Package aero.t2s.modes.decoder.df.bds

Class Bds40

java.lang.Object
aero.t2s.modes.decoder.df.bds.Bds
aero.t2s.modes.decoder.df.bds.Bds40
public class Bds40
extends Bds
56-bit MB Field is structured in the following format 

 LSB |1-------|2----------|14------|15---------|27------|28---------|40--------|48------|49----|50---|51---|52--------|54------|55------|
     | STATUS |  MCP ALT  | STATUS |  FMS ALT  | STATUS |    BARO   | RESERVED | STATUS | VNAV | ALT | APP | RESERVED | STATUS | SOURCE |
 MSB |-------1|---------13|------14|---------26|------27|---------39|--------47|------48|----49|---50|---51|--------53|------54|------56|
Status flags
  • MCP/FCU Status - (bit 1) indicates if MCP/FCU Selected altitude is available
  • FMS Status - (bit 14) indicates if FMS Selected altitude is available
  • Baro Status - (bit 27) indicates if barometric pressure setting is valid
  • MCP/FCU Mode Status - (bit 48) indicates if MCP/FCU mode bits are available
  • Target source altitude - (bit 54) indicates if the selected altitude source is available. This is not the same as the information stored in bit 1 see information below on MCP/FCU Altitude

MCP/FCU Selected altitude

This information which represents the real “aircraft intent,” when available, represented by the altitude control panel selected altitude, the flight management system selected altitude, or the current aircraft altitude according to the aircraft’s mode of flight (the intent may not be available at all when the pilot is flying the aircraft).

Source is determined using Target Altitude Source (bit 55-56) and is only available if status bit (bit 54) is set to 1. See SelectedAltitudeSource for more details

Note: LSB (1 bit) = 16feet with a range 0 - 65520 feet, this class considers altitudes above 50000ft as invalid / error.

FMS Selected altitude

This field when available indicates the FMS selected altitude. This field could differ when selects a different altitude on the MCP/FCU panel

Example: FMS has VNAV altitude set at 32000ft, the aircraft is at 26000ft and instructed to climb to 30000ft. At this moment the pilot selects 30000ft on the MCP/FCU which is transmitted in the MCP/FCU field. The FMS selected altitude field is transmitting 32000ft, the Target Altitude Source flag is set to MCP.

Note: LSB (1 bit) = 16feet with a range 0 - 65520 feet, this class considers altitudes above 50000ft as invalid / error.

Barometric Pressure Setting

When status flag (bit 27) is set to false indicates the information is valid and van be used

Note: LSB (1 bit) = 0.1mb with a range 0 - 410mb. You need to add 800mb to receive the real baro steting

MCP/FCU Mode bits

Only available if Status (bit 48) is set.

  • VNAV Mode (bit 49) - Indicates if VNAV navigation is engaged
  • ALT Hold Mode (bit 50) - Indicates if altitude hold is enabled
  • APP Mode (bit 51) - Indicates if Apprach mode is selected

  • Constructor Details

    • Bds40

      public Bds40​(short[] data)

  • Method Details

    • apply

      public void apply​(Track track)
      Specified by:
      apply in class Bds

    • reset

      protected void reset()
      Specified by:
      reset in class Bds

    • isStatusMcp

      public boolean isStatusMcp()

    • isStatusFms

      public boolean isStatusFms()

    • isStatusBaro

      public boolean isStatusBaro()

    • isStatusMcpMode

      public boolean isStatusMcpMode()

    • isStatusTargetSource

      public boolean isStatusTargetSource()

    • getSelectedAltitudeSource

      public SelectedAltitudeSource getSelectedAltitudeSource()

    • getSelectedAltitude

      public int getSelectedAltitude()

    • getFmsAltitude

      public int getFmsAltitude()

    • getBaro

      public double getBaro()

    • isAutopilotVnav

      public boolean isAutopilotVnav()

    • isAutopilotAltitudeHold

      public boolean isAutopilotAltitudeHold()

    • isAutopilotApproach

      public boolean isAutopilotApproach()