Enhanced situational awareness during TAWS alerts to prevent unnecessary go-arounds
Publication Date: 2015-Feb-09
The IP.com Prior Art Database
This innovation idea would provide information to the crew that is not currently available to them (climb angle, speed and time to impact). It would also provide a graphical RTC by showing the crew how high they need to fly the A/C to be within a safe margin. The innovation would also provide a 2nd way of graphically indicating the climb angle via the use of the array of dots. This would eliminate over-correction and go-arounds.
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Intellectual Property, Publication Form Disclosure No.: 14-CR-00727
Date: 14 OCT 2014
The innovation idea is to provide information to the crew that is not currently available to them today (climb angle, speed and time to impact). It would also provide a graphical RTC by showing the crew how high they need to fly the A/C to be within a safe margin. The innovation would also provide a 2nd way of graphically indicating the climb angle via the use of the array of dots. This would eliminate over-correction and go-arounds (refer figure 5) which would save our customers fuel, money and time. A bonus advantage to this innovation is the fact that since it shows the RTC angle via the 2 intersecting lines on VSD, then it provides a more accurate picture to the flight crew of why a pull up alert is being annunciated. This would reduce the assumptions by flight crews of alerts being nuisance alerts since they would see the alerts are real threats to the aircraft.
The current TAWS solution shows the PPOS (present position) of the aircraft and also shows the alerted terrain and or obstacles. During flight, whenever an alerting condition is encountered, both voice and visual alerts are annunciated to the flight crew. However, the current TAWS solution only generates the "PULL UP" annunciation but does not indicate to the flight crew any of the following crucial information:
• An indication of how much pull up elevation is required,
• How much time is before impact, or
• What speed is required to avoid the terrain/obstacle impact.
Due to this lacking information, it is possible that flight crew could take some or all of the actions below which might result in a catastrophe:
• The crew might excessively pull up the nose of the aircraft leading to loss of airspeed and possibly lead to the aircraft stalling.
• In those cases where terrain is close to an airport, and the terrain is in or close to glideslope, then, the crew might overcorrect and make more climb than required which would end up in go-arounds leading to wasted fuel and time.
This Innovation Idea proposes several ways to solve this problem:
• It is feasible to provide textual information on the TAWS window to help the flight crew. This information would include crucial data such as the required elevation climb to avoid impact, the time to impact and speed required to avoid impact. Figure 1 and 2 below shows an example of depicting this crucial information to the crew.
• In addition to the text, one would envision a situation whereby the Vertical Situation Display (VSD) automatically pops up (if not already present) when in alerting condition. Apart from the typical vertical depiction of the terrain, this VSD window would also depict 2 intersecting solid lines that would indicate the RTC (Required Terrain Clearance) angle and climb. This RTC angle is the minimum angle required for the flight crew to Pull-up in order to avoid imp...