At approximately 4000' MSL in climb, right-hand door of small transport opened. Pilot lost control of aircraft. During recovery the door departed the aircraft. Pilot recovered control and returned to land at departure airport, abi.

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Attributes
ACN	162555
Time
Date	199011
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : abi
State Reference	TX
Altitude	msl bound lower : 2500 msl bound upper : 4000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : abi tower : bos
Operator	general aviation : personal
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	climbout : initial cruise other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 30 flight time total : 1200 flight time type : 200
ASRS Report	162555
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other other : unspecified cockpit
Resolutory Action	flight crew : regained aircraft control other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

I departed abi on an IFR to ft scott, ks. Upon reaching 4000' the aircraft rolled right and left and the artificial horizon spun. Upon recovering the aircraft the right-hand door came off in an unusual attitude. The airspeed reached 190 mph and rate of descent 3000-4000 FPM. I recovered the aircraft level above 2500' and returned to the airport. No injuries or other problems. The aircraft was an small transport. Upon departure I am sure the handle was down, but I don't believe the lock pins were engaged.

Original NASA ASRS Text

Title: AT APPROX 4000' MSL IN CLIMB, RIGHT-HAND DOOR OF SMT OPENED. PLT LOST CTL OF ACFT. DURING RECOVERY THE DOOR DEPARTED THE ACFT. PLT RECOVERED CTL AND RETURNED TO LAND AT DEP ARPT, ABI.

Narrative: I DEPARTED ABI ON AN IFR TO FT SCOTT, KS. UPON REACHING 4000' THE ACFT ROLLED RIGHT AND LEFT AND THE ARTIFICIAL HORIZON SPUN. UPON RECOVERING THE ACFT THE RIGHT-HAND DOOR CAME OFF IN AN UNUSUAL ATTITUDE. THE AIRSPD REACHED 190 MPH AND RATE OF DSNT 3000-4000 FPM. I RECOVERED THE ACFT LEVEL ABOVE 2500' AND RETURNED TO THE ARPT. NO INJURIES OR OTHER PROBS. THE ACFT WAS AN SMT. UPON DEP I AM SURE THE HANDLE WAS DOWN, BUT I DON'T BELIEVE THE LOCK PINS WERE ENGAGED.

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.