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A large transport's egpws alerted pull up on the bzn ILS DME 12 at 11;000 feet. The first officer took the appropriated action and the alert ceased at 14;000 feet. The terrain beneath the aircraft rose to about 9;400 feet which may have activated the terrain closure feature.
| Attributes | |
| ACN | 1301209 |
| Time | |
| Date | 201510 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | BZN.Airport |
| State Reference | MT |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Large Transport Low Wing 2 Turbojet Eng |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | GPWS |
| Person 1 | |
| Function | First Officer Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 194 Flight Crew Type 595 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Inflight Event / Encounter CFTT / CFIT |
Narrative:
While doing a DME arc to ILS 12 to bzn we were cleared to descend to 11;000 feet. During level flight we received a GPWS 'pull up' oral warning. I immediately complied with the oral warning and engaged in a GPWS escape maneuver. Once we leveled off at 14;000 feet it became evident that we were clear of terrain. We immediately advised ATC of our GPWS escape maneuver and return to the previously assigned altitude.
Original NASA ASRS Text
Title: A large transport's EGPWS alerted PULL UP on the BZN ILS DME 12 at 11;000 feet. The First Officer took the appropriated action and the alert ceased at 14;000 feet. The terrain beneath the aircraft rose to about 9;400 feet which may have activated the terrain closure feature.
Narrative: While doing a DME arc to ILS 12 to BZN we were cleared to descend to 11;000 feet. During level flight we received a GPWS 'PULL up' oral warning. I immediately complied with the oral warning and engaged in a GPWS escape maneuver. Once we leveled off at 14;000 feet it became evident that we were clear of terrain. We immediately advised ATC of our GPWS escape maneuver and return to the previously assigned altitude.
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.