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TRACON instructor reported a developmental issued an altitude below the MVA; and the aircraft descended rapidly below the MVA.
| Attributes | |
| ACN | 1614556 |
| Time | |
| Date | 201902 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | NCT.TRACON |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | Commercial Fixed Wing |
| Flight Phase | Initial Approach |
| Flight Plan | IFR |
| Person 1 | |
| Function | Approach Instructor |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 3.5 |
| Events | |
| Anomaly | ATC Issue All Types Deviation - Altitude Excursion From Assigned Altitude Deviation - Altitude Overshoot Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Inflight Event / Encounter CFTT / CFIT |
Narrative:
Aircraft X was on the silcn 4 arrival landing runway 12R. He was instructed; 'after edmnd maintain 030.' after aircraft X reached that fix he started to descend rapidly. The developmental; without observing the rapid descent told the aircraft to descend to 020. The aircraft was at the 040 ft MVA when he issued this instruction. I told the developmental to tell aircraft X to maintain 030. The aircraft was at 032 when he was instructed to maintain 030 but he continued descending to 023 before he climbed back up again. This was an unusually fast descent. The aircraft hit the 030 ft MVA at 023. I'm going to override his transmissions whenever he does or says something that I don't like instead of telling him to fix it. I'm also going to ask for a training team meeting whenever I see my supervisor and discuss possibly set (special enhanced training) training for mvas.
Original NASA ASRS Text
Title: TRACON Instructor reported a developmental issued an altitude below the MVA; and the aircraft descended rapidly below the MVA.
Narrative: Aircraft X was on the SILCN 4 arrival landing RWY 12R. He was instructed; 'After EDMND maintain 030.' After Aircraft X reached that fix he started to descend rapidly. The developmental; without observing the rapid descent told the aircraft to descend to 020. The aircraft was at the 040 ft MVA when he issued this instruction. I told the developmental to tell Aircraft X to maintain 030. The aircraft was at 032 when he was instructed to maintain 030 but he continued descending to 023 before he climbed back up again. This was an unusually fast descent. The aircraft hit the 030 ft MVA at 023. I'm going to override his transmissions whenever he does or says something that I don't like instead of telling him to fix it. I'm also going to ask for a training team meeting whenever I see my supervisor and discuss possibly SET (Special Enhanced Training) training for MVAs.
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.