Cvg controller experience conflict during noise test with 2 departures.

Attributes
ACN	610591
Time
Date	200403
Day	Wed
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : cvg.airport
State Reference	OH
Altitude	msl single value : 3500
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : cvg.tracon
Operator	common carrier : air carrier
Make Model Name	CV 580
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Route In Use	departure : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : cvg.tracon
Operator	common carrier : air carrier
Make Model Name	DC-8 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Route In Use	departure : on vectors departure : noise abatement
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar controller : non radar
Experience	controller non radar : 5 controller radar : 11 controller time certified in position1 : 5 flight time total : 45
ASRS Report	610591
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne less severe other anomaly other
Independent Detector	other controllera
Resolutory Action	none taken : anomaly accepted
Miss Distance	horizontal : 12000 vertical : 1000
Supplementary
Problem Areas	Flight Crew Human Performance Airport ATC Human Performance
Primary Problem	Ambiguous

Narrative:

CV580 departed runway 27 was turned right to pit. DC8 departed runway 36R on a test mission for noise abatement. DC8 was issued traffic and told to maintain visual separation. When the targets merged, 1000 ft of separation was noted on mode C readouts. Perhaps contributing factor would be a departure (DC8) departing a runway never used because of noise abatement (runway 36R). However, this night the aircraft was on a test mission for airport noise.

Original NASA ASRS Text

Title: CVG CTLR EXPERIENCE CONFLICT DURING NOISE TEST WITH 2 DEPS.

Narrative: CV580 DEPARTED RWY 27 WAS TURNED R TO PIT. DC8 DEPARTED RWY 36R ON A TEST MISSION FOR NOISE ABATEMENT. DC8 WAS ISSUED TFC AND TOLD TO MAINTAIN VISUAL SEPARATION. WHEN THE TARGETS MERGED, 1000 FT OF SEPARATION WAS NOTED ON MODE C READOUTS. PERHAPS CONTRIBUTING FACTOR WOULD BE A DEP (DC8) DEPARTING A RWY NEVER USED BECAUSE OF NOISE ABATEMENT (RWY 36R). HOWEVER, THIS NIGHT THE ACFT WAS ON A TEST MISSION FOR ARPT NOISE.

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.