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A dash 8 flight crew responded to an egpws terrain warning while level at 4;000 MSL; 5 NM north of ticon on the leggo RNAV STAR to iad.
| Attributes | |
| ACN | 1122043 |
| Time | |
| Date | 201310 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | IAD.Airport |
| State Reference | DC |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | Dash 8-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Route In Use | STAR LEGGO2 |
| Flight Plan | IFR |
| Person 1 | |
| Function | First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Inflight Event / Encounter CFTT / CFIT |
Narrative:
While on the LEGGO2 arrival at iad; about 5 miles north of ticon intersection at 4;000 MSL; we received a 'terrain; terrain pull up' warning. Due to the fact that we were night IMC and could not visually confirm terrain clearance; we called ATC while climbing to avoid any possible collision. After reaching 4;300 ft. MSL the warning and associated red light extinguished and we were able to return to our assigned altitude. We believed this to have been a false warning due to the fact that we were both on course and altitude for that particular section of the arrival. No further issues were encountered; and a normal landing was accomplished.perhaps more frequent; or more thorough; inspections of our avionics/warning systems would possibly avoid this and other similar false indication situations. This should include exterior components and any associated seals. The rain may have played a large factor as water and electronics do not mix well.
Original NASA ASRS Text
Title: A Dash 8 flight crew responded to an EGPWS terrain warning while level at 4;000 MSL; 5 NM north of TICON on the LEGGO RNAV STAR to IAD.
Narrative: While on the LEGGO2 arrival at IAD; about 5 miles north of TICON Intersection at 4;000 MSL; we received a 'Terrain; Terrain Pull Up' warning. Due to the fact that we were night IMC and could not visually confirm terrain clearance; we called ATC while climbing to avoid any possible collision. After reaching 4;300 FT. MSL the warning and associated red light extinguished and we were able to return to our assigned altitude. We believed this to have been a false warning due to the fact that we were both on course and altitude for that particular section of the arrival. No further issues were encountered; and a normal landing was accomplished.Perhaps more frequent; or more thorough; inspections of our avionics/warning systems would possibly avoid this and other similar false indication situations. This should include exterior components and any associated seals. The rain may have played a large factor as water and electronics do not mix well.
Data retrieved from NASA's ASRS site as of July 2013 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.