Hei Y had less than standard separation from small aircraft X. System error.

Attributes
ACN	208197
Time
Date	199204
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : sjc
State Reference	CA
Altitude	agl bound lower : 300 agl bound upper : 300
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : sjc
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	ground other : taxi
Flight Plan	None
Aircraft 2
Make Model Name	Helicopter
Flight Phase	climbout : takeoff
Flight Plan	None
Person 1
Affiliation	government : faa
Function	controller : ground
Qualification	controller : developmental
ASRS Report	208197
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Events
Anomaly	conflict : ground less severe conflict : airborne less severe non adherence : required legal separation non adherence : published procedure
Independent Detector	other other : unspecified atc
Resolutory Action	none taken : detected after the fact
Consequence	faa : investigated
Miss Distance	horizontal : 0 vertical : 300
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Intra Facility Coordination Failure Operational Error

Narrative:

Gave away taxiway to local controller -- taxied fixed wing small aircraft X to runway, helicopter Y departed helicopter pad and flew over taxiing small aircraft X. Helicopter Y was approximately 300-500 ft when this happened. Classified as an operational error.

Original NASA ASRS Text

Title: HEI Y HAD LTSS FROM SMA X. SYS ERROR.

Narrative: GAVE AWAY TAXIWAY TO LCL CTLR -- TAXIED FIXED WING SMA X TO RWY, HELI Y DEPARTED HELI PAD AND FLEW OVER TAXIING SMA X. HELI Y WAS APPROX 300-500 FT WHEN THIS HAPPENED. CLASSIFIED AS AN OPERROR.

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.