Cessna 150 pilot reporter encounters turbulence following piper aztec.

Attributes
ACN	305015
Time
Date	199504
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : sbn
State Reference	IN
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sbn tower : prg
Operator	general aviation : personal
Make Model Name	Cessna 152
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Flight Plan	VFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	PA-23-250 Aztec
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Experience	flight time last 90 days : 20 flight time total : 400 flight time type : 150
ASRS Report	305015
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : cfi
Events
Anomaly	inflight encounter other other anomaly other
Independent Detector	other other : unspecified cockpit
Resolutory Action	flight crew : regained aircraft control
Consequence	Other
Supplementary
Air Traffic Incident	other

Narrative:

Flight of 3 from kenosha wisconsin to yip. 2 cessna 152's and a piper aztec. In calm air at 105 KTS I experienced uncontrolled rolls of left and right 45 degrees. One of the cessna 152's and the aztec were side-by-side. I was behind both several hundred yards. After discussing the incident with the other pilots, it appears that I strayed into the wake of the aztec, which was flying quite slow to keep pace with the cessna 152's. In calm air, the unexpected rolls were very disconcerting, as it happened 3 times in a 5 min interval. I had concerns about mechanical problems since neither the other cessna 152 or aztec reported any problems. Callback conversation with reporter revealed the following: the reporter said he has been flying about 5 years to accumulate his 400 hours. He is currently working to add an instrument rating to his private license. His flight instructor was in the piper aztec. The reporter, the instructor and another cessna 152 pilot had pre-briefed for this formation flight of 3 aircraft. He was amazed at how much turbulence even the cessna 152 generated and left in its path.

Original NASA ASRS Text

Title: CESSNA 150 PLT RPTR ENCOUNTERS TURB FOLLOWING PIPER AZTEC.

Narrative: FLT OF 3 FROM KENOSHA WISCONSIN TO YIP. 2 CESSNA 152'S AND A PIPER AZTEC. IN CALM AIR AT 105 KTS I EXPERIENCED UNCTLED ROLLS OF L AND R 45 DEGS. ONE OF THE CESSNA 152'S AND THE AZTEC WERE SIDE-BY-SIDE. I WAS BEHIND BOTH SEVERAL HUNDRED YARDS. AFTER DISCUSSING THE INCIDENT WITH THE OTHER PLTS, IT APPEARS THAT I STRAYED INTO THE WAKE OF THE AZTEC, WHICH WAS FLYING QUITE SLOW TO KEEP PACE WITH THE CESSNA 152'S. IN CALM AIR, THE UNEXPECTED ROLLS WERE VERY DISCONCERTING, AS IT HAPPENED 3 TIMES IN A 5 MIN INTERVAL. I HAD CONCERNS ABOUT MECHANICAL PROBS SINCE NEITHER THE OTHER CESSNA 152 OR AZTEC RPTED ANY PROBS. CALLBACK CONVERSATION WITH REPORTER REVEALED THE FOLLOWING: THE RPTR SAID HE HAS BEEN FLYING ABOUT 5 YEARS TO ACCUMULATE HIS 400 HRS. HE IS CURRENTLY WORKING TO ADD AN INST RATING TO HIS PVT LICENSE. HIS FLT INSTRUCTOR WAS IN THE PIPER AZTEC. THE RPTR, THE INSTRUCTOR AND ANOTHER CESSNA 152 PLT HAD PRE-BRIEFED FOR THIS FORMATION FLT OF 3 ACFT. HE WAS AMAZED AT HOW MUCH TURB EVEN THE CESSNA 152 GENERATED AND LEFT IN ITS PATH.

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.