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% % % % % % % % % Figure 6: Mid Continent MD 41 GPS Annunciation Control Unit % % %
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% % Figure 7: Block Diagram %
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% E. MD 41 GPS Annunciation Control Unit % Figure 6 shows the Mid Continent MD 41 GPS annunciation control unit. It is installed in the left-% hand section of the instrument panel, see Chapter 31. % The MD 41 is a self-contained GPS annunciation and control unit. Figure 4 shows how the MD 41 % works. The information from either the NAV 1 (VOR) receiver or the GPS receiver can be switched % to the data inputs of the HSI (refer to Section 34-28). In addition, this navigation information is also % used for the KAP 140 autopilot, if the autopilot is installed (refer to Chapter 22). % An ILS override feature automatically switches to the NAV mode when the NAV 1 receiver is tuned % to an ILS frequency. % The MD 41 contains several GPS status annunciations used to indicate modes selected by the % front panel switches and various inputs from the GPS receiver. % Any time power is removed or turned off, or in the event off a power failure of the MD 41, the % MD 41 turns automatically to the 'Emergency Mode'. In this mode the HSI (see Section 34-28) is % connected directly to NAV 1.
% The GPS annunciation control unit has the following annunciations:
%) NAV. It indicates that NAV 1 (VOR) information is being presented on the HSI.
%) GPS. It indicates that GPS information is being presented on the HSI.
%) ARM. It indicates that the GPS is armed for automatic transition to approach mode.
%) ACTV. It indicates that the GPS is actively engaged in the approach mode.
%) MSG. It indicates that there is a GPS message alert from the GPS receiver.
%) WPT. It indicates that there is a GPS waypoint alert from the GPS receiver.
% The GPS annunciation control unit has these controls:
%) NAV/GPS button. It switches between NAV 1 (VOR) or GPS presentation on the HSI.
%) GPS/APR button. It arms the GPS Approach Mode.
%) LAMP TEST button. It is used for testing the annunciation lamps.
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% % Figure 8: Mid Continent MD 41-1488/1484 GPS Annunciation Unit %
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% F. MD 41-1488/1484 GPS Annunciation Unit % Figure 8 shows the Mid Continent MD 41-1488/1484 GPS annunciation unit. The MD 41-1488 % operates on 28 volts, the MD 41-1484 operates on 14 volts. The GPS annunciation unit is installed % in the left-hand section of the instrument panel, see Chapter 31. % The MD 41-1488/1484 is a self-contained GPS annunciation unit. It displays status annunciation % received from the Garmin GNS 430/530 GPS receiver.
% The GPS annunciation unit has the following annunciations:
%) VLOC. NAV or ILS information presented on the HSI.
%) GPS. GPS information presented on the HSI.
%) MSG. ON indicates message(s) active.
%) WPT. ON indicates reaching the arrival waypoint.
%) TERM. ON indicates airplane is within 30 miles of departure or arrival airport.
%) APR. ON indicates the approach is active.
% The GPS annunciation unit has these controls:
%) TEST button. It is used for testing the annunciation lamps.
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