Small transport door came open in flight.

Attributes
ACN	171326
Time
Date	199102
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : pwk airport : ikk
State Reference	IL
Altitude	msl bound lower : 8000 msl bound upper : 8000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zau
Operator	general aviation : corporate
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 200 flight time total : 4000 flight time type : 100
ASRS Report	171326
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	none taken : unable
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Departed pwk with no passenger (return trip home). At that time I had no indication that I had a door problem. Upon departure I entered turbulence until passing about 6000'. Cruise was at 8000'. Most of the turbulence was moderate. I think that it played a large roll in the bottom half of the door coming open. I later found that this aircraft has had this problem before. I told ZAU that I had a problem (I did not declare an emergency). Center gave me radar vector to the kankakee airport that I landed. The aircraft was very stable.

Original NASA ASRS Text

Title: SMT DOOR CAME OPEN IN FLT.

Narrative: DEPARTED PWK WITH NO PAX (RETURN TRIP HOME). AT THAT TIME I HAD NO INDICATION THAT I HAD A DOOR PROB. UPON DEP I ENTERED TURB UNTIL PASSING ABOUT 6000'. CRUISE WAS AT 8000'. MOST OF THE TURB WAS MODERATE. I THINK THAT IT PLAYED A LARGE ROLL IN THE BOTTOM HALF OF THE DOOR COMING OPEN. I LATER FOUND THAT THIS ACFT HAS HAD THIS PROB BEFORE. I TOLD ZAU THAT I HAD A PROB (I DID NOT DECLARE AN EMER). CENTER GAVE ME RADAR VECTOR TO THE KANKAKEE ARPT THAT I LANDED. THE ACFT WAS VERY STABLE.

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.