a) The vertical deviation pointer indicates the deviation from the desired descent. The vertical deviation pointer is read relative to the vertical deviation scale. In addition if the vertical deviation is 440 feet or greater, then a numerical value of the deviation will be displayed.
6) Distance a) Distance (miles-to-go) to next waypoint is displayed in the upper left corner of the EHSI. 7) ETA a) The ETA (estimated-time-arrival) to next waypoint is displayed in the upper right corner of the EHSI.
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737-300/400/500MAINTENANCE MANUAL
8) Wind Direction and Speed
a) The FMC wind data is displayed on the EHSI in the lower left corner of the display. The wind direction is displayed by a pointer along with a numerical readout. The pointer will rotate as a function of wind direction to depict wind angle with respect to the current airplane track angle. A numerical readout of wind speed will be displayed next to the wind direction numerical readout.
9) Annunciation
a) When the FMC signals that the airplane is within a predetermined time to a leg change, the ALERT annunciation comes on.
b) The EFSG annunciates the source of navigation data. The annunciation is in the lower left corner of the EHSI.
(3) Map and Center Map Modes
(a)
The FMC detects if Map or Center Map is selected on the EFIS control panel. The FMC also detects the map range and the display options that are selected on the control panel. The FMC processes the map data and transmits the data to the EFSG.
(b)
The map modes are used during flight to monitor airplanes position along the selected flight path.
(c)
The FMC transmits dynamic and background data for the active flight plan. This data is transmitted to the EFSG for display on the EHSI. 1) Dynamic data is defined as symbology which moves relative
to the background data. This symbology consists of: Waypoints, Nav Aids, Airports, Holding Patterns, Procedural Turns, Curved Trend Vectors, Range to Altitude Line, and Vertical Deviation Pointer.
2) Background data consists of: Distance-To-Go and estimated time of arrival (ETA) to the next waypoint, Waypoint Identifiers, Track Angle, and Wind Direction and Speed. The inactive and offset flight plans also provide background data.
(d) In addition to providing dynamic data for the active flight plan, the FMC can provide optional dynamic data. The optional dynamic data is displayed on the EHSI, when one or more of the following MAP switch indicators are selected on the EFIS control panel: 1) NAV AIDS - When nav aids is selected, the FMC transmits
data on all nav aids in the selected range, except those nav aids which are transmitted with the active flight plan.
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737-300/400/500MAINTENANCE MANUAL
2) ARPT - When ARPT is selected, the FMC transmits data on all airports in the selected range, except those airports which are transmitted with the active flight plan.
3) RTE DATA - When RTE DATA is selected, the FMC transmits data for estimated time of arrival and altitude for all waypoints on the active flight plan.
4) WPT - When WPT is selected, the FMC transmits data for navigation reference points or positions (other than nav aids) which are not on the active flight plan.
7. Fuel Summation Unit (Fig. 12)___________________
A. The fuel summation unit integrates the serial digital data fuel quantity tank indicator inputs and develops total fuel analog output.
B. The tank quantity indicators provide serial digital data representing fuel quantity to the demodulator-latch circuits into the summation unit. The demodulator-latch circuits removes the serial digital data from the line.
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