Queen Air 65/70 (Seminole)
Flight Crew Commercial; Flight Crew Multiengine; Flight Crew Instrument
Deviation - Altitude Excursion From Assigned Altitude; Deviation / Discrepancy - Procedural Clearance; Inflight Event / Encounter Weather / Turbulence
General None Reported / Taken
Weather
Encountered severe ice and could not exit the conditions before losing ability to maintain altitude. Continued on with the approach to landing starting the approach 400 feet low.
BE-65 pilot reported difficulty maintaining altitude on approach after encountering severe icing conditions.