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Low altitude alert issued by ATC when a cpr CE560 descends below the 9600 ft clearance altitude to 9000 ft 20 mi southwest of rap, sd.
| Attributes | |
| ACN | 559876 |
| Time | |
| Date | 200209 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | navaid : rap.vortac |
| State Reference | SD |
| Altitude | msl bound lower : 9000 msl bound upper : 9600 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdv.artcc tracon : rca.tracon |
| Operator | general aviation : corporate |
| Make Model Name | Citation V |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : intermediate altitude descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 4200 flight time type : 35 |
| ASRS Report | 559876 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance other spatial deviation |
| Independent Detector | atc equipment : msaw other controllera |
| Resolutory Action | controller : issued alert flight crew : returned to assigned altitude |
| Supplementary | |
| Problem Areas | Environmental Factor ATC Human Performance Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Approximately 20 mi southwest of our destination of rapid city, sd, at 9000 ft, ATC issued a low altitude alert and instructed us to climb to 9600 ft. I was PNF and had been off frequency when the descent to 9000 ft was issued. Upon my return, the captain informed me that we were descending to 9000 ft. It is unclr to me whether ATC issued a descent to 9600 ft or if the captain read back 9000 ft and was not corrected by ATC. It was a clear day and we maintained visual clearance with the terrain. The GPWS did not activate.
Original NASA ASRS Text
Title: LOW ALT ALERT ISSUED BY ATC WHEN A CPR CE560 DSNDS BELOW THE 9600 FT CLRNC ALT TO 9000 FT 20 MI SW OF RAP, SD.
Narrative: APPROX 20 MI SW OF OUR DEST OF RAPID CITY, SD, AT 9000 FT, ATC ISSUED A LOW ALT ALERT AND INSTRUCTED US TO CLB TO 9600 FT. I WAS PNF AND HAD BEEN OFF FREQ WHEN THE DSCNT TO 9000 FT WAS ISSUED. UPON MY RETURN, THE CAPT INFORMED ME THAT WE WERE DSNDING TO 9000 FT. IT IS UNCLR TO ME WHETHER ATC ISSUED A DSCNT TO 9600 FT OR IF THE CAPT READ BACK 9000 FT AND WAS NOT CORRECTED BY ATC. IT WAS A CLR DAY AND WE MAINTAINED VISUAL CLRNC WITH THE TERRAIN. THE GPWS DID NOT ACTIVATE.
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.