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Boi TRACON controller reported a missed read back which almost led to an aircraft descending below the minimum vectoring altitude.
| Attributes | |
| ACN | 1470162 |
| Time | |
| Date | 201708 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | BOI.Airport |
| State Reference | ID |
| Aircraft 1 | |
| Make Model Name | EMB ERJ 170/175 ER/LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Route In Use | Vectors |
| Flight Plan | IFR |
| Person 1 | |
| Function | Approach Instructor |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 5 |
| Events | |
| Anomaly | ATC Issue All Types Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Inflight Event / Encounter CFTT / CFIT |
Narrative:
One runway operation due to construction. Training new controller on north radar combined up with south radar. We were talking about sequencing and spacing for general aviation aircraft following a B737 from the south. Aircraft X was put on a vector heading 260 to maintain 9000 for spacing with the multiple GA aircraft inbound from the north. Aircraft X read back 260 down to 6000 and both trainee and I missed the read back. We then went back to talking about the spacing needed for the previous arrivals. We both noticed the altitude when he was descending through 6500 in a 6500 MVA and told him to climb. I totally missed the read back.don't assume the pilots are going to read the headings and altitudes back correctly. I think the 260 heading kind of jostled the pilots mind so that is where he got 6000 for his final altitude he read back to us. Complacency is not a good attribute in this career. No harm happened thankfully but it was a wakeup call for me to be more vigilant in getting correct read backs.
Original NASA ASRS Text
Title: BOI TRACON Controller reported a missed read back which almost led to an aircraft descending below the Minimum Vectoring Altitude.
Narrative: One runway operation due to construction. Training new controller on north radar combined up with south radar. We were talking about sequencing and spacing for general aviation aircraft following a B737 from the south. Aircraft X was put on a vector heading 260 to maintain 9000 for spacing with the multiple GA aircraft inbound from the north. Aircraft X read back 260 down to 6000 and both trainee and I missed the read back. We then went back to talking about the spacing needed for the previous arrivals. We both noticed the altitude when he was descending through 6500 in a 6500 MVA and told him to climb. I totally missed the read back.Don't assume the pilots are going to read the headings and altitudes back correctly. I think the 260 heading kind of jostled the pilots mind so that is where he got 6000 for his final altitude he read back to us. Complacency is not a good attribute in this career. No harm happened thankfully but it was a wakeup call for me to be more vigilant in getting correct read backs.
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.