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GPWS warning. Corrective action applied. No apparent terrain clearance relationship. Possible false warning due to heavy rain, hail or system malfunction.
| Attributes | |
| ACN | 330236 |
| Time | |
| Date | 199603 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : sjc |
| State Reference | CA |
| Altitude | msl bound lower : 4500 msl bound upper : 6500 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : oak |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 10000 flight time type : 4000 |
| ASRS Report | 330236 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | other anomaly other other spatial deviation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action flight crew : exited adverse environment other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Weather |
| Air Traffic Incident | other |
Narrative:
Approximately 11 DME southwest of sjc VORTAC, IMC conditions, 4500 ft MSL, turning from heading 140 degrees to 360 degrees received GPWS warning, 'terrain, terrain.' started pull-up and power increase immediately. At second activation of warning pulled aircraft pitch to stick shaker and power levers to go around power. Climbed approximately 2000 ft and notified ATC of deviation. Reentered and descended on downwind for uneventful approach and landing to runway 12 at sjc. Unable to give PA to passenger or advise flight attendants due to block in time constraints. Called TRACON supervisor after landing and he stated that this seemed to be occurring primarily to our air carrier aircraft. He also stated that MVA for that sector was 4100 ft. He also stated that they were treating this as an equipment malfunction. I asked him to save the tapes. Some passenger deplaned before we were able to stand in cockpit doorway and explain to the passenger that since we were in clouds we have to treat the warning as valid and maneuver the aircraft so abruptly.
Original NASA ASRS Text
Title: GPWS WARNING. CORRECTIVE ACTION APPLIED. NO APPARENT TERRAIN CLRNC RELATIONSHIP. POSSIBLE FALSE WARNING DUE TO HVY RAIN, HAIL OR SYS MALFUNCTION.
Narrative: APPROX 11 DME SW OF SJC VORTAC, IMC CONDITIONS, 4500 FT MSL, TURNING FROM HDG 140 DEGS TO 360 DEGS RECEIVED GPWS WARNING, 'TERRAIN, TERRAIN.' STARTED PULL-UP AND PWR INCREASE IMMEDIATELY. AT SECOND ACTIVATION OF WARNING PULLED ACFT PITCH TO STICK SHAKER AND PWR LEVERS TO GAR PWR. CLBED APPROX 2000 FT AND NOTIFIED ATC OF DEV. REENTERED AND DSNDED ON DOWNWIND FOR UNEVENTFUL APCH AND LNDG TO RWY 12 AT SJC. UNABLE TO GIVE PA TO PAX OR ADVISE FLT ATTENDANTS DUE TO BLOCK IN TIME CONSTRAINTS. CALLED TRACON SUPVR AFTER LNDG AND HE STATED THAT THIS SEEMED TO BE OCCURRING PRIMARILY TO OUR ACR ACFT. HE ALSO STATED THAT MVA FOR THAT SECTOR WAS 4100 FT. HE ALSO STATED THAT THEY WERE TREATING THIS AS AN EQUIP MALFUNCTION. I ASKED HIM TO SAVE THE TAPES. SOME PAX DEPLANED BEFORE WE WERE ABLE TO STAND IN COCKPIT DOORWAY AND EXPLAIN TO THE PAX THAT SINCE WE WERE IN CLOUDS WE HAVE TO TREAT THE WARNING AS VALID AND MANEUVER THE ACFT SO ABRUPTLY.
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.