Narrative:

Airplanes were using runway 29 at tracy airport although prevailing wind favored runway 25. I was one of up to 3 airplanes departing on runway 29. One unknown airplane took off on runway 25, unannounced, while I was on short final to runway 29. On my takeoff had to deviate slightly to the right to have adequate clearance with that airplane which crossed runway 29 at about 350'. On my crosswind had to keep an small transport in sight, which was making a straight out departure on 29. Then another aircraft crossed runway 29 at 1000' on a heading of approximately 200 degrees. An small aircraft made a go around on runway 25 when I was on short final again on runway 29. The first radio call it made was to state it was setting up for runway 29 (it crossed runway 29, or course, in so doing). It idented itself as a specific type, never giving its call sigh. All these occurred in a 30 min period. I believe the small aircraft made a straight in approach to runway 25 as I observed all the airplanes in the airport vicinity. At no time were any of us in a hazardous situation from my viewpoint as I was aware of the other airplanes' positions. However, west/O constant vigilance, monitoring the radio looking out of the cockpit, there was a potential for midairs. I would recommend that procedures as uncontrolled field prohibit straight in approachs instead of only recommending that it not be done (including IFR approachs in VFR conditions). For myself, I will practice crosswind takeoff and lndgs at controled fields as much as possible from now.

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Original NASA ASRS Text

Title: MULTIPLE RWY USE AT UNCONTROLLED ARPT.

Narrative: AIRPLANES WERE USING RWY 29 AT TRACY ARPT ALTHOUGH PREVAILING WIND FAVORED RWY 25. I WAS ONE OF UP TO 3 AIRPLANES DEPARTING ON RWY 29. ONE UNKNOWN AIRPLANE TOOK OFF ON RWY 25, UNANNOUNCED, WHILE I WAS ON SHORT FINAL TO RWY 29. ON MY TKOF HAD TO DEVIATE SLIGHTLY TO THE RIGHT TO HAVE ADEQUATE CLRNC WITH THAT AIRPLANE WHICH CROSSED RWY 29 AT ABOUT 350'. ON MY XWIND HAD TO KEEP AN SMT IN SIGHT, WHICH WAS MAKING A STRAIGHT OUT DEP ON 29. THEN ANOTHER ACFT CROSSED RWY 29 AT 1000' ON A HDG OF APPROX 200 DEGS. AN SMA MADE A GAR ON RWY 25 WHEN I WAS ON SHORT FINAL AGAIN ON RWY 29. THE FIRST RADIO CALL IT MADE WAS TO STATE IT WAS SETTING UP FOR RWY 29 (IT CROSSED RWY 29, OR COURSE, IN SO DOING). IT IDENTED ITSELF AS A SPECIFIC TYPE, NEVER GIVING ITS CALL SIGH. ALL THESE OCCURRED IN A 30 MIN PERIOD. I BELIEVE THE SMA MADE A STRAIGHT IN APCH TO RWY 25 AS I OBSERVED ALL THE AIRPLANES IN THE ARPT VICINITY. AT NO TIME WERE ANY OF US IN A HAZARDOUS SITUATION FROM MY VIEWPOINT AS I WAS AWARE OF THE OTHER AIRPLANES' POSITIONS. HOWEVER, W/O CONSTANT VIGILANCE, MONITORING THE RADIO LOOKING OUT OF THE COCKPIT, THERE WAS A POTENTIAL FOR MIDAIRS. I WOULD RECOMMEND THAT PROCS AS UNCTLED FIELD PROHIBIT STRAIGHT IN APCHS INSTEAD OF ONLY RECOMMENDING THAT IT NOT BE DONE (INCLUDING IFR APCHS IN VFR CONDITIONS). FOR MYSELF, I WILL PRACTICE XWIND TKOF AND LNDGS AT CTLED FIELDS AS MUCH AS POSSIBLE FROM NOW.

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