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Flight crew of an medium large transport climbed in response to a GPWS warning during a vector heading for an approach.
| Attributes | |
| ACN | 289011 |
| Time | |
| Date | 199411 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : slc |
| State Reference | UT |
| Altitude | msl bound lower : 8000 msl bound upper : 8300 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : slc tower : sna |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 209 flight time total : 11375 flight time type : 1900 |
| ASRS Report | 289011 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other other spatial deviation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : took evasive action |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Salt lake city approach area, ILS 34 downwind. 8000 ft MSL, speed 170 KIAS (assigned), heading 175 degrees (assigned). GPWS warning 'too low terrain' at 8000 ft MSL so I climbed to approximately 9000 ft MSL to silence the warning (SOP for my carrier). I descended back to 8000 ft MSL when assured by the approach control that there was no danger from terrain in that area. Second warning 'too low terrain' while again at 8000 ft MSL 3-4 mi southeast of first warning. This warning stopped at approximately 8300 ft MSL. During the second warning, while turning, I saw the ground through a broken cloud deck well below my altitude. I believe that the GPWS malfunctioned but investigation of this incident may discover some other problem area.
Original NASA ASRS Text
Title: FLC OF AN MLG CLBED IN RESPONSE TO A GPWS WARNING DURING A VECTOR HDG FOR AN APCH.
Narrative: SALT LAKE CITY APCH AREA, ILS 34 DOWNWIND. 8000 FT MSL, SPD 170 KIAS (ASSIGNED), HDG 175 DEGS (ASSIGNED). GPWS WARNING 'TOO LOW TERRAIN' AT 8000 FT MSL SO I CLBED TO APPROX 9000 FT MSL TO SILENCE THE WARNING (SOP FOR MY CARRIER). I DSNDED BACK TO 8000 FT MSL WHEN ASSURED BY THE APCH CTL THAT THERE WAS NO DANGER FROM TERRAIN IN THAT AREA. SECOND WARNING 'TOO LOW TERRAIN' WHILE AGAIN AT 8000 FT MSL 3-4 MI SE OF FIRST WARNING. THIS WARNING STOPPED AT APPROX 8300 FT MSL. DURING THE SECOND WARNING, WHILE TURNING, I SAW THE GND THROUGH A BROKEN CLOUD DECK WELL BELOW MY ALT. I BELIEVE THAT THE GPWS MALFUNCTIONED BUT INVESTIGATION OF THIS INCIDENT MAY DISCOVER SOME OTHER PROB AREA.
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.