TRACON Controller trainee and air carrier pilot reported due to a miscommunication the air carrier descended below their assigned altitude and flew below the Minimum Vectoring Altitude.
Synopsis
TRACON Controller trainee and air carrier pilot reported due to a miscommunication the air carrier descended below their assigned altitude and flew below the Minimum Vectoring Altitude.
Narrative
Aircraft X (CRJ9) was inbound to ZZZ airport for the visual approach to Runway XX and I issued a descent to 3000 ft.; which was read back by Aircraft X. Simultaneously; Aircraft Y was inbound on the final approach course for the visual approach to Runway XX at ZZZ; with unidentified VFR aircraft maneuvering on the Runway XX final approach course. As I was monitoring Aircraft Y's position on final with regard to the maneuvering VFR aircraft on final; Aircraft X proceeded to descend through his assigned altitude of 3000 ft. to 2000 ft. I issued Aircraft X a low altitude alert. Aircraft X advised he was in the climb to 2500 ft.; and advised if I wanted to issue higher. I then issued Aircraft X 3000 ft. As Aircraft X was vacating 2000 ft. I issued a vector below the MVA; to turn him towards ZZZ airport. That same vector also put Aircraft X toward a minimum vectoring altitude sector of 3000 ft. I had anticipated Aircraft X to have a greater climb rate in order to comply with the MVA and to start his turn above the MVA altitude. In order to protect controllers and aircraft from the Minimum Vectoring Altitude change adjacent to ZZZZZ1; maybe an outline of the area can be made as selectable map.
Second reporter narrative
On the Date at approximately XX15z I was operating as First Officer and Pilot Monitoring flight Aircraft X from ZZZ1 to ZZZ. During our final approach we were given an instruction to descend and maintain 3000 ft. initially then shortly after we were told to descend and maintain 2000 ft. we did so and shortly after we leveled off we were advised by ATC that the MDA in our area is 2500 ft. We advised the Controller that we were given a clearance for 2000 ft. The Approach Controller told us to climb and maintain 3000 ft. we did so and were shortly cleared for the visual approach into the ZZZ airport. We maintained SOP and procedural adherence the entire flight (standard callouts; checks etc). The controller didn't ask or talk about the situation further. We were in VMC conditions with the airport in sight the entire time and visual contact with the ground and obstacles and made sure we maintained clearance from all obstacles. I believe this was just miscommunication between us the pilots and ATC. Also I would like to note that there was intermittent feedback on the frequency.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.