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MD90 crew had a GPWS terrain warning and was advised they were too low by the ATCT local controller at bil.
| Attributes | |
| ACN | 534676 |
| Time | |
| Date | 200201 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : bil.airport |
| State Reference | MI |
| Altitude | msl single value : 4200 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tower : bil.tower |
| Operator | common carrier : air carrier |
| Make Model Name | MD-90 Series (DC-9-90) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : approach |
| Route In Use | approach : visual |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 150 flight time total : 10000 flight time type : 2500 |
| ASRS Report | 534676 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | non adherence : company policies non adherence : far non adherence : published procedure other anomaly other other spatial deviation |
| Independent Detector | atc equipment : msaw atc equipment other atc equipment : radar aircraft equipment : gpws other controllera other flight crewa other flight crewb |
| Resolutory Action | controller : issued new clearance controller : issued alert controller : provided flight assist flight crew : executed missed approach none taken : detected after the fact other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
The captain was hand flying a visual approach to runway 28R at bil after briefing a visual with ILS runway 28R back-up. He briefed that he would join final outside lighted towers that are north of the approach course which are at approximately 4200 ft MSL. During the approach, he said that he would descend to 4000 ft MSL and then initiated the descent to turn inside of the towers. Bil tower asked if we had the towers to our right, to which I replied affirmative and we were turning inside of them. The captain apparently had mistaken our position and seemed confused as the GPWS stated terrain and the radar altimeter read approximately +/-1200 ft. I was unaware of his confusion as I was busy configuring the aircraft and preparing to run the checklist. At approximately the same time that I became aware of the captain's confusion, the tower controller advised us that the airport elevation was 3649 ft MSL. An immediate climb was initiated to approximately 4600 ft MSL and the tower asked us if we intended to overfly the airport and enter the right downwind. The captain, with my help, again found the airport and accomplished the overfly and pattern entry and was coached to a safe landing.
Original NASA ASRS Text
Title: MD90 CREW HAD A GPWS TERRAIN WARNING AND WAS ADVISED THEY WERE TOO LOW BY THE ATCT LCL CTLR AT BIL.
Narrative: THE CAPT WAS HAND FLYING A VISUAL APCH TO RWY 28R AT BIL AFTER BRIEFING A VISUAL WITH ILS RWY 28R BACK-UP. HE BRIEFED THAT HE WOULD JOIN FINAL OUTSIDE LIGHTED TOWERS THAT ARE N OF THE APCH COURSE WHICH ARE AT APPROX 4200 FT MSL. DURING THE APCH, HE SAID THAT HE WOULD DSND TO 4000 FT MSL AND THEN INITIATED THE DSCNT TO TURN INSIDE OF THE TWRS. BIL TWR ASKED IF WE HAD THE TOWERS TO OUR R, TO WHICH I REPLIED AFFIRMATIVE AND WE WERE TURNING INSIDE OF THEM. THE CAPT APPARENTLY HAD MISTAKEN OUR POS AND SEEMED CONFUSED AS THE GPWS STATED TERRAIN AND THE RADAR ALTIMETER READ APPROX +/-1200 FT. I WAS UNAWARE OF HIS CONFUSION AS I WAS BUSY CONFIGURING THE ACFT AND PREPARING TO RUN THE CHKLIST. AT APPROX THE SAME TIME THAT I BECAME AWARE OF THE CAPT'S CONFUSION, THE TWR CTLR ADVISED US THAT THE ARPT ELEVATION WAS 3649 FT MSL. AN IMMEDIATE CLB WAS INITIATED TO APPROX 4600 FT MSL AND THE TWR ASKED US IF WE INTENDED TO OVERFLY THE ARPT AND ENTER THE R DOWNWIND. THE CAPT, WITH MY HELP, AGAIN FOUND THE ARPT AND ACCOMPLISHED THE OVERFLY AND PATTERN ENTRY AND WAS COACHED TO A SAFE LNDG.
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.