<< >> NASA ASRS Report 158991, October 1990

Departure controller distracted by arrival traffic and did not see the second medium large transport departure aircraft overtaking the first one until separation was lost.

Attributes
ACN	158991
Time
Date	199010
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : oma
State Reference	NE
Altitude	msl bound lower : 5500 msl bound upper : 6000
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : oma
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Route In Use	departure other enroute : on vectors enroute airway : oma
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Route In Use	departure other enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
ASRS Report	158991
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	other
Consequence	Other
Miss Distance	horizontal : 12000 vertical : 500
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Medium large transport X departed and I turned him to the southeast (departing to the northwest). He was 4 mi from the airport when the second medium large transport Y departed wanting to go to the northeast and the first aircraft was 4 mi ahead. I turned the second thinking he is of like aircraft and would not catch the first. The first medium large transport X was slow turning and climbing while the second medium large transport Y was a little faster in his climb and turning. They did get less than 3 mi and less than 1000'. What probably took my attention away from the two was two other aircraft that were on vectors for airport and a departure flight.

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Original NASA ASRS Text

Title: DEP CTLR DISTRACTED BY ARR TRAFFIC AND DID NOT SEE THE SECOND MLG DEP ACFT OVERTAKING THE FIRST ONE UNTIL SEPARATION WAS LOST.

Narrative: MLG X DEPARTED AND I TURNED HIM TO THE SE (DEPARTING TO THE NW). HE WAS 4 MI FROM THE ARPT WHEN THE SEC MLG Y DEPARTED WANTING TO GO TO THE NE AND THE FIRST ACFT WAS 4 MI AHEAD. I TURNED THE SEC THINKING HE IS OF LIKE ACFT AND WOULD NOT CATCH THE FIRST. THE FIRST MLG X WAS SLOW TURNING AND CLBING WHILE THE SEC MLG Y WAS A LITTLE FASTER IN HIS CLB AND TURNING. THEY DID GET LESS THAN 3 MI AND LESS THAN 1000'. WHAT PROBABLY TOOK MY ATTN AWAY FROM THE TWO WAS TWO OTHER ACFT THAT WERE ON VECTORS FOR ARPT AND A DEP FLT.

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.