Control Display Subsystem

Introduction

The Control Display Subsystem (CDS) is the primary interface for both Pilot and Copilot to display and control flight and navigation data, communications, sensors and weapons. The CDS is comprised of two Improved Master Controller Processor Units (IMCPUs), two Multifunction Displays (MFDs), one Multifunction Keyboard (MFK), one Remote Frequency Display (RFD), two Optical Display Assemblies (ODAs) and one Personal Computer Data Transfer System (PC-DTS). Other systems linked to the CDS include the Mast Mounted Sensor (MMS), AN/APR-39 Radar Detector Set, AN/AVR-2 Laser Detection Set, AN/ALQ-144 Infra-red Countermeasures Device and the AN/AAR-57 Common Missile Warning System.

Improved Master Controller Processor Unit

The Left and Right Improved Master Controller Processor Units handle all inputs to the CDS and processes and displays data to the various output interfaces.

Multifunction Display

Two Multifunction Displays housed in the instrument display function as the main output device for the CDS. The MFDs operate independently allowing different functions to be performed simultaneously by the Pilot and Copilot.

Each MFD includes fifteen bezel buttons for mode and function selection, a Brightness (BRT) and Contrast (CNT) rocker for adjusting the display picture.

A Manual/NVG Mode selector allows for changing the display image between a daylight setting and an NVG compatible mode.

The Primary/Backup selector allows for selection of the alternate IMCPU as the input source in the event that the primary source fails.

Multifunction Keyboard

The Multifunction Keyboard (MFK) is located on the center console and is available to both crewmembers. Data entry on the MFK is shared between both MFDs and so only a single entry mode may be active at any time.

1. Numeric keys. Used to enter numerals. A decimal point and minus key are also included
2. Alpha keys. Used to enter characters
3. Labelled keys
   • IFF. Displays IFF page 1 on the Copilot MFD
   • TUNE. No function
   • SCAN. No function
   • BLANK. Inserts a blank space
   • IDNT. Broadcasts IFF identification
4. ENTER key. Confirms entry of input data. Exact function depends on data entry mode
5. CLEAR key. Clears all input
6. CURSOR LEFT/RIGHT keys. Advances/Retreats the cursor. Left key will delete any preceding input. Right key will add a space if at end of input

Optical Display Assembly

The Optical Display Assembly (ODA), also referenced as the ANVIS Display Symbology Subsystem (ADSS) is a helmet mounted display system that is attached to the Night Vision Goggles and provides primary flight data similar to the VSD and Sparse VSD displays.

The Pilot and Copilot have independent ODAs that can be configured from the Initial 2 page on their respective MFDs. The display mode and data are determined by the respective MFD page and weapon selections.

ODA Symbology

The ODA shares many symbology components with the VSD and Sparse Weapons pages on the MFDs. The symbology displayed varies depending on the selected weapon and weapon modes. The ODA also provides declutter options.

ODA Declutter Levels

The ODA Declutter Levels can be selected from the MFD Initial 2 page.

When Level 1 is selected, the Vertical Speed Indicator and Analog Radar Altitude display are hidden.

In Declutter Level 2, the Vertical Speed Indicator, Analog Radar Altitude Display, Indicated Airspeed, Barometric and Radar Altitude displays, Engine and Mast Torque indicators, Weapon Armament Indicator and all weapon symbologies are hidden.

ODA Symbology – Gun

When the Gun is selected from the Pilot’s Weapon Selector switch, the symbology includes the following displays:

1. MMS Line of Sight (LOS) Indicator 2. Gun Reference Cue

ODA Symbology - Rockets

1. Rocket Cue

ODA Symbology - Hellfire

1. MMS Line of Sight (LOS) Indicator
2. Hellfire Constraints Indicator (LOBL)

ODA Symbology - ATAS

1. MMS Line of Sight (LOS) Indicator
2. ATAS Seeker Cue

1. Super elevation Bar

Pilot Display Unit

The Pilot Display Unit (PDU) is mounted to the helicopter airframe above the pilot’s windshield.

The PDU can be adjusted vertically for differing pilot eye levels. The PDU control panel has a BRT knob which allows pilot to adjust display brightness and a TEST button which initiates the built-in test (BIT) of the PDU and Electronics Unit (EU).

The PDU provides symbology and weapon system status for ATAS and symbology only for 2.75-inch rocket and .50 caliber machine gun weapon systems.

1. Gun crosshair
2. Master Arm status

1. Projected rocket impact area / beaten zone
2. Master Arm status

1. ATAS 20-degree Field of View outline
2. ATAS Tracking Reticule
3. Missile Selected (closed icon at bottom left)
4. Missile Present (open icons)