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Flight crew of medium large transport advanced had GPWS alert when supposedly at proper altitude for backcourse approach to runway 32 at mfr.
| Attributes | |
| ACN | 164467 |
| Time | |
| Date | 199012 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : mfr airport : mfd |
| State Reference | OR |
| Altitude | msl bound lower : 8700 msl bound upper : 8800 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : mfr |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 6200 flight time type : 700 |
| ASRS Report | 164467 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : commercial pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 13000 flight time type : 200 |
| ASRS Report | 164468 |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action flight crew : exited adverse environment |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
We were cleared for the localizer backcourse DME-B at mfr. We were to maintain 9000' till ashie (18 DME), then cleared on the profile down to 8500' till 16 DME. At approximately 8750' MSL we received a ground proximity warning for terrain. We immediately executed a missed approach and climbed to 12000' MSL because we had noted the MSA of 10500' MSL. We notified approach control and requested an ILS to runway 13 which we received and flew to an uneventful landing. Upon landing we called approach to see what the highest altitude was in that sector and they told us to was mt ashland at 7651' MSL. Our charts show the highest terrain at 7533' MSL.
Original NASA ASRS Text
Title: FLT CREW OF MLG ADVANCED HAD GPWS ALERT WHEN SUPPOSEDLY AT PROPER ALT FOR BACKCOURSE APCH TO RWY 32 AT MFR.
Narrative: WE WERE CLRED FOR THE LOC BACKCOURSE DME-B AT MFR. WE WERE TO MAINTAIN 9000' TILL ASHIE (18 DME), THEN CLRED ON THE PROFILE DOWN TO 8500' TILL 16 DME. AT APPROX 8750' MSL WE RECEIVED A GND PROX WARNING FOR TERRAIN. WE IMMEDIATELY EXECUTED A MISSED APCH AND CLBED TO 12000' MSL BECAUSE WE HAD NOTED THE MSA OF 10500' MSL. WE NOTIFIED APCH CTL AND REQUESTED AN ILS TO RWY 13 WHICH WE RECEIVED AND FLEW TO AN UNEVENTFUL LNDG. UPON LNDG WE CALLED APCH TO SEE WHAT THE HIGHEST ALT WAS IN THAT SECTOR AND THEY TOLD US TO WAS MT ASHLAND AT 7651' MSL. OUR CHARTS SHOW THE HIGHEST TERRAIN AT 7533' MSL.
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.