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Supposed false warning from the GPWS creates an evasive action climb reaction with an A-320 flight crew.
| Attributes | |
| ACN | 293552 |
| Time | |
| Date | 199501 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : lax |
| State Reference | CA |
| Altitude | msl bound lower : 7000 msl bound upper : 7000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : lax |
| Operator | common carrier : air carrier |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | B747 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 14500 flight time type : 1500 |
| ASRS Report | 293552 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 6000 vertical : 0 |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Too low terrain warning sounded. We were descending through 7000 ft (1500 FPM) on a 210 degree heading from reedr. I initiated a climb and the warning stopped. We were in the clouds but after the warning stopped we broke out of the clouds just long enough to see that we were over water. There was nothing in the area that could have caused the GPWS to give this warning. A 747 passed just behind us, at our altitude, at about the same time. Center pointed the 747 out to us and we saw it on TCASII. We did not get a TCASII warning. I think the 747 caused the GPWS warning.
Original NASA ASRS Text
Title: SUPPOSED FALSE WARNING FROM THE GPWS CREATES AN EVASIVE ACTION CLB REACTION WITH AN A-320 FLC.
Narrative: TOO LOW TERRAIN WARNING SOUNDED. WE WERE DSNDING THROUGH 7000 FT (1500 FPM) ON A 210 DEG HDG FROM REEDR. I INITIATED A CLB AND THE WARNING STOPPED. WE WERE IN THE CLOUDS BUT AFTER THE WARNING STOPPED WE BROKE OUT OF THE CLOUDS JUST LONG ENOUGH TO SEE THAT WE WERE OVER WATER. THERE WAS NOTHING IN THE AREA THAT COULD HAVE CAUSED THE GPWS TO GIVE THIS WARNING. A 747 PASSED JUST BEHIND US, AT OUR ALT, AT ABOUT THE SAME TIME. CTR POINTED THE 747 OUT TO US AND WE SAW IT ON TCASII. WE DID NOT GET A TCASII WARNING. I THINK THE 747 CAUSED THE GPWS WARNING.
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.