Near midair collision between a piper PA28 on a left crosswind departure and a mooney on a left downwind entry. The trainee pilot in the PA28 made a quick diving left turn to avoid collision.

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Attributes
ACN	383380
Time
Date	199710
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : sts
State Reference	CA
Altitude	msl bound lower : 925 msl bound upper : 925
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : sts
Operator	general aviation : personal
Make Model Name	PA-28 Cherokee/Archer II/Dakota/Pillan/Warrior
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude
Flight Plan	None
Aircraft 2
Make Model Name	Mooney Aircraft Undifferentiated or Other Model
Operating Under FAR Part	other : unknown
Flight Phase	other
Person 1
Affiliation	Other
Function	instruction : instructor
Qualification	other other : other pilot : commercial pilot : cfi pilot : instrument
Experience	flight time last 90 days : 150 flight time total : 1290 flight time type : 150
ASRS Report	383380
Person 2
Affiliation	Other
Function	instruction : trainee
Qualification	pilot : student
Events
Anomaly	conflict : nmac other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 0 vertical : 20
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

A student and myself were departing santa rosa on a left downwind departure off of runway 14. We knew there was traffic inbound from the east because we had heard their initial call up as we were holding short. The controller never issued a specific TA for us about the mooney or to them about us, so we weren't aware of their exact position but we were looking. After we turned left crosswind we noticed the mooney on a direct downwind entry. The other aircraft was too close to turn right and pass behind him so we made a very steep left descending turn and the mooney passed over us. I don't believe the pilot of the mooney ever saw us until he passed overhead. If he had, it wouldn't have been so close. I think this could have been prevented if the pilots of both airplanes had been issued a TA. A couple other things that would help prevent this is if we had climbed to a higher altitude before turning crosswind and if the mooney pilot had made a standard 45 degree entry to the downwind.

Original NASA ASRS Text

Title: NMAC BTWN A PIPER PA28 ON A L XWIND DEP AND A MOONEY ON A L DOWNWIND ENTRY. THE TRAINEE PLT IN THE PA28 MADE A QUICK DIVING L TURN TO AVOID COLLISION.

Narrative: A STUDENT AND MYSELF WERE DEPARTING SANTA ROSA ON A L DOWNWIND DEP OFF OF RWY 14. WE KNEW THERE WAS TFC INBOUND FROM THE E BECAUSE WE HAD HEARD THEIR INITIAL CALL UP AS WE WERE HOLDING SHORT. THE CTLR NEVER ISSUED A SPECIFIC TA FOR US ABOUT THE MOONEY OR TO THEM ABOUT US, SO WE WEREN'T AWARE OF THEIR EXACT POS BUT WE WERE LOOKING. AFTER WE TURNED L XWIND WE NOTICED THE MOONEY ON A DIRECT DOWNWIND ENTRY. THE OTHER ACFT WAS TOO CLOSE TO TURN R AND PASS BEHIND HIM SO WE MADE A VERY STEEP L DSNDING TURN AND THE MOONEY PASSED OVER US. I DON'T BELIEVE THE PLT OF THE MOONEY EVER SAW US UNTIL HE PASSED OVERHEAD. IF HE HAD, IT WOULDN'T HAVE BEEN SO CLOSE. I THINK THIS COULD HAVE BEEN PREVENTED IF THE PLTS OF BOTH AIRPLANES HAD BEEN ISSUED A TA. A COUPLE OTHER THINGS THAT WOULD HELP PREVENT THIS IS IF WE HAD CLBED TO A HIGHER ALT BEFORE TURNING XWIND AND IF THE MOONEY PLT HAD MADE A STANDARD 45 DEG ENTRY TO THE DOWNWIND.

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.