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Unintentionally assigning an altitude below mia to an aircraft being vectored for an approach by a zan controller resulted in an MSAW alarm event.
| Attributes | |
| ACN | 969758 |
| Time | |
| Date | 201109 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZAN.ARTCC |
| State Reference | AK |
| Aircraft 1 | |
| Make Model Name | Citationjet (C525/C526) - CJ I / II / III / IV |
| Flight Phase | Descent |
| Route In Use | Vectors |
| Flight Plan | IFR |
| Person 1 | |
| Function | Enroute |
| Qualification | Air Traffic Control Fully Certified |
| Events | |
| Anomaly | ATC Issue All Types Airspace Violation All Types Deviation - Procedural Published Material / Policy Inflight Event / Encounter CFTT / CFIT |
Narrative:
A C525 was enroute to vdz; level at 150; assigned radar vector 090 to join the vdz localizer and proceed inbound. Another aircraft; whose call sign I cannot remember; had just departed vdz climbing to 100 non-radar. Reference the outbound traffic; I issued a descent clearance to the C252; pilot's discretion to 110; overlooking an mia of 128 between that aircraft and the airport. The MSAW alarmed and I realized what had happened. When I called the aircraft to stop the descent; he would not respond. I called three or four times and observed the aircraft level at 110 in a 128 mia area. The C525 then called me on another frequency looking for lower. At this point the aircraft was entering a 090 mia so I didn't issue a climb.
Original NASA ASRS Text
Title: Unintentionally assigning an altitude below MIA to an aircraft being vectored for an approach by a ZAN Controller resulted in an MSAW alarm event.
Narrative: A C525 was enroute to VDZ; level at 150; assigned RADAR vector 090 to join the VDZ localizer and proceed inbound. Another aircraft; whose call sign I cannot remember; had just departed VDZ climbing to 100 non-RADAR. Reference the outbound traffic; I issued a descent clearance to the C252; pilot's discretion to 110; overlooking an MIA of 128 between that aircraft and the airport. The MSAW alarmed and I realized what had happened. When I called the aircraft to stop the descent; he would not respond. I called three or four times and observed the aircraft level at 110 in a 128 MIA area. The C525 then called me on another frequency looking for lower. At this point the aircraft was entering a 090 MIA so I didn't issue a climb.
Data retrieved from NASA's ASRS site as of April 2012 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.