Eclipse 550 captain reported autopilot disengage issues during final approach.

Attributes
ACN	1617896
Time
Date	201902
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Make Model Name	Eclipse 500
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Flight Plan	IFR
Component
Aircraft Component	Autopilot
Person 1
Function	Pilot Flying Single Pilot Captain
Qualification	Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Instructor Flight Crew Instrument
Experience	Flight Crew Last 90 Days 50 Flight Crew Total 6500 Flight Crew Type 1100
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

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.

Original NASA ASRS Text

Title: Eclipse 550 Captain reported autopilot disengage issues during final approach.

Narrative: 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.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.