A PA27 pilot departed assigned heading and altitude while on an IFR clearance into bjc.

Attributes
ACN	438690
Time
Date	199905
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : bjc.airport
State Reference	CO
Altitude	msl single value : 8000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : d01.tracon tower : jfk.tower
Operator	general aviation : personal
Make Model Name	Piper Single Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Route In Use	arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : commercial pilot : multi engine
Experience	flight time last 90 days : 50 flight time total : 1800 flight time type : 1400
ASRS Report	438690
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was on IFR flight plan. Approach control told me to fly a certain heading (120 degrees) and 8000 ft and report bjc in sight. When I saw bjc I descended to 7500 ft and turned toward bjc, thereby busting my clearance.

Original NASA ASRS Text

Title: A PA27 PLT DEPARTED ASSIGNED HEADING AND ALT WHILE ON AN IFR CLRNC INTO BJC.

Narrative: I WAS ON IFR FLT PLAN. APCH CTL TOLD ME TO FLY A CERTAIN HDG (120 DEGS) AND 8000 FT AND RPT BJC IN SIGHT. WHEN I SAW BJC I DSNDED TO 7500 FT AND TURNED TOWARD BJC, THEREBY BUSTING MY CLRNC.

Data retrieved from NASA's ASRS site as of July 2007 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.