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GPWS alert and flight crew response in accord with airline operational procedure creates a non adherence to ATC clearance during their evasive action climb.
| Attributes | |
| ACN | 346185 |
| Time | |
| Date | 199609 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : mmex |
| State Reference | FO |
| Altitude | msl bound lower : 12000 msl bound upper : 14000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : mex |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Super 80 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | cruise other cruise other |
| Route In Use | arrival other enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 346185 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| ASRS Report | 346186 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude inflight encounter : weather 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 flight crew : exited adverse environment flight crew : declared emergency |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
On arrival we were level at 12000 ft, within 20 mi northeast of mateo VOR. We were on a WX avoidance vector. We flew into some heavy rain. While in the heavy precipitation, we got a GPWS alert for terrain. We responded to the alert with positive rotation to the stick shaker with the throttles firewalled. Both the autoplt and autothrottles were disconnected during the procedure. We climbed to an altitude of approximately 14000 ft before the warning stopped. ATC requested we stop our climb, we were unable to comply due to the alert. We continued to mex and landed under normal conditions. In our debrief we checked our chart and spoke with ATC. Both ATC and our altimeters indicated we were level at 12000 ft. The highest terrain in the sector we were flying through was 10205 ft. After our debrief we concluded we may have had a false GPWS alert or a severe windshear.
Original NASA ASRS Text
Title: GPWS ALERT AND FLC RESPONSE IN ACCORD WITH AIRLINE OPERATIONAL PROC CREATES A NON ADHERENCE TO ATC CLRNC DURING THEIR EVASIVE ACTION CLB.
Narrative: ON ARR WE WERE LEVEL AT 12000 FT, WITHIN 20 MI NE OF MATEO VOR. WE WERE ON A WX AVOIDANCE VECTOR. WE FLEW INTO SOME HVY RAIN. WHILE IN THE HVY PRECIPITATION, WE GOT A GPWS ALERT FOR TERRAIN. WE RESPONDED TO THE ALERT WITH POSITIVE ROTATION TO THE STICK SHAKER WITH THE THROTTLES FIREWALLED. BOTH THE AUTOPLT AND AUTOTHROTTLES WERE DISCONNECTED DURING THE PROC. WE CLBED TO AN ALT OF APPROX 14000 FT BEFORE THE WARNING STOPPED. ATC REQUESTED WE STOP OUR CLB, WE WERE UNABLE TO COMPLY DUE TO THE ALERT. WE CONTINUED TO MEX AND LANDED UNDER NORMAL CONDITIONS. IN OUR DEBRIEF WE CHKED OUR CHART AND SPOKE WITH ATC. BOTH ATC AND OUR ALTIMETERS INDICATED WE WERE LEVEL AT 12000 FT. THE HIGHEST TERRAIN IN THE SECTOR WE WERE FLYING THROUGH WAS 10205 FT. AFTER OUR DEBRIEF WE CONCLUDED WE MAY HAVE HAD A FALSE GPWS ALERT OR A SEVERE WINDSHEAR.
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.