• Home
  • Download PDF
  • Order CD-ROM
  • Order in Print
Figure 5-3.-A279 copilot HSI control
HEADS-UP DISPLAY (HUD)

Aviation Electronics Technician 1 (Organizational)
Page Navigation
  94    95    96    97    98  99  100    101    102    103    104  
1. The HEADING NO-GO indicator illuminates when there is a failure with the heading function in the central repeater system (CRS). 2. The ATTD BEARING NO-GO indicator illuminates when there is a failure with the attitude bearing function in the central repeater system. 3. The DIST NO-GO indicator is not used in the P3-C. 4. The COURSE selector switch selects the course data for display on the HSI. The course data is either set by the computer (COMP) or by the pilot’s control box (REP PILOT). 5. The HDG switch selects either magnetic (MAG) or true (TRUE) heading signal inputs to be displayed on the NAV/COMM HSI. 6. The HDG/ATTD switch selects either INS-1 or INS-2 to be the source for the heading data signal to be displayed. 7. The BRG 2 selector switch selects the source for the information to be displayed on the NAV/COMM HSI bearing pointer 2. The sources available for selection are VOR-2, VOR-1, TACAN, ADF, DF, or DA. In the DA position, drift angle supplied by the Doppler radar or the central computer is displayed. System Description The HSI system functions as a selectable display for the navigational systems on the aircraft. When the TACAN, VOR-1, or VOR-2 system is selected, the corresponding system will provide radial bearing and bearing information, NAV flag, course deviation, and To-From signals to the HSI. The bearing signal will position the bearing pointer 1 or bearing pointer 2, as selected. The radial bearing information is resolved with the course set by the COURSE SET knob. The resultant signal is returned to the TACAN, VOR-1, or VOR-2 to be used to develop the course deviation and To-From signals. These signals are returned to the HSI, where the course deviation signal displaces the course deviation bar. The To-From signal will drive the To-From arrow in the proper direction. If the flag input signal becomes unreliable during a radio navigation mode, the NAV flag appears on the HSI. When TACAN is selected, the distance signal from the TACAN will position the dials of the distance counters to reflect the distance to or from the TACAN station. The UHF-DF/OTPI and the ADF systems will supply bearing information when selected. This information is routed to either the bearing pointer 1 or bearing pointer 2, as selected. Magnetic and true heading information is supplied to the HSI compass card by the INS-1 and INS-2, as selected. Magnetic heading is normally used to position the compass card. When a tactical mode is selected, magnetic heading information is switched out of the circuit, and the compass card will be driven by the true heading information. BEARING-DISTANCE-HEADING INDICATOR The bearing-distance-heading indicator (BDHI) (fig. 5-5) may be used with the various navigational systems, and it provides information according to the mode selected. Some aircraft may have more than one BDHI, with separate select switches for each instrument. The distance counter numerals may be in a vertical row or horizontal, as shown in figure 5-5. Indicator Parts This section will explain the various parts of the BDHI. Refer to figure 5-5 while reading the following text. The lubber index is a fixed reference mark that allows the operator to read the heading from the Figure 5-5.-Bearing-distance-heading indicator. 5-4







Western Governors University

Privacy Statement
Press Release
Contact

© Copyright Integrated Publishing, Inc.. All Rights Reserved. Design by Strategico.