<< >> NASA ASRS Report 158415, September 1990

ARTCC controller states radio communication problem was the cause of his system error while vectoring aircraft for spacing.

Attributes
ACN	158415
Time
Date	199009
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : jfl airport : ord
State Reference	WI
Altitude	msl bound lower : 12000 msl bound upper : 12000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tower : msp
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute : on vectors enroute airway : zau
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller non radar : 4 controller radar : 4
ASRS Report	158415
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 other anomaly other
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	other
Consequence	faa : investigated
Miss Distance	horizontal : 12000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error other
Situations
ATC Facility	other physical facility

Narrative:

While working at the farmm sector of ZAU, sequencing inbound traffic to ord, large transport X and medium large transport Y were being vectored around WX and for sequencing. When control actions to provide proper in trail to ord were attempted. A loss of frequency occurred resulting in less than standard separation between large transport X and medium large transport Y. If more efficient and reliable radios were supplied to the ATC system this situation might not have occurred.

Related reports:

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Original NASA ASRS Text

Title: ARTCC CTLR STATES RADIO COM PROBLEM WAS THE CAUSE OF HIS SYSTEM ERROR WHILE VECTORING ACFT FOR SPACING.

Narrative: WHILE WORKING AT THE FARMM SECTOR OF ZAU, SEQUENCING INBND TFC TO ORD, LGT X AND MLG Y WERE BEING VECTORED AROUND WX AND FOR SEQUENCING. WHEN CTL ACTIONS TO PROVIDE PROPER IN TRAIL TO ORD WERE ATTEMPTED. A LOSS OF FREQ OCCURRED RESULTING IN LESS THAN STANDARD SEPARATION BTWN LGT X AND MLG Y. IF MORE EFFICIENT AND RELIABLE RADIOS WERE SUPPLIED TO THE ATC SYS THIS SITUATION MIGHT NOT HAVE OCCURRED.

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.