HSI WEATHER RADAR INDICATIONS

HSI weather radar indications

ADI ANNUCIATIONS PFD

The ADI (altitude direction indicator) annunciates a few icons on the display which are clearly marked in the figure and description is given below.

1. Radar Altitude Indication,

2. Minimum Selected Readout,

3. Marker Beacon Annunciation,

4. Minimum Annunciation,

5. Graphic Monitor Annunciation,

6. Attitude Source Annunciation,

7. Air Data Source Annunciation.

ADI INDICATIONS AND ADI ANNUNCIATIONS

ADI (Attitude direction indicator) primary function is to display the aircraft’s current attitude. It combines the functions of many electro mechanical indicators into a single electronic display. The ADI indications are marked and explained below. The ADI indication is present on top of the Primary flight display.

1. Flight Path Reference line,

2. Airplane Symbol,

3. Flight Path Vector Speed Error Line,

4. FPA Acceleration Pointer,

5. Pitch Limit Indicator,

6. SLIP/SKID Indicator,

7. Roll SCLAE/LOW Bank Limit Arc,

8. Roll Pointer,

9. Flight Path,

10. Flight Director,

11. ILS Glide Slope Deviation,

12. FMS Vertical Deviation,

13. ILS/VOR Lateral Deviation,

14. FMS Lateral Deviation,

15. Pitch Angle Scale.

ALTITUDE INDICATIONS

The altitude is displayed in tape format on the PFD. The altitude tape also displays the Flight Guidance Controller preselected altitude (ASEL), respective preselected altitude bug, and altitude trending vector.

1. Altitude Tape,

2. Metric Altitude Readout,

3. Altitude Rolling Digit Readout,

4. Barometric Correction,

5. Altitude Trend Vector,

6. Selected Altitude Bug,

7. Selected Altitude Readout,

8. Metric Selected Altitude Readout.

VERTICAL SPEED INDICATIONS

The Vertical Speed Indicator, abbreviated as the VSI, presents the pilot with information on how fast the aircraft climbs or descents. This is achieved by measuring how fast the ambient pressure changes and translating this as a rate of change in feet per minute. In the below figure VSI indications are given in detail. The vertical speed is displayed in analogical and digital formats on the PFD. Besides presenting the current vertical speed, the Vertical Speed Indicator (VSI) also displays target vertical speed and respective bug, set through the Flight Guidance Controller. The PFD VSI also indicates vertical direction and minimum vertical speed to be attended during evasive maneuvers, according to TCAS commands.  

1. Selected Vertical Speed Direction Arrow,

2. Selected Vertical Speed Read Out,

3. Vertical Speed Scale,

4. Selected Vertical Speed Bug,

5. Vertical Speed Counter,

6. Vertical Speed Readout.

AIRSPEED TAPE INDICATIONS

The below are the detailed description of air speed parameters. All the parts of the air speed indication are listed below with the following parameters. The airspeed tape indications are present on the top left side corner of the primary function display.

1. Selected Airspeed/Mach Read Out,

2. Selected Air Speed Bug,

3. VFS Speed,

4. V2 Speed,

5. Air Speed Trend Sector,

6. VAC (Vertical alternating current) Speed (AC),

7. VR (rotation) Speed,

8. VAP (value added processor) Speed (AP),

9. VREF (approach reference) Speed (RF),

10. Ideal Flap Selection Speed (DOT),

11 V1 Speed,

12. Ground Speed,

13. Mach Air Speed Read Out,

14. Low Speed Awareness Tape,

15. Air Speed Rolling Digits,

16. VMO/MMO Barber Pole,

AIRSPEED TAPE INDICATIONS 

17. Speed Digit Read Out.

TAKEOFF MODE ON PFD

 The takeoff mode is a FD only mode and is represented by crossbars on PFD .TO mode commands the airplane to maintain a pitch attitude reference. In take off the autopilot engagement   is not   accepted and FPA mode is inhibited. Lateral mode changes are allowed.

FPA (flight path angle) indication is inhibited for 30 seconds after liftoff when takeoff using raw-data information.

Take Off Mode on PFD

Pressing the TO/GA (Take off or Go Around) button activates the TO mode. Following a landing, the TO mode can be enabled after 5 seconds on ground.

AFCS INDICATIONS ON PFD

The FMA (Flight Mode Enunciator) is displayed on the top of PFD. The FMA displays indications of auto throttle, autopilot, active AFCS channel, lateral mode and vertical mode.

The FMA Colour code for normal operation is the following:-

Magenta: FMS commands active/engaged mode.

 Green      : Non-FMS commanded active/engaged mode

 White     : armed mode

 Amber    : Alert condition

 Red         : Abnormal condition

AFCS INDICATIONS ON PFD

pfd GENERIC

PFD PRIMARY FLIGHT DISPLAY GENERIC DESCRIPTION

The PFD display system can be categorized by two parts namely upper part and lower part. In the upper part the AVIATE information is present like Autopilot Approach status Enunciator, Flight mode Enunciator, Attitude and Side Slip, Altitude, Airspeed Mach, Vertical speed, Flight Path angle, Total Energy, Flight Director, TCAS RA, Wind shear, Radio Altimeter. 

pfd PRIMARY FLIGHT DISPLAY

PFD displays information such as airspeed indicator, altitude indicator, ADI, HIS, vertical speed indicator, radio aids, autopilot, flight director, and radio altitude data. They are displayed in two sections.

In the event of display failure, information may be presented in the MFD by appropriately setting the reversionary panel.In case of miss matched information between two PFDs, no information at will be presented.

PFD OF AIRBUS 320 A 320

The display controller portion of the guidance panel allows the section of PFD HSI formats, navigation sources, weather display and bearing pointer selection.