An ARTCC radar controller issued a descent clearance to air carrier Y, at pilot's discretion, and the flight crew started their descent sooner than the controller expected. Less than standard separation from air carrier X resulted.

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Attributes
ACN	425116
Time
Date	199901
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : swl
State Reference	MD
Altitude	msl bound lower : 28000 msl bound upper : 29000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : flight data
Experience	controller non radar : 4 controller radar : 1
ASRS Report	425116
Person 2
Affiliation	government : faa
Function	controller : radar
ASRS Report	425028
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence : published procedure other anomaly other
Independent Detector	atc equipment other atc equipment : unspecified other controllera other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	faa : investigated Other
Miss Distance	horizontal : 12000 vertical : 200
Supplementary
Air Traffic Incident	Operational Error

Narrative:

North of salisbury, md. Callback conversation with reporter revealed the following information: this ARTCC data controller said that he was on the landline coordinating with an ngu controller when this event occurred. He said that he did not hear the original clearance and he was completely surprised when the conflict alert warning sounded. He said that after a review by the facility management he was found to not be at fault. This reporter could not recall the type of air carrier aircraft involved.

Original NASA ASRS Text

Title: AN ARTCC RADAR CTLR ISSUED A DSCNT CLRNC TO ACR Y, AT PLT'S DISCRETION, AND THE FLC STARTED THEIR DSCNT SOONER THAN THE CTLR EXPECTED. LTSS FROM ACR X RESULTED.

Narrative: N OF SALISBURY, MD. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THIS ARTCC DATA CTLR SAID THAT HE WAS ON THE LANDLINE COORDINATING WITH AN NGU CTLR WHEN THIS EVENT OCCURRED. HE SAID THAT HE DID NOT HEAR THE ORIGINAL CLRNC AND HE WAS COMPLETELY SURPRISED WHEN THE CONFLICT ALERT WARNING SOUNDED. HE SAID THAT AFTER A REVIEW BY THE FACILITY MGMNT HE WAS FOUND TO NOT BE AT FAULT. THIS RPTR COULD NOT RECALL THE TYPE OF ACR ACFT INVOLVED.

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.