Aircraft Y had less than standard separation from aircraft X while on approach. System error.

Attributes
ACN	263435
Time
Date	199402
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : gsh
State Reference	IN
Environment
Light	Night
Aircraft 1
Controlling Facilities	tracon : sbn tracon : day
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller supervisory : 15
ASRS Report	263435
Person 2
Affiliation	government : faa
Function	other personnel other
Qualification	controller : radar
Events
Anomaly	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 : 18000
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

While investigating an aircraft accident at the goshen airport, the air traffic manager determined I was a contributory factor in an operational error. It was determined that non radar separation should have been applied to an aircraft Y arriving at the goshen airport behind another aircraft X landing at the goshen airport. It was determined that paragraph 5-70 (radar separation) of the 7110.65 could not be used, in lieu of paragraph 4-100 (non radar). Though radar coverage exists at the missed approach point, radar contact was lost with the first aircraft and had not verified on the ground or canceled IFR, or reported missed approach. This facility for 20 yrs has used radar separation at this airport per paragraph 5-70 based on the radar coverage. Paragraphs 5-70, 501 note, 10-40, 5-13 need to be more specific, reference radar coverage. Additionally define radar contact lost specifically.

Original NASA ASRS Text

Title: ACFT Y HAD LTSS FROM ACFT X WHILE ON APCH. SYS ERROR.

Narrative: WHILE INVESTIGATING AN ACFT ACCIDENT AT THE GOSHEN ARPT, THE AIR TFC MGR DETERMINED I WAS A CONTRIBUTORY FACTOR IN AN OPERROR. IT WAS DETERMINED THAT NON RADAR SEPARATION SHOULD HAVE BEEN APPLIED TO AN ACFT Y ARRIVING AT THE GOSHEN ARPT BEHIND ANOTHER ACFT X LNDG AT THE GOSHEN ARPT. IT WAS DETERMINED THAT PARAGRAPH 5-70 (RADAR SEPARATION) OF THE 7110.65 COULD NOT BE USED, IN LIEU OF PARAGRAPH 4-100 (NON RADAR). THOUGH RADAR COVERAGE EXISTS AT THE MISSED APCH POINT, RADAR CONTACT WAS LOST WITH THE FIRST ACFT AND HAD NOT VERIFIED ON THE GND OR CANCELED IFR, OR RPTED MISSED APCH. THIS FACILITY FOR 20 YRS HAS USED RADAR SEPARATION AT THIS ARPT PER PARAGRAPH 5-70 BASED ON THE RADAR COVERAGE. PARAGRAPHS 5-70, 501 NOTE, 10-40, 5-13 NEED TO BE MORE SPECIFIC, REF RADAR COVERAGE. ADDITIONALLY DEFINE RADAR CONTACT LOST SPECIFICALLY.

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.