RV9A discovered obstruction on runway during takeoff on uncontrolled airport. Takeoff was continued;...

Attributes
ACN	754738
Time
Date	200709
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Experimental
Operating Under FAR Part	Part 91
Flight Phase	ground : takeoff roll
Flight Plan	None
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : private
Experience	flight time last 90 days : 78 flight time total : 1750 flight time type : 350
ASRS Report	754738
Events
Anomaly	conflict : ground less severe incursion : runway
Independent Detector	other flight crewa
Resolutory Action	flight crew : exited adverse environment flight crew : took precautionary avoidance action
Supplementary
Problem Areas	Flight Crew Human Performance Airport
Primary Problem	Ambiguous

Narrative:

My preflight briefing stated that the east taxiway was closed; no reason given. After run-up; I was ready to depart runway xx; the calm wind runway that is about 5100 ft long. A light twin had just landed on xy. There was some activity on the south half of the east taxiway; too far away to identify and of no obvious interest since I knew the east taxiway was closed. The runway was clear and I announced my departure and my intended turn to the north. During the takeoff roll; I discovered that vehicles (or a disabled aircraft) had moved onto the runway; apparently to cross to the west side of the field. Since I could lift off several thousand ft before the obstruction and clear it by several hundred; I considered a takeoff safer than a high speed abort and continued my takeoff. No announcement of any kind had been made on the CTAF. It is certain that my radio was working properly since I listened to the ASOS before switching frequencys and I confirmed the correct frequency and was set immediately after takeoff. The runway was clear when I taxied into position and it identification difficult to see what I could have done other than continue or abort. A short but clear announcement by the obstructing party would have been helpful.

Original NASA ASRS Text

Title: RV9A DISCOVERED OBSTRUCTION ON RWY DURING TKOF ON UNCONTROLLED ARPT. TKOF WAS CONTINUED; OVERFLYING OBSTRUCTION.

Narrative: MY PREFLT BRIEFING STATED THAT THE E TXWY WAS CLOSED; NO REASON GIVEN. AFTER RUN-UP; I WAS READY TO DEPART RWY XX; THE CALM WIND RWY THAT IS ABOUT 5100 FT LONG. A LIGHT TWIN HAD JUST LANDED ON XY. THERE WAS SOME ACTIVITY ON THE S HALF OF THE E TXWY; TOO FAR AWAY TO IDENT AND OF NO OBVIOUS INTEREST SINCE I KNEW THE E TXWY WAS CLOSED. THE RWY WAS CLR AND I ANNOUNCED MY DEP AND MY INTENDED TURN TO THE N. DURING THE TKOF ROLL; I DISCOVERED THAT VEHICLES (OR A DISABLED ACFT) HAD MOVED ONTO THE RWY; APPARENTLY TO CROSS TO THE W SIDE OF THE FIELD. SINCE I COULD LIFT OFF SEVERAL THOUSAND FT BEFORE THE OBSTRUCTION AND CLR IT BY SEVERAL HUNDRED; I CONSIDERED A TKOF SAFER THAN A HIGH SPD ABORT AND CONTINUED MY TKOF. NO ANNOUNCEMENT OF ANY KIND HAD BEEN MADE ON THE CTAF. IT IS CERTAIN THAT MY RADIO WAS WORKING PROPERLY SINCE I LISTENED TO THE ASOS BEFORE SWITCHING FREQS AND I CONFIRMED THE CORRECT FREQ AND WAS SET IMMEDIATELY AFTER TKOF. THE RWY WAS CLR WHEN I TAXIED INTO POS AND IT ID DIFFICULT TO SEE WHAT I COULD HAVE DONE OTHER THAN CONTINUE OR ABORT. A SHORT BUT CLR ANNOUNCEMENT BY THE OBSTRUCTING PARTY WOULD HAVE BEEN HELPFUL.

Data retrieved from NASA's ASRS site as of January 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.

RV9A discovered obstruction on runway during takeoff on uncontrolled airport. Takeoff was continued; overflying obstruction.