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An air carrier MD80 super 80 flight crew executes a terrain avoidance maneuver after beginning an assigned descent over a mountain known to cause such warnings. The maneuver causes the engines to exceed their pressure limits requiring maintenance action.
| Attributes | |
| ACN | 428677 |
| Time | |
| Date | 199902 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : sfo airport : oak |
| State Reference | CA |
| Altitude | msl bound lower : 5000 msl bound upper : 6000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Super 80 |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 428677 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial |
| ASRS Report | 428678 |
| Events | |
| Anomaly | other anomaly other other spatial deviation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Supplementary | |
| Air Traffic Incident | other |
| Situations | |
| ATC Facility | procedure or policy : unspecified |
Narrative:
On the locke 1 arrival to oak in IFR conditions descending to 5000 ft MSL, GPWS announced 'terrain, terrain.' I executed the terrain avoidance maneuver subsequent landing was uneventful. A phone call was placed to bay approach. He advised there was no loss of separation. He also said that GPWS events do occur now and then on this arrival due to bay's airspace restrs that require aircraft to overfly a local peak, which rises above 3800 ft. Supplemental information from acn 428678: escape maneuver is initiated and a climb back to 6000 ft. During escape maneuver, both engines reach a peak EPR of 2.2. Maintenance removes aircraft from service and then extended flight was canceled. This was an ATC induced escape maneuver that is not necessary and happens all too often on this approach. Oak personnel say company had 3 of these escape maneuvers recently and jump seating, other air carrier pilot said it happened to him also. I suggest a minimum altitude of 6000 ft until through the oak VOR 030 degree radial to avoid costly unnecessary GPWS alerts from mount diablo.
Original NASA ASRS Text
Title: AN ACR MD80 SUPER 80 FLC EXECUTES A TERRAIN AVOIDANCE MANEUVER AFTER BEGINNING AN ASSIGNED DSCNT OVER A MOUNTAIN KNOWN TO CAUSE SUCH WARNINGS. THE MANEUVER CAUSES THE ENGS TO EXCEED THEIR PRESSURE LIMITS REQUIRING MAINT ACTION.
Narrative: ON THE LOCKE 1 ARR TO OAK IN IFR CONDITIONS DSNDING TO 5000 FT MSL, GPWS ANNOUNCED 'TERRAIN, TERRAIN.' I EXECUTED THE TERRAIN AVOIDANCE MANEUVER SUBSEQUENT LNDG WAS UNEVENTFUL. A PHONE CALL WAS PLACED TO BAY APCH. HE ADVISED THERE WAS NO LOSS OF SEPARATION. HE ALSO SAID THAT GPWS EVENTS DO OCCUR NOW AND THEN ON THIS ARR DUE TO BAY'S AIRSPACE RESTRS THAT REQUIRE ACFT TO OVERFLY A LCL PEAK, WHICH RISES ABOVE 3800 FT. SUPPLEMENTAL INFO FROM ACN 428678: ESCAPE MANEUVER IS INITIATED AND A CLB BACK TO 6000 FT. DURING ESCAPE MANEUVER, BOTH ENGS REACH A PEAK EPR OF 2.2. MAINT REMOVES ACFT FROM SVC AND THEN EXTENDED FLT WAS CANCELED. THIS WAS AN ATC INDUCED ESCAPE MANEUVER THAT IS NOT NECESSARY AND HAPPENS ALL TOO OFTEN ON THIS APCH. OAK PERSONNEL SAY COMPANY HAD 3 OF THESE ESCAPE MANEUVERS RECENTLY AND JUMP SEATING, OTHER ACR PLT SAID IT HAPPENED TO HIM ALSO. I SUGGEST A MINIMUM ALT OF 6000 FT UNTIL THROUGH THE OAK VOR 030 DEG RADIAL TO AVOID COSTLY UNNECESSARY GPWS ALERTS FROM MOUNT DIABLO.
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.