<< >> NASA ASRS Report 456776, December 1999

ZOB controller coordinates with cle in an attempt to resolve an aircraft overtake control event between 2 air carrier's.

Attributes
ACN	456776
Time
Date	199912
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : cxr.vor
State Reference	OH
Altitude	msl single value : 10000
Environment
Flight Conditions	IMC
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zob.artcc tower : atl.tower
Operator	common carrier : air carrier
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zob.artcc
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Experience	controller radar : 9 controller time certified in position1 : 5
ASRS Report	456776
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	atc equipment : conflict alert other controllera other controllerb
Resolutory Action	controller : issued alert
Consequence	faa : investigated
Miss Distance	horizontal : 25800 vertical : 300
Supplementary
Problem Areas	Airspace Structure ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Inter Facility Coordination Failure Operational Error

Narrative:

Air carrier Y, B737, was being vectored behind air carrier X, E145. Both aircraft were slowed to 210 KTS because of approach control's request. I diverted my attention to deal with other aircraft, including an aircraft who had called on my frequency who wasn't supposed to. When I realized that the vector on air carrier Y would be insufficient, I asked cle approach to descend the other aircraft X out of the way.

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Original NASA ASRS Text

Title: ZOB CTLR COORDINATES WITH CLE IN AN ATTEMPT TO RESOLVE AN ACFT OVERTAKE CTL EVENT BTWN 2 ACR'S.

Narrative: ACR Y, B737, WAS BEING VECTORED BEHIND ACR X, E145. BOTH ACFT WERE SLOWED TO 210 KTS BECAUSE OF APCH CTL'S REQUEST. I DIVERTED MY ATTN TO DEAL WITH OTHER ACFT, INCLUDING AN ACFT WHO HAD CALLED ON MY FREQ WHO WASN'T SUPPOSED TO. WHEN I REALIZED THAT THE VECTOR ON ACR Y WOULD BE INSUFFICIENT, I ASKED CLE APCH TO DSND THE OTHER ACFT X OUT OF THE WAY.

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.