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Air carrier flight crew responded to the warning commands of the aircraft GPWS and climbed above assigned altitude.
| Attributes | |
| ACN | 204159 |
| Time | |
| Date | 199203 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : bna |
| State Reference | TN |
| Altitude | msl bound lower : 8000 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zme artcc : zoa |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : flight engineer pilot : cfi |
| Experience | flight time last 90 days : 80 flight time total : 10000 flight time type : 80 |
| ASRS Report | 204159 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 160 flight time total : 8050 flight time type : 650 |
| ASRS Report | 203968 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | aircraft : equipment problem dissipated controller : issued new clearance flight crew : overcame equipment problem |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
We were level at 8000 MSL, heading north about 50 mi north of bna. We were deviating around thunderstorms for a return vector to bna when the GPWS terrain alert sounded. Initial response was an assumed glitch in the GPWS system, being that the highest terrain in the vicinity is less than 3000 ft. The GPWS then repeated terrain and then 'pull up' warning. Even though a GPWS malfunction was suspected, a climb to 10000 ft was commenced as a precaution. Memphis ARTCC was advised, and they concurred our altitude at 8000 ft climbing to 1000 ft. We were advised that no other traffic existed within 60 mi of our position.
Original NASA ASRS Text
Title: ACR FLC RESPONDED TO THE WARNING COMMANDS OF THE ACFT GPWS AND CLIMBED ABOVE ASSIGNED ALT.
Narrative: WE WERE LEVEL AT 8000 MSL, HDG N ABOUT 50 MI N OF BNA. WE WERE DEVIATING AROUND TSTMS FOR A RETURN VECTOR TO BNA WHEN THE GPWS TERRAIN ALERT SOUNDED. INITIAL RESPONSE WAS AN ASSUMED GLITCH IN THE GPWS SYS, BEING THAT THE HIGHEST TERRAIN IN THE VICINITY IS LESS THAN 3000 FT. THE GPWS THEN REPEATED TERRAIN AND THEN 'PULL UP' WARNING. EVEN THOUGH A GPWS MALFUNCTION WAS SUSPECTED, A CLB TO 10000 FT WAS COMMENCED AS A PRECAUTION. MEMPHIS ARTCC WAS ADVISED, AND THEY CONCURRED OUR ALT AT 8000 FT CLBING TO 1000 FT. WE WERE ADVISED THAT NO OTHER TFC EXISTED WITHIN 60 MI OF OUR POS.
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.