Small transport return land after getting door warning light and door opening in flight.

Attributes
ACN	184692
Time
Date	199107
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : bgm
State Reference	NY
Altitude	msl bound lower : 0 msl bound upper : 2500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : bgm
Operator	general aviation : instructional
Make Model Name	Small Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : takeoff climbout : initial
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi pilot : instrument
Experience	flight time last 90 days : 70 flight time total : 11000 flight time type : 4700
ASRS Report	184692
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation other

Narrative:

During takeoff roll, after 80 KTS but before V1 a door unlock light came on. I elected to continue the takeoff and return to check the doors because I was passing V1 by the time the warning light was fully on. I cleared up the aircraft, kept the speed down and reduced pressurization to 0. This light is triggered by one of 4 switches on the aircraft but only 1 is a cabin door. I asked the copilot to go back and check the cabin door and inform the passengers we would be landing to check the light. He informed the passengers then started to move the door handle to be sure it was locked. The door opened with some air noise. He then closed the door and everything checked green. We landed and rechked the door and seal. Everything was ok so we departed.

Original NASA ASRS Text

Title: SMT RETURN LAND AFTER GETTING DOOR WARNING LIGHT AND DOOR OPENING IN FLT.

Narrative: DURING TKOF ROLL, AFTER 80 KTS BUT BEFORE V1 A DOOR UNLOCK LIGHT CAME ON. I ELECTED TO CONTINUE THE TKOF AND RETURN TO CHK THE DOORS BECAUSE I WAS PASSING V1 BY THE TIME THE WARNING LIGHT WAS FULLY ON. I CLRED UP THE ACFT, KEPT THE SPD DOWN AND REDUCED PRESSURIZATION TO 0. THIS LIGHT IS TRIGGERED BY ONE OF 4 SWITCHES ON THE ACFT BUT ONLY 1 IS A CABIN DOOR. I ASKED THE COPLT TO GO BACK AND CHK THE CABIN DOOR AND INFORM THE PAXS WE WOULD BE LNDG TO CHK THE LIGHT. HE INFORMED THE PAXS THEN STARTED TO MOVE THE DOOR HANDLE TO BE SURE IT WAS LOCKED. THE DOOR OPENED WITH SOME AIR NOISE. HE THEN CLOSED THE DOOR AND EVERYTHING CHKED GREEN. WE LANDED AND RECHKED THE DOOR AND SEAL. EVERYTHING WAS OK SO WE DEPARTED.

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.