Narrative:

In the late morning 6/X/90, I was descending to enter the traffic pattern at apv. At a point about 8 NM sse of the airport, while I was descending through 1300' AGL, a red and white small aircraft Y popped above the INS panel, at the 12:30 position. Less than 200 yds in front of me. At the time, I would estimate that the small aircraft Y was flying level, or even climbing at something less than 80 mph. I was descending at about 180 mph. Though I had been monitoring unicom and had already transmitted my own position, the aircraft had made no transmission of its position. I was keeping an eye on the airspeed and altitude, trying to get low enough to slow down before entering the pattern, and may have been distracted from the view forward. In any event, when I saw the aircraft I lowered the nose further and altered course to overtake on the right. After passing the aircraft, I encountered a few good jolts of turbulence. I needed to slow down immediately, but I was concerned about the aircraft behind me. As I added back pressure to slow down, I looked back over my shoulder--first to the left, then to the right, to ascertain the position of the other aircraft. Immediately after looking back, I encountered turbulence which registered over 4 G's on the aircraft G meter. The aircraft then rolled past 90 degrees, to the left, and I was able to recover the aircraft by completing the roll. There was no collision and neither of the occupants of the aircraft were hurt. Contributing factors to this incident include: 1) failure on the part of the other pilot to follow radio procedures as outlined in the aim, 2) a blind spot behind the INS panel from 12-2 O'clock low, C) the additional airspeed my aircraft gained because I had to duck under the other aircraft, and 4) the unpredictable nature of a summertime desert convective activity.

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Original NASA ASRS Text

Title: NMAC.

Narrative: IN THE LATE MORNING 6/X/90, I WAS DSNDING TO ENTER THE TFC PATTERN AT APV. AT A POINT ABOUT 8 NM SSE OF THE ARPT, WHILE I WAS DSNDING THROUGH 1300' AGL, A RED AND WHITE SMA Y POPPED ABOVE THE INS PANEL, AT THE 12:30 POS. LESS THAN 200 YDS IN FRONT OF ME. AT THE TIME, I WOULD ESTIMATE THAT THE SMA Y WAS FLYING LEVEL, OR EVEN CLBING AT SOMETHING LESS THAN 80 MPH. I WAS DSNDING AT ABOUT 180 MPH. THOUGH I HAD BEEN MONITORING UNICOM AND HAD ALREADY XMITTED MY OWN POS, THE ACFT HAD MADE NO XMISSION OF ITS POS. I WAS KEEPING AN EYE ON THE AIRSPD AND ALT, TRYING TO GET LOW ENOUGH TO SLOW DOWN BEFORE ENTERING THE PATTERN, AND MAY HAVE BEEN DISTRACTED FROM THE VIEW FORWARD. IN ANY EVENT, WHEN I SAW THE ACFT I LOWERED THE NOSE FURTHER AND ALTERED COURSE TO OVERTAKE ON THE RIGHT. AFTER PASSING THE ACFT, I ENCOUNTERED A FEW GOOD JOLTS OF TURB. I NEEDED TO SLOW DOWN IMMEDIATELY, BUT I WAS CONCERNED ABOUT THE ACFT BEHIND ME. AS I ADDED BACK PRESSURE TO SLOW DOWN, I LOOKED BACK OVER MY SHOULDER--FIRST TO THE LEFT, THEN TO THE RIGHT, TO ASCERTAIN THE POS OF THE OTHER ACFT. IMMEDIATELY AFTER LOOKING BACK, I ENCOUNTERED TURB WHICH REGISTERED OVER 4 G'S ON THE ACFT G METER. THE ACFT THEN ROLLED PAST 90 DEGS, TO THE LEFT, AND I WAS ABLE TO RECOVER THE ACFT BY COMPLETING THE ROLL. THERE WAS NO COLLISION AND NEITHER OF THE OCCUPANTS OF THE ACFT WERE HURT. CONTRIBUTING FACTORS TO THIS INCIDENT INCLUDE: 1) FAILURE ON THE PART OF THE OTHER PLT TO FOLLOW RADIO PROCS AS OUTLINED IN THE AIM, 2) A BLIND SPOT BEHIND THE INS PANEL FROM 12-2 O'CLOCK LOW, C) THE ADDITIONAL AIRSPD MY ACFT GAINED BECAUSE I HAD TO DUCK UNDER THE OTHER ACFT, AND 4) THE UNPREDICTABLE NATURE OF A SUMMERTIME DESERT CONVECTIVE ACTIVITY.

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.