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Air carrier first officer reported a terrain warning on approach to tus that did not appear to be valid.
| Attributes | |
| ACN | 1623842 |
| Time | |
| Date | 201902 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | TUS.Airport |
| State Reference | AZ |
| Environment | |
| Flight Conditions | IMC |
| Aircraft 1 | |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Route In Use | Vectors |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | GPWS |
| Person 1 | |
| Function | First Officer Pilot Flying |
| Qualification | Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Commercial |
| Experience | Flight Crew Total 3300 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Inflight Event / Encounter CFTT / CFIT |
Narrative:
During descent into tus we received an egpws red terrain warning and took evasive action. We had been flying the zonna 1 RNAV into tus and had just received vectors off the STAR; approximately 20 miles east southeast of tus; and a descent to 10;000 feet MSL. While flying level; unaccelerated flight at 250 KIAS in IMC; we received a red egpws 'pull up; terrain' warning. There was no preceding yellow terrain proximity cues. I initiated the climb maneuver and then saw the captain joining me on the controls; at which point I verbally gave him control of the aircraft. We climbed approximately 5;000 feet before leveling off. We informed ATC of the reason for excursion and were informed by ATC that they have had several aircraft recently react to egpws events in that area. He also told us the MVA; MSA; and highest peaks in the area and informed us that we were never below the peaks on our path. We received extended vectors north of tucson to facilitate our descent and approach; which from that point on were uneventful.either there is an error in the database that is causing these warnings going into tucson; or there is too little margin of error on the vectors. It needs to be determined if there is something wrong with the database and if so; it should be corrected before an injury occurs.
Original NASA ASRS Text
Title: Air carrier First Officer reported a terrain warning on approach to TUS that did not appear to be valid.
Narrative: During descent into TUS we received an EGPWS red terrain warning and took evasive action. We had been flying the ZONNA 1 RNAV into TUS and had just received vectors off the STAR; approximately 20 miles east southeast of TUS; and a descent to 10;000 feet MSL. While flying level; unaccelerated flight at 250 KIAS in IMC; we received a red EGPWS 'Pull Up; Terrain' warning. There was no preceding yellow terrain proximity cues. I initiated the climb maneuver and then saw the Captain joining me on the controls; at which point I verbally gave him control of the aircraft. We climbed approximately 5;000 feet before leveling off. We informed ATC of the reason for excursion and were informed by ATC that they have had several aircraft recently react to EGPWS events in that area. He also told us the MVA; MSA; and highest peaks in the area and informed us that we were never below the peaks on our path. We received extended vectors north of Tucson to facilitate our descent and approach; which from that point on were uneventful.Either there is an error in the database that is causing these warnings going into Tucson; or there is too little margin of error on the vectors. It needs to be determined if there is something wrong with the database and if so; it should be corrected before an injury occurs.
Data retrieved from NASA's ASRS site 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.