CE525 flight crew reported descending below minimums on an ILS approach.

Attributes
ACN	1667095
Time
Date	201907
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Make Model Name	Citationjet (C525/C526) - CJ I / II / III / IV
Operating Under FAR Part	Part 135
Flight Phase	Final Approach
Flight Plan	IFR
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Commercial Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Total 8000
Events
Anomaly	Deviation - Procedural FAR Deviation - Procedural Published Material / Policy Inflight Event / Encounter CFTT / CFIT Inflight Event / Encounter Weather / Turbulence

Narrative:

We were vectored for the ILS xx at ZZZ; upon crossing the VOR we flew the full approach. Visibility was 4 miles overcast 200 ft. The overcast had previously been 300 ft. Then dropped to 200 ft.; the da (decision altitude) was 250 ft. We decided to fly the approach since the visibility was 4 miles. When reaching the da of 250 ft. My copilot called runway in sight; I continued the descent for about five more seconds but I did not have contact with the runway ; just as I was pressing the go around button the runway came into full view. The 200 ft. Overcast report was correct as far as I'm concerned. We were still in position to land so I continued the landing. After words I realized we were below the da when I saw the runway and should have gone around. Hence this report.

Original NASA ASRS Text

Title: CE525 flight crew reported descending below minimums on an ILS approach.

Narrative: We were vectored for the ILS XX at ZZZ; upon crossing the VOR we flew the full approach. Visibility was 4 Miles overcast 200 ft. The overcast had previously been 300 ft. then dropped to 200 ft.; the DA (Decision Altitude) was 250 ft. We decided to fly the approach since the visibility was 4 miles. When reaching the DA of 250 ft. my copilot called runway in sight; I continued the descent for about five more seconds but I did not have contact with the runway ; just as I was pressing the go around button the runway came into full view. The 200 ft. overcast report was correct as far as I'm concerned. We were still in position to land so I continued the landing. After words I realized we were below the DA when I saw the runway and should have gone around. Hence this report.

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.