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A320 flight crew experiences a terrain warning at 5100 feet south of sjc in night IMC; while being vectored by nct. Evasive action is taken by the crew; climbing to 6000 feet although nct states that 5100 feet is the correct MVA for that area. The captain believes the turbulence may have been a factor in the false terrain warning.
| Attributes | |
| ACN | 1226023 |
| Time | |
| Date | 201412 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | SJC.Airport |
| State Reference | CA |
| Environment | |
| Flight Conditions | IMC |
| Aircraft 1 | |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | GPWS |
| Person 1 | |
| Function | First Officer Pilot Flying |
| Experience | Flight Crew Last 90 Days 93 Flight Crew Total 6059 Flight Crew Type 46 |
| Person 2 | |
| Function | Pilot Not Flying Captain |
| Experience | Flight Crew Last 90 Days 85 Flight Crew Total 1500 Flight Crew Type 1900 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Inflight Event / Encounter Weather / Turbulence |
Narrative:
We were being vectored for an ILS approach to 12R in sjc. The conditions where IMC with moderate turbulence. The norcal controller cleared us to descend to 5100 and cleared us direct to jesen intersection. While level we received a GPWS terrain/terrain. I was the pilot flying so I performed the terrain escape maneuver per [company procuedures] and climbed approximately 900 feet. ATC was notified and she responded that the minimum vectoring altitude for the area we were [at] was 5100 feet; she then told us to descend to 4700 feet so we descended back down to 4700 feet and were given a heading of 310 and continued vectoring for the approach and landed without incident.
Original NASA ASRS Text
Title: A320 flight crew experiences a terrain warning at 5100 feet south of SJC in night IMC; while being vectored by NCT. Evasive action is taken by the crew; climbing to 6000 feet although NCT states that 5100 feet is the correct MVA for that area. The Captain believes the turbulence may have been a factor in the false terrain warning.
Narrative: We were being vectored for an ILS approach to 12R in SJC. The conditions where IMC with moderate turbulence. The NorCal controller cleared us to descend to 5100 and cleared us direct to JESEN intersection. While level we received a GPWS terrain/terrain. I was the pilot flying so I performed the terrain escape maneuver per [company procuedures] and climbed approximately 900 feet. ATC was notified and she responded that the Minimum Vectoring Altitude for the area we were [at] was 5100 feet; she then told us to descend to 4700 feet so we descended back down to 4700 feet and were given a heading of 310 and continued vectoring for the approach and landed without incident.
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.