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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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An air carrier flight crew reports responding to a GPWS pull up warning and climbing to within 200 ft of the assigned altitude of another aircraft in the vicinity. Upon notification, the approach controller instructed the crew to return immediately to 5000 ft stating that terrain was not a factor.
| Attributes | |
| ACN | 333330 |
| Time | |
| Date | 199604 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : oak |
| State Reference | CA |
| Altitude | msl bound lower : 5000 msl bound upper : 6800 |
| Environment | |
| Flight Conditions | IMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | tracon : oak |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Super 80 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | other : unknown |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 333330 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| ASRS Report | 333329 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : required legal separation 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 other |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 24000 vertical : 200 |
| Supplementary | |
| Primary Problem | Navigational Facility |
| Air Traffic Incident | other |
| Situations | |
| ATC Facility | procedure or policy : unspecified |
Narrative:
We were on a 270 degree radar vector and had just leveled at 5000 ft MSL when the GPWS terrain warning sounded. The autoplt was disconnected and a rapid climb initiated. The warning stopped at approximately 6500 ft and climb was arrested at 6800 ft. I called bay approach during the climb to tell them we were responding to a terrain warning. They responded that terrain was not a factor and requested an immediate descent to 5000 ft. By this time we had leveled off and we expedited descent back to 5000 ft. ATC also informed us that we had traffic close by at 7000 ft. I called bay approach after arrival to discuss our arrival over mt diablo. They say they need us at 5000 ft over mt diablo due to airspace restrs. They also stated that another airlines MD80's also used to get terrain warnings over mt diablo and that the airline has made a GPWS software change to eliminate the problem. I would like to see the routing changed so that we don't have to come in right over the highest point within 50 mi. Supplemental information from acn 333329: received GPWS warning pull up command.
Original NASA ASRS Text
Title: AN ACR FLC RPTS RESPONDING TO A GPWS PULL UP WARNING AND CLBING TO WITHIN 200 FT OF THE ASSIGNED ALT OF ANOTHER ACFT IN THE VICINITY. UPON NOTIFICATION, THE APCH CTLR INSTRUCTED THE CREW TO RETURN IMMEDIATELY TO 5000 FT STATING THAT TERRAIN WAS NOT A FACTOR.
Narrative: WE WERE ON A 270 DEG RADAR VECTOR AND HAD JUST LEVELED AT 5000 FT MSL WHEN THE GPWS TERRAIN WARNING SOUNDED. THE AUTOPLT WAS DISCONNECTED AND A RAPID CLB INITIATED. THE WARNING STOPPED AT APPROX 6500 FT AND CLB WAS ARRESTED AT 6800 FT. I CALLED BAY APCH DURING THE CLB TO TELL THEM WE WERE RESPONDING TO A TERRAIN WARNING. THEY RESPONDED THAT TERRAIN WAS NOT A FACTOR AND REQUESTED AN IMMEDIATE DSCNT TO 5000 FT. BY THIS TIME WE HAD LEVELED OFF AND WE EXPEDITED DSCNT BACK TO 5000 FT. ATC ALSO INFORMED US THAT WE HAD TFC CLOSE BY AT 7000 FT. I CALLED BAY APCH AFTER ARR TO DISCUSS OUR ARR OVER MT DIABLO. THEY SAY THEY NEED US AT 5000 FT OVER MT DIABLO DUE TO AIRSPACE RESTRS. THEY ALSO STATED THAT ANOTHER AIRLINES MD80'S ALSO USED TO GET TERRAIN WARNINGS OVER MT DIABLO AND THAT THE AIRLINE HAS MADE A GPWS SOFTWARE CHANGE TO ELIMINATE THE PROB. I WOULD LIKE TO SEE THE ROUTING CHANGED SO THAT WE DON'T HAVE TO COME IN RIGHT OVER THE HIGHEST POINT WITHIN 50 MI. SUPPLEMENTAL INFO FROM ACN 333329: RECEIVED GPWS WARNING PULL UP COMMAND.
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.