (P1). Pressing CANCEL will remove the caution (level B) and advisory (level C) messages that are currently displayed. The next page of B and C messages will then be displayed. Pressing RECALL will return the first page of B and C messages to the display. Level A messages are unaffected by these switches.
　
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本文鏈接地址：757 AMM 飛機維護手冊 儀表 CHAPTER 31 - INSTRUMENTS 2(14)