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Two ZSE controllers reported issuing a pilot the lowest mia available; at pilot's request. The pilot later questioned assigned altitude while descending below the mia; causing a lower altitude alert.
| Attributes | |
| ACN | 1512163 |
| Time | |
| Date | 201801 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZSE.ARTCC |
| State Reference | WA |
| Aircraft 1 | |
| Make Model Name | PC-12 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | Descent |
| Flight Plan | IFR |
| Person 1 | |
| Function | Enroute |
| Qualification | Air Traffic Control Fully Certified |
| Person 2 | |
| Function | Enroute |
| Qualification | Air Traffic Control Fully Certified |
| Events | |
| Anomaly | ATC Issue All Types Airspace Violation All Types Deviation - Altitude Overshoot Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Inflight Event / Encounter CFTT / CFIT |
Narrative:
[Aircraft] requesting lowest available altitude. Cleared to mia of 6600 msl. Aircraft read back 6600. Aircraft then asks if the altitude was 6300 or 6600. Clarified to aircraft that the clearance was to 6600. Aircraft descends below mia to 6300 mode-c reported before correcting to 6600. The moment the altitude was questioned; a low altitude alert should have been issued for safety.
Original NASA ASRS Text
Title: Two ZSE Controllers reported issuing a pilot the lowest MIA available; at pilot's request. The pilot later questioned assigned altitude while descending below the MIA; causing a lower altitude alert.
Narrative: [Aircraft] requesting lowest available altitude. Cleared to MIA of 6600 msl. Aircraft read back 6600. Aircraft then asks if the altitude was 6300 or 6600. Clarified to aircraft that the clearance was to 6600. Aircraft descends below MIA to 6300 mode-c reported before correcting to 6600. The moment the altitude was questioned; a Low altitude alert should have been issued for safety.
Data retrieved from NASA's ASRS site 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.