• Uses limited panel space
• Familiar RMI and HSI presentations allow for quick interpretation of displayed data
• Full navigational information that is available for standby use in the event of another system failure
• High-resolution, high contrast display for easy pilot viewing in all lighting conditions
• Low-power consumption, ideal for standby requirements in emergency situations
• All ARINC 429 interface capability for high reliability data transmission and wire-saving installation
• Single or dual tube configuration
• Concentrates radio sensor information for compatibility with the RTU-870( ), RTU-4000 and RTU-4200 units
• Compatible with GAMA 429 and ARINC 702 flight management systems
• Compatible with the Pro Line II 400 Series radios via ARINC 429 data buses

The MND-640B Multinavigation Display is an all-digital Radio Magnetic Indicator (RMI) that offers the additional capability of displaying other navigational information for standby use. Designed for installation in the all-digital jet or turboprop aircraft, it features low-power consumption, small panel space requirements and the ability to clearly display a multitude of navigational data.

The MND-640B system consists of one or two SDU-640B Sensor Display Units and an SDD-640A Sensor Display Driver. The SDU-640B is a fully integrated display that contains a three-inch, high-resolution, monochromatic CRT assembly and a symbol generator in one box. The SDD-640A is a remotely mounted data concentrator that collects navigational sensor information, combines this information onto a digital data bus and transmits it to the SDU-640B for display.

The SDD-640A accepts navigational data from various navigational sources. All inputs and outputs are via ARINC 429 data buses. Functionally, the SDD-640A receives and processes two completely independent channels of data, one from the aircraft's right side navigation sensors and the other from the aircraft's left side navigational sensors.

The SDD-640A also has the capability of concentrating radio sensor information for use by the RTU-870( ) Radio Tuning Unit when it is installed in the aircraft.

The SDU-640B takes the navigational data and generates a variety of display formats. The formats and their descriptions are listed in the specifications. The SDU-640B strokewrites the formats to give excellent sunlight readability.

The operating controls of the system are straightforward with rotary knobs allowing selection of:

• Navigation source for single bar bearing pointer
• Navigation source for double bar bearing pointer
• Selected heading and selected course when in HSI mode
• Display format of center area
• Brightness trim control

The source of information supplied to the bearing pointer can be VHF Omnidirectional Radio Range (VOR), automatic direction finder, Flight Management System (FMS) and TACAN (TCN) with the source being annunciated next to the controlling knob. Pointer Off is also selectable.

Four types of data can be displayed in the center area of the compass rose: Distance Measuring Equipment (DME), approach deviation, VOR/FMS/TCN deviation and FMS/VLF Very Low Frequency present position. The format selection knob permits the pilot to select data from VOR/ILS Instrument Landing System, DME, FMS, VLF, microwave landing system and TCN sources. The type of format selected is annunciated in the upper left corner of the display.

A summary of MND-640 system interfaces is listed below by associated equipment and by signal format