ZNY handoff controller observed conflict developing at FL350 between enroute and descending aircraft; controller advised; corrective action taken; no operational error.

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Attributes
ACN	791080
Time
Date	200806
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : jfk.airport
State Reference	NY
Altitude	msl single value : 35000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zny.artcc
Operator	common carrier : air carrier
Make Model Name	B777 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zny.artcc
Operator	common carrier : air carrier
Make Model Name	A320
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : handoff position controller : radar
Qualification	controller : radar controller : non radar
Experience	controller non radar : 19 controller radar : 19 controller time certified in position1 : 19
ASRS Report	791080
Events
Anomaly	conflict : airborne less severe
Independent Detector	atc equipment : conflict alert other controllera
Resolutory Action	controller : issued alert controller : issued new clearance
Miss Distance	horizontal : 30000 vertical : 700
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance

Narrative:

The radar controller issued a descent clearance to aircraft Y from FL380 to 14000 ft. Aircraft X was crossing aircraft Y route at FL350. When I noticed the situation; I notified the radar controller the descent wasn't going to work. The radar controller then stopped the aircraft Y descent at FL360 but the aircraft was already through FL360. The aircraft then climbed back to FL360. The aircraft was in the jball at FL357. The supervisor was aware of the situation and said it was fine.

Original NASA ASRS Text

Title: ZNY HDOF CTLR OBSERVED CONFLICT DEVELOPING AT FL350 BETWEEN ENROUTE AND DESCENDING ACFT; CTLR ADVISED; CORRECTIVE ACTION TAKEN; NO OPERROR.

Narrative: THE RADAR CTLR ISSUED A DSCNT CLRNC TO ACFT Y FROM FL380 TO 14000 FT. ACFT X WAS XING ACFT Y RTE AT FL350. WHEN I NOTICED THE SITUATION; I NOTIFIED THE RADAR CTLR THE DSCNT WASN'T GOING TO WORK. THE RADAR CTLR THEN STOPPED THE ACFT Y DSCNT AT FL360 BUT THE ACFT WAS ALREADY THROUGH FL360. THE ACFT THEN CLBED BACK TO FL360. THE ACFT WAS IN THE JBALL AT FL357. THE SUPVR WAS AWARE OF THE SITUATION AND SAID IT WAS FINE.

Data retrieved from NASA's ASRS site as of May 2009 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.