Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Confusion; Troubleshooting; Situational Awareness
Aircraft Equipment Problem Less Severe; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Unstabilized Approach
Air Traffic Control Issued Advisory / Alert; Flight Crew Returned To Clearance; Flight Crew Became Reoriented
Aircraft; Company Policy; Human Factors
At the time of the event; the FO (First Officer) was the pilot flying; we were cleared for the ILS approach; were on localizer; and were descending to 2400. Right before the FAF (Final Approach Fix); we both heard a 'pop.' The FO's attitude indicator was flagged; as was the pilot's attitude indicator. At first; we thought circuit breakers had popped; so we looked and saw none popped. A second later; we saw L AC BUS and R AC BUS illuminated; so that meant Inverter #1 had failed. The Captain took control of the aircraft; and we switched to the #2 Inverter. The attitude indicator indicated 'GYRO COMPUTER' for 5-10 seconds before those flags went away; and unfortunately; I drifted off of localizer and got to 3/4 deflection. As I was correcting; Tower called to inform us we were off course. I told them we had an inverter failure; switched to our 2nd inverter; and were correcting. They asked if we wanted vectors; and I said; 'I'm on localizer now; is that what you're showing?' She confirmed I was on localizer. We then landed.It was a system failure which caused me to drift off localizer. In the future; I will ask for vectors and go around. As for the plane; in my opinion; the root cause has not been identified; because this is the fourth Inverter #1 failure in about a month.
SA227 Captain reported an inverter failure on final approach causing them to deviate from the localizer on the ILS.