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Captain of a widebody transport made a missed approach with an escape maneuver climb when hearing a GPWS warning on an ILS approach.
| Attributes | |
| ACN | 467013 |
| Time | |
| Date | 200003 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| State Reference | FO |
| Altitude | msl single value : 1800 |
| Environment | |
| Flight Conditions | IMC |
| Weather Elements | other |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 3 Turbojet Eng |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 14r other |
| Flight Phase | descent : approach descent : intermediate altitude |
| Route In Use | approach : instrument precision |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 10000 flight time type : 3000 |
| ASRS Report | 467013 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : multi engine pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other other spatial deviation |
| Independent Detector | aircraft equipment other aircraft equipment : gpws other flight crewa other flight crewb |
| Resolutory Action | aircraft : equipment problem dissipated controller : issued new clearance flight crew : executed missed approach flight crew : took evasive action other |
| Consequence | faa : assigned or threatened penalties other |
| Supplementary | |
| Problem Areas | Aircraft Environmental Factor |
| Primary Problem | Aircraft |
Narrative:
We were on base leg, level at 1800 ft MSL, just prior to turning final we received a GPWS warning (terrain, terrain). I executed the escape maneuver, then leveled the aircraft at approximately 2800 ft MSL. I turned right as soon as possible to stay south of prohibited areas rkcp-518, 73A, and 73B. During the escape maneuver we went through the localizer, so I intercepted the localizer from the left side then called the missed approach. Approach control then gave us an assigned heading and altitude of 4000 ft to fly for the miss. On the second approach we were vectored farther away from the airport and given step-down altitudes of 2500 ft, then 1800 ft when turning final. The second approach was uneventful with no GPWS warnings. I suspect a mechanical problem with the aircraft, possibly a radio altimeter fault. I would like to thank seoul approach control for their kind and professional attitude in this matter.
Original NASA ASRS Text
Title: CAPT OF A WDB MADE A MISSED APCH WITH AN ESCAPE MANEUVER CLB WHEN HEARING A GPWS WARNING ON AN ILS APCH.
Narrative: WE WERE ON BASE LEG, LEVEL AT 1800 FT MSL, JUST PRIOR TO TURNING FINAL WE RECEIVED A GPWS WARNING (TERRAIN, TERRAIN). I EXECUTED THE ESCAPE MANEUVER, THEN LEVELED THE ACFT AT APPROX 2800 FT MSL. I TURNED R AS SOON AS POSSIBLE TO STAY S OF PROHIBITED AREAS RKCP-518, 73A, AND 73B. DURING THE ESCAPE MANEUVER WE WENT THROUGH THE LOC, SO I INTERCEPTED THE LOC FROM THE L SIDE THEN CALLED THE MISSED APCH. APCH CTL THEN GAVE US AN ASSIGNED HEADING AND ALT OF 4000 FT TO FLY FOR THE MISS. ON THE SECOND APCH WE WERE VECTORED FARTHER AWAY FROM THE ARPT AND GIVEN STEP-DOWN ALTS OF 2500 FT, THEN 1800 FT WHEN TURNING FINAL. THE SECOND APCH WAS UNEVENTFUL WITH NO GPWS WARNINGS. I SUSPECT A MECHANICAL PROB WITH THE ACFT, POSSIBLY A RADIO ALTIMETER FAULT. I WOULD LIKE TO THANK SEOUL APCH CTL FOR THEIR KIND AND PROFESSIONAL ATTITUDE IN THIS MATTER.
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.