Fuel system indicators5/1/2023 These segments remain off until the received signal level indicates a reading at or within the red or amber range. When the first segment above the red or amber range goes on, all red- or amber-coded segments go off. When scales with red-and amber-coded segments below green-coded receive a signal level of zero (bottom scale), the segments light in normal progression and remain on. They go off in normal progression as the received signal level decreases. They remain on as the received signal level increases. The scales operate as segments and light in normal progression. These readings are shown by ascending and descending columns of multicolored lights (red yellow, and green) measured against vertical scales. The VIDS ( Figure 9-1) consists of a vertical strip central display unit (CDU), two vertical strip pilot display units (PDU), and two signal data converters (SDC). VERTICAL INSTRUMENT DISPLAY SYSTEM (VIDS) This chapter will discuss the most commonly used instruments and the newer vertical scale (VIDS). The pilots have the ability to quickly glance at the instrument for a reading. The vertical scale offers similar safety conditions. In this way, pilots do not have to divert their eyes from the view in front of and around them. The HUD system projects instrument images on the windshield in front of the pilots. Instruments today read in vertical scales, digital readouts, and in some cases heads up display (HUD). Refer to the engine's maintenance manual for maintenance, operational limitations, and color code markings. They aid the pilot in monitoring the engine, rotor, or propeller RPM pressures temperatures and general engine performance. Engine instruments are mounted on the instrument panel in the pilot's compartment.
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