HU16 pilot on approach at 61B, lake unicom, encounters near midair collision with atx helicopter on airport unicom at 61B.

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Attributes
ACN	500172
Time
Date	200102
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : 61b.airport
State Reference	NV
Altitude	msl single value : 3200
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Grumman Corp Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Route In Use	approach : traffic pattern
Flight Plan	None
Aircraft 2
Operator	common carrier : air taxi
Make Model Name	Helicopter
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Route In Use	approach : traffic pattern
Person 1
Affiliation	other
Function	flight crew : captain
Qualification	pilot : multi engine pilot : cfi pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 300 flight time total : 17000 flight time type : 400
ASRS Report	500172
Person 2
Affiliation	company : air taxi
Function	flight crew : single pilot
Qualification	pilot : commercial
Events
Anomaly	non adherence : published procedure non adherence : far other spatial deviation
Independent Detector	other flight crewa
Miss Distance	horizontal : 100 vertical : 100
Supplementary
Problem Areas	Flight Crew Human Performance Airport

Narrative:

We were approaching 61B for landing. The helicopter passed below and behind our 5 O'clock position. We had announced our position on lake frequency 122.75, and immediately changed over to 122.70 for unicom advisories. We were on a steady course and altitude. Helicopter failed to see and avoid until last moment. He was on boulder dam frequency 120.65. There are numerous operations in the boulder dam vicinity. The necessity to monitor appropriate frequencys is crucial. However, the primary responsibility of every pilot is 'see and avoid,' due to the close proximity of lake, dam, and airport, there can be gaps and/or lapses in monitoring.

Original NASA ASRS Text

Title: HU16 PLT ON APCH AT 61B, LAKE UNICOM, ENCOUNTERS NMAC WITH ATX HELI ON ARPT UNICOM AT 61B.

Narrative: WE WERE APCHING 61B FOR LNDG. THE HELI PASSED BELOW AND BEHIND OUR 5 O'CLOCK POS. WE HAD ANNOUNCED OUR POS ON LAKE FREQ 122.75, AND IMMEDIATELY CHANGED OVER TO 122.70 FOR UNICOM ADVISORIES. WE WERE ON A STEADY COURSE AND ALT. HELI FAILED TO SEE AND AVOID UNTIL LAST MOMENT. HE WAS ON BOULDER DAM FREQ 120.65. THERE ARE NUMEROUS OPS IN THE BOULDER DAM VICINITY. THE NECESSITY TO MONITOR APPROPRIATE FREQS IS CRUCIAL. HOWEVER, THE PRIMARY RESPONSIBILITY OF EVERY PLT IS 'SEE AND AVOID,' DUE TO THE CLOSE PROX OF LAKE, DAM, AND ARPT, THERE CAN BE GAPS AND/OR LAPSES IN MONITORING.

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.