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A controller working the radar assist position and their trainee reported the radar controller allowed an aircraft to descend below the minimum IFR altitude even though they advised him of the mia.
| Attributes | |
| ACN | 1507275 |
| Time | |
| Date | 201712 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZSE.ARTCC |
| State Reference | WA |
| Aircraft 1 | |
| Make Model Name | Citationjet (C525/C526) - CJ I / II / III / IV |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Final Approach |
| Route In Use | Other Instrument Approach |
| Flight Plan | IFR |
| Person 1 | |
| Function | Enroute |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 4 |
| Person 2 | |
| Function | Enroute |
| Qualification | Air Traffic Control Developmental |
| Events | |
| Anomaly | ATC Issue All Types Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Inflight Event / Encounter CFTT / CFIT |
Narrative:
The citation jet was pointed out with approach and cleared for the RNAV approach direct [fix] at 4000 feet. I told the radar controller at least 2 times that the mia (minimum IFR altitude) was 4200 feet prior to the aircraft reaching the fix. The radar controller didn't amend the clearance and it appeared the aircraft was at 4000 feet prior to [fix] and below the mia of 4200 feet. The scale of the map at quick glance could have appeared to the radar controller that [fix] was in a 4000 foot mia and that's why they took no action.
Original NASA ASRS Text
Title: A Controller working the Radar Assist position and their trainee reported the Radar Controller allowed an aircraft to descend below the Minimum IFR Altitude even though they advised him of the MIA.
Narrative: The Citation jet was pointed out with Approach and cleared for the RNAV approach direct [fix] at 4000 feet. I told the Radar Controller at least 2 times that the MIA (Minimum IFR Altitude) was 4200 feet prior to the aircraft reaching the fix. The Radar Controller didn't amend the clearance and it appeared the aircraft was at 4000 feet prior to [fix] and below the MIA of 4200 feet. The scale of the map at quick glance could have appeared to the Radar Controller that [fix] was in a 4000 foot MIA and that's why they took no action.
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.