Pilot of a piper comanche, PA24, descended below assigned intermediate approach transition altitude due to turbulence resulting in exiting class B airspace.

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Attributes
ACN	477360
Time
Date	200006
Day	Tue
Local Time Of Day	0601 To 1200
Place
State Reference	MN
Altitude	msl bound lower : 3700 msl bound upper : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	PA-24 Comanche
Operating Under FAR Part	Part 91
Flight Phase	descent : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : multi engine pilot : cfi
Experience	flight time last 90 days : 50 flight time total : 2400 flight time type : 15
ASRS Report	477360
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	airspace violation : exit inflight encounter : turbulence non adherence : clearance non adherence : far other anomaly
Independent Detector	other controllera other flight crewa
Resolutory Action	controller : issued alert flight crew : returned to assigned altitude
Consequence	faa : assigned or threatened penalties faa : investigated
Supplementary
Problem Areas	Flight Crew Human Performance Weather
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were cleared down to 4000 ft MSL by ATC. Some turbulence and downdrafts encountered, resulting in 300 ft deviation lower than cleared. No conflict with other aircraft involved. Discussed this with ATC upon landing. Remedies: stay on top of the situation closer in turbulence.

Original NASA ASRS Text

Title: PLT OF A PIPER COMANCHE, PA24, DSNDED BELOW ASSIGNED INTERMEDIATE APCH TRANSITION ALT DUE TO TURB RESULTING IN EXITING CLASS B AIRSPACE.

Narrative: WE WERE CLRED DOWN TO 4000 FT MSL BY ATC. SOME TURB AND DOWNDRAFTS ENCOUNTERED, RESULTING IN 300 FT DEV LOWER THAN CLRED. NO CONFLICT WITH OTHER ACFT INVOLVED. DISCUSSED THIS WITH ATC UPON LNDG. REMEDIES: STAY ON TOP OF THE SIT CLOSER IN TURB.

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.