ZBW controller failed to issue traffic to climbing and descending aircraft that resulted in TCAS RA.

Attributes
ACN	628904
Time
Date	200408
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	navaid : hto.vortac
State Reference	NY
Altitude	msl bound lower : 19000 msl bound upper : 20000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zbw.artcc tower : ord.tower
Operator	common carrier : air carrier
Make Model Name	EMB ERJ 135 ER&LR
Operating Under FAR Part	Part 121
Flight Phase	descent : intermediate altitude
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zbw.artcc
Operator	common carrier : air carrier
Make Model Name	B777 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 13 controller time certified in position1 : 13 controller time certified in position2 : 11
ASRS Report	628904
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne critical
Independent Detector	aircraft equipment : tcas other controllera
Resolutory Action	flight crew : took evasive action
Miss Distance	horizontal : 6000 vertical : 1000
Supplementary
Problem Areas	Aircraft ATC Human Performance
Primary Problem	ATC Human Performance

Narrative:

The E135 was descending to FL200, its cleared altitude. The B777 was climbing to FL190, its cleared altitude. Due to several other ATC functions, TA's were not issued. The B777 had a TCAS RA to descend, the E135 had a TCAS RA to climb. Standard separation was not lost.

Original NASA ASRS Text

Title: ZBW CTLR FAILED TO ISSUE TFC TO CLBING AND DSNDING ACFT THAT RESULTED IN TCAS RA.

Narrative: THE E135 WAS DSNDING TO FL200, ITS CLRED ALT. THE B777 WAS CLBING TO FL190, ITS CLRED ALT. DUE TO SEVERAL OTHER ATC FUNCTIONS, TA'S WERE NOT ISSUED. THE B777 HAD A TCAS RA TO DSND, THE E135 HAD A TCAS RA TO CLB. STANDARD SEPARATION WAS NOT LOST.

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.