TAWS | Terrain Awareness and Warning System

 
  • Overview
  • Specifications
  • Additional Images

Offering the Highest Protection Against CFIT Accidents

Aircraft inputs such as position, altitude, air speed, glideslope and flight plan along with internal terrain and airport databases allow TAWS to predict a potential conflict between the aircraft’s future flight path and terrain. The resulting unprecedented look-ahead capability provides warnings and alerts well in advance of potential hazards, allowing time for the pilot to make the necessary maneuvers or data corrections for terrain avoidance.

TAWS: Class A & B

Two classes of TAWS are o ered to meet your aircraft and regulatory requirements, TAWS Class A and TAWS Class B. Providing the highest level of protection against Controlled Flight Into Terrain (CFIT) accidents, TAWS Class A provides all the functionality of the Class B system, plus a terrain awareness display to the aircraft’s display system and a “fully autonomous” Ground Proximity Warning System (GPWS).

Universal Avionics’ TAWS Class A system will also support smart bank angle alerts, minimum callouts and altitude callouts at selected altitudes. It also provides the class-specific, required RTCA DO-161A and TSO-C92c GPWS, warning of imminent contact with the ground.

Approved in accordance with TSO-C151b requirements, Universal’s TAWS Class A and Class B systems both offer:

  • Forward Looking Terrain Avoidance (FLTA) based on terrain data and the aircraft’s state and predicted flight path
  • Premature Descent Alerts
  • Attention alerts (aural “Five Hundred” callout and alerts based on temperaturecompensated GPS altitudes)
  • Indications of imminent contact with the ground.

Crisp, Clear Graphics

Universal Avionics’ TAWS integrates with the FMS to provide an additional unique predictive alerting feature, based on information in the flight plan.

TAWS provides an exceptionally crisp and clear graphical depiction of actual terrain, in three view formats (Map View, 3-D Perspective View and Profile View), on the FMS CDUs or flight deck displays such as the MFD-640 or EFI-890R/ MFD-890R.

Terrain Data

The high-resolution terrain database is stored in internal  ash memory and updated using the Data Transfer Unit via a high-speed Ethernet bus. It features a data point approximately every 0.5 mile world-wide and up to 0.1 mile at mountainous airports. The terrain database also includes data for depict ing oceans and large inland bodies of water.

Obstacle Data

Depiction and alerting of man-made obstacles is available in the Class A and Class B systems as an optional con guration in the TAWS software. The Obstacle Database, required for depiction of man-made obstacles, contains the latest obstacle features. Use of obstacle alerting requires the installation of an external annunciator on the flight deck.

Obstacle data is compiled by Jeppesen Sanderson, Inc. and is captured from digital and paper (graphic and tabular) sources provided by governmental civil aviation authorities and military agencies worldwide.

TAWS Obstacle Clearance
Color-coding is utilized to depict terrain relative to the aircraft’s altitude. Red shows terrain above. The yellow band is  ight phase dependent re ecting terrain down to 1,000 feet below during enroute, 500 feet in terminal areas, and 250 feet on approach.

The Obstacle Database is intended for situational awareness and reference use only. It is not intended for actual aircraft navigation and does not include all obstacles in the world. The Obstacle Data contained in the Obstacle Database is compiled by Jeppesen Sanderson, Inc. and is based on information obtained from government and other publicly available sources for use in Universal Avionics’ TAWS systems. The TAWS systems with the Obstacle Database is not intended to provide navigational guidance, except for warnings to avoid hazardous terrain and/or obstacles, nor to relieve aircrews from following published navigation procedures, routes, altitude restrictions, and/or instructions from appropriate air traffic control agencies.

TAWS Diagram

Hardware

Size: Unit Size: 2.25 in. W x 7.64 in. H x 15.18 in. D
Weight: 9.6 lbs
Mounting: 2 MCU Rack
Cooling: Passive cooling fan
Power: 28VDC @ 1.0 Amp nominal
Environmental categories: DO-160D
Minimum Performance Standards: DO-161A Airborne Ground Proximity Warning Equipment
Software Certi cation: DO-178B Level C
Criticality level: Major
Terrain Database: DO-200A compliant
TSO: C151b Terrain Awareness and Warning System, C92c Airborne Ground Proximity Warning Equipment

Display Interfaces

Additional interfaces under development.
Contact your Universal Avionics representative.

Universal Avionics

EFI-890R/MFD-890R
MFD-640
FMS with 4-inch or 5-inch CDU

Honeywell

Primus 1000
EFIS-805 (specific versions via WXPD/SCI)
EFIS-10 (ARINC 708)
Primus 880/660/440 series
Primus 800/870/650 (WXPD/SCI)
RDR 4A/B

Rockwell Collins

FDS-2000
PL-4000 EFIS
PL-21 EFIS
EFIS 85/86 (via WXP-850 or WXA-1000)
WXR-850
WXR-70X

System Architecture

TAWS Architecture
  • Profile View
    Profile View
  • Map View
    Map View
  • 3-D View
    3-D View
  • A map view of terrain can be output using ARINC 708
    or WXPD formats.
    A map view of terrain can be output using ARINC 708 or WXPD formats.
  • 3-D View - A close distance obstacle that extends
    above the aircraft altitude.
    3-D View - A close distance obstacle that extends above the aircraft altitude.
  • 3D View - Obstacles displayed in different colors
    according to their relative altitudes to the aircraft.
    3D View - Obstacles displayed in different colors according to their relative altitudes to the aircraft.
  • Map View (5 NM range) - Obstacles displayed in different
    colors according to their relative altitudes to the aircraft.
    Map View (5 NM range) - Obstacles displayed in different colors according to their relative altitudes to the aircraft.
  • Map View (20 NM range) - Obstacles displayed in
    different colors according to their relative altitudes
    to the aircraft.
    Map View (20 NM range) - Obstacles displayed in different colors according to their relative altitudes to the aircraft.
  • Profile View (5 NM range) - Obstacle caution alert.
    Profile View (5 NM range) - Obstacle caution alert.
  • Profile View (10 NM range) - Obstacle caution alert.
    Profile View (10 NM range) - Obstacle caution alert.