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An MD11 on approach at 3600 ft received a GPWS 'terrain, terrain' warning and initiated evasive action to 5500 ft. Crew suspected a false GPWS warning due to terrain at point of warning only 2000 ft.
| Attributes | |
| ACN | 421391 |
| Time | |
| Date | 199812 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : pdx |
| State Reference | OR |
| Altitude | msl bound lower : 3600 msl bound upper : 3600 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | DC-10 Undifferentiated or Other Model |
| Navigation In Use | Other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Experience | flight time last 90 days : 150 flight time total : 14000 flight time type : 2000 |
| ASRS Report | 421391 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Air Traffic Incident | other |
Narrative:
Being vectored inbound to pdx for ILS runway 10R, descending from 5000 ft MSL direct to 3500 ft MSL slowing from 230 KTS direct to 210 KTS with slats and speed brakes deployed. At 3650 ft received 'terrain, terrain' GPWS alert, initiated standard recovery technique to approximately 5500 ft MSL. Aware of only 2000 ft terrain in area, within 4 mi of intercepting localizer course inbound, normal vectoring altitude for this area, suspect equipment malfunction.
Original NASA ASRS Text
Title: AN MD11 ON APCH AT 3600 FT RECEIVED A GPWS 'TERRAIN, TERRAIN' WARNING AND INITIATED EVASIVE ACTION TO 5500 FT. CREW SUSPECTED A FALSE GPWS WARNING DUE TO TERRAIN AT POINT OF WARNING ONLY 2000 FT.
Narrative: BEING VECTORED INBOUND TO PDX FOR ILS RWY 10R, DSNDING FROM 5000 FT MSL DIRECT TO 3500 FT MSL SLOWING FROM 230 KTS DIRECT TO 210 KTS WITH SLATS AND SPD BRAKES DEPLOYED. AT 3650 FT RECEIVED 'TERRAIN, TERRAIN' GPWS ALERT, INITIATED STANDARD RECOVERY TECHNIQUE TO APPROX 5500 FT MSL. AWARE OF ONLY 2000 FT TERRAIN IN AREA, WITHIN 4 MI OF INTERCEPTING LOC COURSE INBOUND, NORMAL VECTORING ALT FOR THIS AREA, SUSPECT EQUIP MALFUNCTION.
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.