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 11. HSI Transfer Switches_____________________
 A.  The HSI transfer switches with VOR/ILS--NAV positions are installed on the pilots' lightshield panel. The captain's HSI transfer switch controls VOR/ILS - NAV transfer relay No. 1 while the first officer's HSI transfer switch controls VOR/ILS - NAV transfer relay No. 2. The switches enable the captain and first officer to select either the VOR/ILS navigation system or the FMCS for driving the HSI navigation displays.
 12. VOR/ILS - NAV Transfer Relays_____________________________
 A.  Two stepping-type VOR/ILS - NAV transfer relays are installed in rack E3-4. The relays, controlled by the HSI transfer switches, select either the VOR/ILS navigation system or the FMCS for driving the HSI navigation displays.
 13. Flight Instrument Accessory Unit________________________________
 A.  A flight instrument accessory unit is located in electronic equipment rack E-1. The unit contains relays and printed circuit for signal conditioning and interface between the navigation systems and the flight instruments. In addition, the unit contains numerous relays, time delay gates, a circuit interrupter and other components used for interconnecting the DFCS system.
 B.  The flight instrument accessory unit circuits associated with the VOR/ILS navigation system consist of the diodes across the coils of the transfer relays; the VOR/ILS navigation unit deviation and flag warning output loading resistors; four relays for inhibiting the VOR/ILS self-tests when the autopilot is operating in an approach mode and the ground return for energizing ILS relays No. 1 and No. 2; and two DME agility mode relays for inhibiting the RDDMI VOR bearing displays.
 14. DFCS Mode Control Panel_______________________
 A.  The DFCS mode control panel (MCP) is mounted on the glare sheild, accessible to both pilots. The front panel is edgelighted and interconnection to airplane wiring is made by three connectors located on the rear panel. The MCP consists of control switches, indicators, electronic circuits, and status and mode displays generated by the flight control computer. The panel provides control of airplane heading, course, altitude, and speed. Additional description, operation and maintenance instructions for the MCP are provided in 22-11-00, DFCS.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 B.  The controls and indicators associated with the VOR/ILS navigation system are the captain's and first officer's COURSE select knobs and indicators. The left course knob interfaces with the captain's systems while the right course knob interfaces with the first officer's systems. Each COURSE knob provides 360 degrees of course setting per knob revolution in 1-degree steps. The COURSE indicators are driven directly by the associated COURSE knob.
 15. Digital/Analog Adapter Units
____________________________
 A.  The digital/analog adapter (DAA) units are located on electronic equipment rack E1-2. Each DAA is a 1/2 ATR long unit with rack mounting provisions. Electrical connections are provided by a connector on the rear of the unit which mates with a rack-mounted connector.
 B.  The DAA units provide signal conversion from analog to digital and digital to analog to interface the IRS, FMCS, DFCS, DME, flight recorder, fuel summation, N1 indicating, VOR/ILS and weather radar systems and the flight instrument displays.
 C.  The DAA conversions associated with the VOR/ILS navigation system consist of the following:
 (1)  
Converts, during manual tuning mode, VOR/ILS and DME 2 by 5 analog tuning data to digital for transmission to the FMCS. The DAA distinguishes between VOR and ILS frequency by the localizer tuned (ILS 28V dc) discrete input.

 (2)  
Converts VOR/LOC deviation and bearing analog signals to digital for transmission to the FMCS when the VOR/LOC valid (VOR/LOC super flag) discrete is present.

 (3)  
Converts digital tuning data from the FMCS to analog 2 by 5 tuning data for tuning the DME and VOR/ILS navigation units when the autotune mode discrete from the VHF NAV control panel is present. With the autotune discrete absent, the DAA reverts to the manual tuning mode.

 D.  For additional description, operation and maintenance instructions applicable to the DAA units:
 -
AMM 34-28-00, IRS

 -
AMM 34-55-00, DME
　
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