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A pilot and center controller reported a communication problem with an altitude clearance and descended below the minimum IFR altitude.
| Attributes | |
| ACN | 1488926 |
| Time | |
| Date | 201710 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | JAC.Airport |
| State Reference | WY |
| Aircraft 1 | |
| Make Model Name | Light Transport |
| Operating Under FAR Part | Part 135 |
| Flight Phase | Descent |
| Route In Use | Direct |
| Flight Plan | IFR |
| Person 1 | |
| Function | Enroute |
| Qualification | Air Traffic Control Developmental |
| Person 2 | |
| Function | Single Pilot Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine |
| Experience | Flight Crew Last 90 Days 50 Flight Crew Total 32000 Flight Crew Type 250 |
| Events | |
| Anomaly | ATC Issue All Types Inflight Event / Encounter CFTT / CFIT |
Narrative:
I was the radar controller of the combined sectors. Aircraft X was on a heading at 16;000 feet. I issued a descent to 14;000 feet; the minimum IFR altitude (mia) in his area at the time was 13;700 feet. I thought the read back was correct; however after listening to it; it was very unclear. I noticed the pilot start to descend through 14;000 feet; to 13;700 feet where I asked; 'say altitude'. The pilot came back saying his altitude was 13;500 feet at the time; and descending to 11;000 feet. I issued a low altitude alert and a climb above the mia.I recommend new radios; or a new radio system.
Original NASA ASRS Text
Title: A pilot and Center Controller reported a communication problem with an altitude clearance and descended below the minimum IFR altitude.
Narrative: I was the Radar Controller of the combined sectors. Aircraft X was on a heading at 16;000 feet. I issued a descent to 14;000 feet; the Minimum IFR Altitude (MIA) in his area at the time was 13;700 feet. I thought the read back was correct; however after listening to it; it was very unclear. I noticed the pilot start to descend through 14;000 feet; to 13;700 feet where I asked; 'say altitude'. The pilot came back saying his altitude was 13;500 feet at the time; and descending to 11;000 feet. I issued a low altitude alert and a climb above the MIA.I recommend new radios; or a new radio system.
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.