J3 pilot and helicopter almost collide on an uncontrolled part of the airport at myf.

Attributes
ACN	561928
Time
Date	200210
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : myf.airport
State Reference	CA
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : myf.tower
Operator	general aviation : personal
Make Model Name	J3 Cub
Operating Under FAR Part	Part 91
Flight Phase	ground : taxi
Flight Plan	None
Aircraft 2
Controlling Facilities	tower : myf.tower
Make Model Name	Helicopter
Flight Phase	climbout : takeoff
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : multi engine pilot : instrument pilot : flight engineer pilot : commercial pilot : cfi pilot : atp
Experience	flight time last 90 days : 80 flight time total : 15000 flight time type : 4000
ASRS Report	561928
Person 2
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : ground critical ground encounters other other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact other
Miss Distance	horizontal : 50 vertical : 20
Supplementary
Problem Areas	FAA ATC Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

Helicopter launched from behind hangar #xx, not visible from taxiway. I saw the helicopter immediately as it appeared from behind the building. I am sure I stopped out of reflex, but the helicopter was visible only for a blurred fraction of a second.

Original NASA ASRS Text

Title: J3 PLT AND HELI ALMOST COLLIDE ON AN UNCTLED PART OF THE ARPT AT MYF.

Narrative: HELI LAUNCHED FROM BEHIND HANGAR #XX, NOT VISIBLE FROM TXWY. I SAW THE HELI IMMEDIATELY AS IT APPEARED FROM BEHIND THE BUILDING. I AM SURE I STOPPED OUT OF REFLEX, BUT THE HELI WAS VISIBLE ONLY FOR A BLURRED FRACTION OF A SECOND.

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.