Eclipse 500
Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Flight Instructor; Flight Crew Instrument
Flight Crew Last 90 Days 50; Flight Crew Total 6500; Flight Crew Type 1100
Aircraft Equipment Problem Critical
Flight Crew Overcame Equipment Problem
Aircraft
This event occurred on final approach as I was beginning to transition from IMC to visual conditions on the ILS Runway XX at ZZZ. The ILS was flown with the autopilot engaged until approximately 1;500 AGL. At approximately 1;500 AGL; I pressed the autopilot disconnect button; (gray button on the control stick). I noticed the autopilot did not disconnect and I could feel the clutch was still engaged. I paused for a moment and quickly moved to press the 'ALL INTERRUPT' (red button). The 'ALL INTERRUPT' button also disengaged the Flight Director which made it difficult to maintain the ILS glideslope and localizer course. At the moment of the failure; I had intermittent Ground contact and after a rough and wobbly transition; I was able to make appropriate corrections; complete the approach; and land safely.
Eclipse 550 Captain reported autopilot disengage issues during final approach.