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MD88 crew executed a GPWS emergency escape maneuver with climb until the GPWS terrain warning stopped. Aircraft was above the MVA at the time of occurrence in nct class B airspace.
| Attributes | |
| ACN | 569040 |
| Time | |
| Date | 200212 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| State Reference | CA |
| Altitude | msl single value : 3200 |
| Environment | |
| Flight Conditions | IMC |
| Weather Elements | Rain Turbulence |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | MD-88 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 11 other other vortac |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument precision approach : traffic pattern arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 90 flight time total : 5000 flight time type : 1000 |
| ASRS Report | 569040 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 85 flight time total : 11700 flight time type : 85 |
| ASRS Report | 568769 |
| Events | |
| Anomaly | aircraft equipment problem : critical inflight encounter : weather inflight encounter other |
| Independent Detector | aircraft equipment : gpws other flight crewa other flight crewb |
| Resolutory Action | none taken : detected after the fact other |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | Aircraft FAA Weather |
| Primary Problem | FAA |
Narrative:
While on base leg for the ILS runway 11 approach, and level at 3200 ft MSL, received a GPWS 'terrain, pull up' warning. Initiated immediate climb, and informed ATC. They replied that we were clear of traffic to 5000 ft. Terrain warning ceased at approximately 3500-3700 ft. ATC stated terrain should not have been a factor at our position. Leveled at approximately 4200 ft and descended/reclred to 4000 ft. Remainder of flight uneventful. Our guess was that the unstable atmospheric conditions (frontal passage) and associated turbulence/bumpy ride may have somehow contributed to a false GPWS alert. Supplemental information from acn 568769: on vectors for ILS runway 11 approach to oakland, a terrain GPWS warning sounded. We were level and in IMC. We initiated immediate climb and informed ATC. They informed us that we were clear of traffic up to 5000 ft MSL.
Original NASA ASRS Text
Title: MD88 CREW EXECUTED A GPWS EMER ESCAPE MANEUVER WITH CLB UNTIL THE GPWS TERRAIN WARNING STOPPED. ACFT WAS ABOVE THE MVA AT THE TIME OF OCCURRENCE IN NCT CLASS B AIRSPACE.
Narrative: WHILE ON BASE LEG FOR THE ILS RWY 11 APCH, AND LEVEL AT 3200 FT MSL, RECEIVED A GPWS 'TERRAIN, PULL UP' WARNING. INITIATED IMMEDIATE CLB, AND INFORMED ATC. THEY REPLIED THAT WE WERE CLR OF TFC TO 5000 FT. TERRAIN WARNING CEASED AT APPROX 3500-3700 FT. ATC STATED TERRAIN SHOULD NOT HAVE BEEN A FACTOR AT OUR POS. LEVELED AT APPROX 4200 FT AND DSNDED/RECLRED TO 4000 FT. REMAINDER OF FLT UNEVENTFUL. OUR GUESS WAS THAT THE UNSTABLE ATMOSPHERIC CONDITIONS (FRONTAL PASSAGE) AND ASSOCIATED TURB/BUMPY RIDE MAY HAVE SOMEHOW CONTRIBUTED TO A FALSE GPWS ALERT. SUPPLEMENTAL INFO FROM ACN 568769: ON VECTORS FOR ILS RWY 11 APCH TO OAKLAND, A TERRAIN GPWS WARNING SOUNDED. WE WERE LEVEL AND IN IMC. WE INITIATED IMMEDIATE CLB AND INFORMED ATC. THEY INFORMED US THAT WE WERE CLR OF TFC UP TO 5000 FT MSL.
Data retrieved from NASA's ASRS site as of July 2007 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.