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GPWS 'terrain, pull up' warning while in cruise. Flight crew followed the RA command and climbed. False warning attributed to heavy rain and icing.
| Attributes | |
| ACN | 322553 |
| Time | |
| Date | 199512 |
| Day | Wed |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | atc facility : zbw |
| State Reference | MA |
| Altitude | msl bound lower : 6000 msl bound upper : 7000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : pbi |
| Operator | common carrier : air taxi |
| Make Model Name | Friendship F27 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | cruise other |
| Route In Use | enroute airway : zbw |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air taxi |
| Function | flight crew : first officer |
| Qualification | pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 192 flight time total : 4350 flight time type : 1440 |
| ASRS Report | 322553 |
| Person 2 | |
| Affiliation | company : air taxi |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Weather |
| Air Traffic Incident | other |
Narrative:
During cruise flight at 6000 ft MSL our GPWS warning system sounded 'terrain, terrain, pull up, pull up.' I reacted to the warning because we were in IMC conditions. We immediately initiated climb to 7000 ft. During this climb the GPWS stopped. ATC was advised of this action immediately. There was agreement and coordinated action between the crew members. Callback conversation with reporter revealed the following information: reporter first officer, upon looking back, knew that there was no high terrain in the area of the GPWS. The flight crew says they were in heavy rain and icing conditions which could have caused the false warning. Aircraft was a fairchild F27.
Original NASA ASRS Text
Title: GPWS 'TERRAIN, PULL UP' WARNING WHILE IN CRUISE. FLC FOLLOWED THE RA COMMAND AND CLBED. FALSE WARNING ATTRIBUTED TO HVY RAIN AND ICING.
Narrative: DURING CRUISE FLT AT 6000 FT MSL OUR GPWS WARNING SYS SOUNDED 'TERRAIN, TERRAIN, PULL UP, PULL UP.' I REACTED TO THE WARNING BECAUSE WE WERE IN IMC CONDITIONS. WE IMMEDIATELY INITIATED CLB TO 7000 FT. DURING THIS CLB THE GPWS STOPPED. ATC WAS ADVISED OF THIS ACTION IMMEDIATELY. THERE WAS AGREEMENT AND COORDINATED ACTION BTWN THE CREW MEMBERS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR FO, UPON LOOKING BACK, KNEW THAT THERE WAS NO HIGH TERRAIN IN THE AREA OF THE GPWS. THE FLC SAYS THEY WERE IN HVY RAIN AND ICING CONDITIONS WHICH COULD HAVE CAUSED THE FALSE WARNING. ACFT WAS A FAIRCHILD F27.
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.