Use of incorrect CTAF frequency contributes to near midair collision for BE36 pilot at wdr.

Attributes
ACN	775576
Time
Date	200802
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : wdr.airport
State Reference	GA
Altitude	msl single value : 4200
Environment
Weather Elements	other
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Bonanza 36
Operating Under FAR Part	Part 91
Flight Phase	descent : intermediate altitude
Flight Plan	None
Aircraft 2
Operator	general aviation : personal
Make Model Name	Small Aircraft
Operating Under FAR Part	Part 91
Flight Phase	climbout : takeoff
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : private pilot : instrument
Experience	flight time last 90 days : 18 flight time total : 420 flight time type : 68
ASRS Report	775576
Person 2
Affiliation	other
Function	flight crew : single pilot
Events
Anomaly	aircraft equipment problem : critical conflict : nmac non adherence : published procedure other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem
Miss Distance	horizontal : 0 vertical : 100
Supplementary
Problem Areas	Flight Crew Human Performance Chart Or Publication Airport
Primary Problem	Ambiguous

Narrative:

Flew to wdr to practice lndgs. Approximately 7 mi south of wdr; I dialed in what I thought was the CTAF to monitor local traffic. Heard no activity; so after a few mins I realized I had entered the wrong frequency. Then entered the correct frequency and reported my position 2 mi south of airport and asked for traffic. Immediately a pilot of a cessna or piper claimed he tried to contact me 3 times and passed 100 ft below me. I never saw the traffic and departed the area immediately. At the time of my radio call I was approximately 3200 ft AGL. The wrong frequency I dialed was 121.72; found on my approach plates instead of 123.0.

Original NASA ASRS Text

Title: USE OF INCORRECT CTAF FREQ CONTRIBUTES TO NMAC FOR BE36 PLT AT WDR.

Narrative: FLEW TO WDR TO PRACTICE LNDGS. APPROX 7 MI S OF WDR; I DIALED IN WHAT I THOUGHT WAS THE CTAF TO MONITOR LCL TFC. HEARD NO ACTIVITY; SO AFTER A FEW MINS I REALIZED I HAD ENTERED THE WRONG FREQ. THEN ENTERED THE CORRECT FREQ AND RPTED MY POS 2 MI S OF ARPT AND ASKED FOR TFC. IMMEDIATELY A PLT OF A CESSNA OR PIPER CLAIMED HE TRIED TO CONTACT ME 3 TIMES AND PASSED 100 FT BELOW ME. I NEVER SAW THE TFC AND DEPARTED THE AREA IMMEDIATELY. AT THE TIME OF MY RADIO CALL I WAS APPROX 3200 FT AGL. THE WRONG FREQ I DIALED WAS 121.72; FOUND ON MY APCH PLATES INSTEAD OF 123.0.

Data retrieved from NASA's ASRS site as of May 2009 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.