Close proximity GA-small aircraft biplane military helicopter.

Attributes
ACN	98172
Time
Date	198811
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : dfw
State Reference	TX
Altitude	agl bound lower : 1500 agl bound upper : 1500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Small Aircraft
Flight Phase	cruise other
Flight Plan	None
Aircraft 2
Operator	other
Make Model Name	Helicopter
Flight Phase	cruise other
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : atp
Experience	flight time last 90 days : 250 flight time total : 12000 flight time type : 40
ASRS Report	98172
Person 2
Affiliation	government : military
Function	flight crew : captain oversight : pic
Qualification	pilot : military
Events
Anomaly	conflict : airborne less severe
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Miss Distance	horizontal : 750 vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

While cruising at 1500' AGL, encountered military helicopter opp direction. Passed latitude about 3000' sep at which time he reversed course. I reversed course and we passed about 500-1000' apart. He stopped at destination airport to report to me he thought we were within 100' of each other. I have been trained to judge distance on cubic corporation acmi ranges, this instance points out a near miss problem in that how close airport pass is a judgement problem. We regularly fly in the ATC system with 500-1000' positive sep which is close. One pilot's 'close' near miss is another's everyday occurrence in the ATC system.

Original NASA ASRS Text

Title: CLOSE PROX GA-SMA BIPLANE MIL HELICOPTER.

Narrative: WHILE CRUISING AT 1500' AGL, ENCOUNTERED MIL HELI OPP DIRECTION. PASSED LAT ABOUT 3000' SEP AT WHICH TIME HE REVERSED COURSE. I REVERSED COURSE AND WE PASSED ABOUT 500-1000' APART. HE STOPPED AT DEST ARPT TO RPT TO ME HE THOUGHT WE WERE WITHIN 100' OF EACH OTHER. I HAVE BEEN TRAINED TO JUDGE DISTANCE ON CUBIC CORPORATION ACMI RANGES, THIS INSTANCE POINTS OUT A NEAR MISS PROB IN THAT HOW CLOSE ARPT PASS IS A JUDGEMENT PROB. WE REGULARLY FLY IN THE ATC SYS WITH 500-1000' POSITIVE SEP WHICH IS CLOSE. ONE PLT'S 'CLOSE' NEAR MISS IS ANOTHER'S EVERYDAY OCCURRENCE IN THE ATC SYS.

Data retrieved from NASA's ASRS site as of August 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.