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B757-200 terrain warning activated during climbout. All indications pointed to the fact that this was a false warning from the GPWS.
| Attributes | |
| ACN | 780821 |
| Time | |
| Date | 200803 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzzz.airport |
| State Reference | FO |
| Altitude | msl single value : 16000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : takeoff climbout : intermediate altitude |
| Route In Use | departure sid : n/s |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 780821 |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | aircraft equipment : gpws other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
While climbing through 16000-17500 ft; heading 193 degrees on track on the departure; we received multiple 'too low terrain' indications; then all clear. About 5 seconds later; we got the command 'terrain; terrain; pull up; pull up.' we were VFR with unlimited visibility. Egpws display in 10 mi scale was green with highest terrain displayed greater than 2000 ft below us. High terrain was off our left wing and behind us. The radio altimeter displayed nothing. At no time had our rate of climb been less than 1000 FPM. The terrain system was deactivated until cruise altitude; then reactivated. Seemed to work normally the remainder of the flight.
Original NASA ASRS Text
Title: B757-200 TERRAIN WARNING ACTIVATED DURING CLIMBOUT. ALL INDICATIONS POINTED TO THE FACT THAT THIS WAS A FALSE WARNING FROM THE GPWS.
Narrative: WHILE CLBING THROUGH 16000-17500 FT; HDG 193 DEGS ON TRACK ON THE DEP; WE RECEIVED MULTIPLE 'TOO LOW TERRAIN' INDICATIONS; THEN ALL CLR. ABOUT 5 SECONDS LATER; WE GOT THE COMMAND 'TERRAIN; TERRAIN; PULL UP; PULL UP.' WE WERE VFR WITH UNLIMITED VISIBILITY. EGPWS DISPLAY IN 10 MI SCALE WAS GREEN WITH HIGHEST TERRAIN DISPLAYED GREATER THAN 2000 FT BELOW US. HIGH TERRAIN WAS OFF OUR L WING AND BEHIND US. THE RADIO ALTIMETER DISPLAYED NOTHING. AT NO TIME HAD OUR RATE OF CLB BEEN LESS THAN 1000 FPM. THE TERRAIN SYS WAS DEACTIVATED UNTIL CRUISE ALT; THEN REACTIVATED. SEEMED TO WORK NORMALLY THE REMAINDER OF THE FLT.
Data retrieved from NASA's ASRS site as of May 2009 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.