Small Aircraft; High Wing; 1 Eng; Retractable Gear
Flight Crew Flight Instructor; Flight Crew Instrument
Flight Crew Last 90 Days 250; Flight Crew Total 7000; Flight Crew Type 300
Human-Machine Interface; Situational Awareness; Time Pressure; Troubleshooting
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter CFTT / CFIT
Air Traffic Control Issued New Clearance; Air Traffic Control Provided Assistance; Flight Crew Took Evasive Action
Aircraft; Human Factors
After conducting several prior instrument approaches and on the 2nd approach into the RNM RNAV 9; upon reaching the missed approach point; we activated the missed approach segment. However; the G1000 avionics did not sequence into the missed segment. By the time we were able to troubleshoot the problem; we had flown into lower terrain and were below the MVA. At that point ATC directed us to fly direct to ROBNN; the missed approach waypoint; however; we had already loaded the next approach and the time taken to load ROBNN manually caused us to fly further into lower terrain. ATC then issued a vector to the next approach however we were still somewhat below the MVA for a short period of time before reaching 6;000 feet.This situation was caused by an over reliance on a coupled missed approach and when the airplane did not sequence to the missed approach segment as expected; we should have taken immediate action and just navigated manually without the autopilot. Lesson learned to not wait to troubleshoot but take manual control.
Small aircraft instructor pilot reported the G1000 system malfunctioned during missed approach training resulting in a CFTT event.