A home built pilot taxis into position at cxp to hear and see another light aircraft going around at...

Narrative:

I taxied out in front of a landing aircraft at an uncontrolled airport. While I was about to start my takeoff roll; I saw him fly over me. As I was taxiing out onto the runway; I heard an aircraft with a very poor radio say something nearly unintelligible; but which I thought was an intention to wait to cross the active runway. I checked final and didn't see anyone; but did see someone on a taxiway about half way down the runway that appeared to be holding. As I added power; I heard the same aircraft say something; to which I replied that he had a bad radio and was unintelligible. As I began my roll I then heard what might have been a response but was the sound of two radios stepping on each other. I then stated 'you were stepped on'; and at that time I saw an airplane pass over me; slightly to the right of the runway about two hundred feet above me. It appeared to be an experimental aircraft; maybe a thorp; which I had observed earlier doing touch and go's. What caught my attention then was the pattern this person was flying. At cxp there is a noise abatement procedure which involves flying an extended downwind before turning base; but this aircraft seemed to be flying a very short and close in base to final. In retrospect; this explains why I didn't see him when I checked for traffic on final. Usually if I hear traffic on the unicom; I turn a 360 in the run up area before taking the runway. I think because this aircraft's transmissions were so weak and garbled I assumed that either it was a plane with a bad radio holding for me; or was an aircraft talking to a distant airport pattern and I didn't do the 360 scan I would normally. From now on if I have even a hint that there is someone else in the pattern; I will do my 360.

Original NASA ASRS Text

Title: A home built pilot taxis into position at CXP to hear and see another light aircraft going around at low altitude. A garbled radio transmission had been heard prior to taking the runway but no traffic was visible on final.

Narrative: I taxied out in front of a landing aircraft at an uncontrolled airport. While I was about to start my takeoff roll; I saw him fly over me. As I was taxiing out onto the runway; I heard an aircraft with a very poor radio say something nearly unintelligible; but which I thought was an intention to wait to cross the active runway. I checked final and didn't see anyone; but did see someone on a taxiway about half way down the runway that appeared to be holding. As I added power; I heard the same aircraft say something; to which I replied that he had a bad radio and was unintelligible. As I began my roll I then heard what might have been a response but was the sound of two radios stepping on each other. I then stated 'you were stepped on'; and at that time I saw an airplane pass over me; slightly to the right of the runway about two hundred feet above me. It appeared to be an experimental aircraft; maybe a Thorp; which I had observed earlier doing touch and go's. What caught my attention then was the pattern this person was flying. At CXP there is a noise abatement procedure which involves flying an extended downwind before turning base; but this aircraft seemed to be flying a very short and close in base to final. In retrospect; this explains why I didn't see him when I checked for traffic on final. Usually if I hear traffic on the Unicom; I turn a 360 in the run up area before taking the runway. I think because this aircraft's transmissions were so weak and garbled I assumed that either it was a plane with a bad radio holding for me; or was an aircraft talking to a distant airport pattern and I didn't do the 360 scan I would normally. From now on if I have even a hint that there is someone else in the pattern; I will do my 360.

Data retrieved from NASA's ASRS site as of April 2012 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.

Attributes
ACN	955101
Time
Date	201106
Local Time Of Day	0601-1200
Place
Locale Reference	CXP.Airport
State Reference	NV
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Experimental
Operating Under FAR Part	Part 91
Flight Phase	Takeoff
Route In Use	None
Flight Plan	None
Aircraft 2
Make Model Name	Experimental
Operating Under FAR Part	Part 91
Flight Phase	Landing
Flight Plan	None
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Multiengine Flight Crew Flight Engineer Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 30 Flight Crew Total 13500 Flight Crew Type 250
Events
Anomaly	Conflict Ground Conflict Less Severe Ground Incursion Runway
Miss Distance	Horizontal 50 Vertical 200

A home built pilot taxis into position at cxp to hear and see another light aircraft going around at low altitude. A garbled radio transmission had been heard prior to taking the runway but no traffic was visible on final.