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B737 flight crew during vectors to final approach receives a GPWS 'terrain' alert. Flight crew executes terrain avoidance maneuver and receives new vector clearance to final.
| Attributes | |
| ACN | 689212 |
| Time | |
| Date | 200603 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : oak.airport |
| State Reference | CA |
| Altitude | msl single value : 3600 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : nct.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 100 flight time total : 12000 flight time type : 8000 |
| ASRS Report | 689212 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Experience | flight time last 90 days : 110 flight time total : 6100 flight time type : 300 |
| ASRS Report | 689283 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude other anomaly other |
| Independent Detector | aircraft equipment : gpws other flight crewa other flight crewb |
| Resolutory Action | controller : issued new clearance flight crew : took precautionary avoidance action |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance Airspace Structure |
| Primary Problem | Ambiguous |
Narrative:
On approach to oak runway 11; was vectored across final at an altitude of 3600 ft. After crossing the extended final approach; we received a terrain warning. MSA in the area was 3800 ft. We executed a terrain warning evasive maneuver and climbed to 4500 ft; notified ATC of the warning and evasive action we had taken. ATC acknowledged our call but did not say any problems were encountered with our actions. They gave us another vector back to the runway approach course and a descent to 3000 ft to join the approach for the ILS runway 11. We intercepted the course and landed without further problems. Supplemental information from acn 689283: with approach being vectored from the northeast through the localizer runway 11 in oak.
Original NASA ASRS Text
Title: B737 FLT CREW DURING VECTORS TO FINAL APCH RECEIVES A GPWS 'TERRAIN' ALERT. FLT CREW EXECUTES TERRAIN AVOIDANCE MANEUVER AND RECEIVES NEW VECTOR CLRNC TO FINAL.
Narrative: ON APCH TO OAK RWY 11; WAS VECTORED ACROSS FINAL AT AN ALT OF 3600 FT. AFTER XING THE EXTENDED FINAL APCH; WE RECEIVED A TERRAIN WARNING. MSA IN THE AREA WAS 3800 FT. WE EXECUTED A TERRAIN WARNING EVASIVE MANEUVER AND CLBED TO 4500 FT; NOTIFIED ATC OF THE WARNING AND EVASIVE ACTION WE HAD TAKEN. ATC ACKNOWLEDGED OUR CALL BUT DID NOT SAY ANY PROBS WERE ENCOUNTERED WITH OUR ACTIONS. THEY GAVE US ANOTHER VECTOR BACK TO THE RWY APCH COURSE AND A DSCNT TO 3000 FT TO JOIN THE APCH FOR THE ILS RWY 11. WE INTERCEPTED THE COURSE AND LANDED WITHOUT FURTHER PROBS. SUPPLEMENTAL INFO FROM ACN 689283: WITH APCH BEING VECTORED FROM THE NE THROUGH THE LOC RWY 11 IN OAK.
Data retrieved from NASA's ASRS site as of January 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.