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Approach controller report regarding issuance of a descent clearance in which pilot read back 3000 ft not the assigned 6000 ft and controller did not catch the error. Low altitude alert activated.
| Attributes | |
| ACN | 393235 |
| Time | |
| Date | 199801 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : oak |
| State Reference | CA |
| Altitude | msl bound lower : 4700 msl bound upper : 6000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : oak |
| Make Model Name | M-20 E Super 21 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent other |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller radar : 20 flight time total : 200 |
| ASRS Report | 393235 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : private pilot : instrument |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Supplementary | |
| Air Traffic Incident | other |
Narrative:
IFR MO21 issued descent to 6000 ft. Pilot read back 3000 ft and start down. Controller issue 6000 ft again when MO21 is leaving 5700 ft but does not give MO21 time to acknowledge. Low altitude alert at 4700 ft. MO21 told to climb immediately to 6000 ft and he does, saying he was assigned 3000 ft.
Original NASA ASRS Text
Title: APCH CTLR RPT REGARDING ISSUANCE OF A DSCNT CLRNC IN WHICH PLT READ BACK 3000 FT NOT THE ASSIGNED 6000 FT AND CTLR DID NOT CATCH THE ERROR. LOW ALT ALERT ACTIVATED.
Narrative: IFR MO21 ISSUED DSCNT TO 6000 FT. PLT READ BACK 3000 FT AND START DOWN. CTLR ISSUE 6000 FT AGAIN WHEN MO21 IS LEAVING 5700 FT BUT DOES NOT GIVE MO21 TIME TO ACKNOWLEDGE. LOW ALT ALERT AT 4700 FT. MO21 TOLD TO CLB IMMEDIATELY TO 6000 FT AND HE DOES, SAYING HE WAS ASSIGNED 3000 FT.
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.