C177 at a non-towered airport departs runway while traffic was utilizing the opposite runway.

Attributes
ACN	804806
Time
Date	200809
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : sfo.airport
State Reference	CA
Altitude	msl single value : 830
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : bmi.tower
Operator	general aviation : personal
Make Model Name	Cardinal 177/177RG
Operating Under FAR Part	Part 91
Flight Phase	climbout : takeoff ground : takeoff roll
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	descent : approach
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : private pilot : instrument
Experience	flight time last 90 days : 50 flight time total : 2500 flight time type : 500
ASRS Report	804806
Events
Anomaly	conflict : ground critical other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Miss Distance	vertical : 100
Supplementary
Problem Areas	Airport Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

I had gotten clearance from departure. Looked down runway announced on 123.0 'taking off' and began our takeoff roll when my passenger saw another plane enter the opposite end of the runway. We expedited our climb out and cleared other aircraft by about 100 ft.

Original NASA ASRS Text

Title: C177 AT A NON-TOWERED ARPT DEPARTS RWY WHILE TRAFFIC WAS UTILIZING THE OPPOSITE RWY.

Narrative: I HAD GOTTEN CLRNC FROM DEP. LOOKED DOWN RWY ANNOUNCED ON 123.0 'TAKING OFF' AND BEGAN OUR TKOF ROLL WHEN MY PAX SAW ANOTHER PLANE ENTER THE OPPOSITE END OF THE RWY. WE EXPEDITED OUR CLBOUT AND CLRED OTHER ACFT BY ABOUT 100 FT.

Data retrieved from NASA's ASRS site as of May 2009 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.