Narrative:

We leveled off about 2300 ft and did some level turns in both directions, began another climb as I had my student pilot make turns that would keep us over the hills east of vallejo. I had him level off on a heading of 330 degrees and he was instructed to make a right turn. As we came around the turn, a twin engine jet -- possibly a B737, appeared somewhat lower and to our right. He was in a climbing right turn. I took the controls and banked quickly to the left until coming out on a heading near due west. My turn and the turn of the B737 easily cleared each other but in turning away I could not determine exact proximity. I had the student resume his level turns during which time he lost altitude to below 4000 ft but we were back over the hills. I had him make 2 consecutive right turns when the B737 again appeared at our altitude but moving across our nose. He was on a heading of about 300 degrees while we were about 070 degrees. We were not in danger of a collision but wake turbulence could have destroyed us. I horsed back on the yoke and gained 200-300 ft which was sufficient to avoid any turbulence. Suffice it to say we departed the area for the far side of napa. My mistake was in expecting him to be long-gone as we completed 4 and perhaps 5 90 degree turns.

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Original NASA ASRS Text

Title: A POTENTIAL CONFLICT WITH LTSS WHEN A C172 FLIES INTO SUU'S A-682 IN PROX OF AN ALERT AREA. EVASIVE ACTION CLB IS PERFORMED AND HE LEAVES THE AREA.

Narrative: WE LEVELED OFF ABOUT 2300 FT AND DID SOME LEVEL TURNS IN BOTH DIRECTIONS, BEGAN ANOTHER CLB AS I HAD MY STUDENT PLT MAKE TURNS THAT WOULD KEEP US OVER THE HILLS E OF VALLEJO. I HAD HIM LEVEL OFF ON A HDG OF 330 DEGS AND HE WAS INSTRUCTED TO MAKE A R TURN. AS WE CAME AROUND THE TURN, A TWIN ENG JET -- POSSIBLY A B737, APPEARED SOMEWHAT LOWER AND TO OUR R. HE WAS IN A CLBING R TURN. I TOOK THE CTLS AND BANKED QUICKLY TO THE L UNTIL COMING OUT ON A HDG NEAR DUE W. MY TURN AND THE TURN OF THE B737 EASILY CLRED EACH OTHER BUT IN TURNING AWAY I COULD NOT DETERMINE EXACT PROX. I HAD THE STUDENT RESUME HIS LEVEL TURNS DURING WHICH TIME HE LOST ALT TO BELOW 4000 FT BUT WE WERE BACK OVER THE HILLS. I HAD HIM MAKE 2 CONSECUTIVE R TURNS WHEN THE B737 AGAIN APPEARED AT OUR ALT BUT MOVING ACROSS OUR NOSE. HE WAS ON A HDG OF ABOUT 300 DEGS WHILE WE WERE ABOUT 070 DEGS. WE WERE NOT IN DANGER OF A COLLISION BUT WAKE TURB COULD HAVE DESTROYED US. I HORSED BACK ON THE YOKE AND GAINED 200-300 FT WHICH WAS SUFFICIENT TO AVOID ANY TURB. SUFFICE IT TO SAY WE DEPARTED THE AREA FOR THE FAR SIDE OF NAPA. MY MISTAKE WAS IN EXPECTING HIM TO BE LONG-GONE AS WE COMPLETED 4 AND PERHAPS 5 90 DEG TURNS.

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.