BE20 pilot reported overshooting a cleared altitude and overflying a towered airport at 1;000 feet.

Attributes
ACN	1556601
Time
Date	201806
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	Super King Air 200
Operating Under FAR Part	Part 91
Flight Phase	Initial Approach
Flight Plan	IFR
Component
Aircraft Component	Autopilot
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Flight Instructor
Experience	Flight Crew Last 90 Days 125 Flight Crew Total 16340 Flight Crew Type 6000
Events
Anomaly	Airspace Violation All Types Deviation - Altitude Overshoot Deviation - Procedural Clearance Deviation - Procedural FAR Flight Deck / Cabin / Aircraft Event Other / Unknown Inflight Event / Encounter CFTT / CFIT

Narrative:

While being vectored for the RNAV [approach]; I was given the clearance to cross zzzzz at or above 2;000 feet; cleared for the approach. I was at 2;800 feet MSL. I set 2;000 feet and selected altitude select I was busy getting the airplane configured for landing when I realized that the altitude had not captured and arrested the descent and passed over ZZZ airfield at 1;000 feet. I then made a successful landing at ZZZ1.

Original NASA ASRS Text

Title: BE20 pilot reported overshooting a cleared altitude and overflying a towered airport at 1;000 feet.

Narrative: While being vectored for the RNAV [approach]; I was given the clearance to cross ZZZZZ at or above 2;000 feet; cleared for the approach. I was at 2;800 feet MSL. I set 2;000 feet and selected altitude select I was busy getting the airplane configured for landing when I realized that the altitude had not captured and arrested the descent and passed over ZZZ airfield at 1;000 feet. I then made a successful landing at ZZZ1.

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.