ARTCC radar controller issued descent clearance to air carrier (X) through occupied altitude, then saw he would have a problem so he expedited the descent of air carrier (X) and climbed air carrier (Y). Air carrier (X) received a TCASII RA and responded by climbing back to previous altitude. Separation was lost during air carrier (X) reaction to the TCASII alert.

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Attributes
ACN	323499
Time
Date	199512
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : zzv
State Reference	OH
Altitude	msl bound lower : 25000 msl bound upper : 25400
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zid
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	climbout : intermediate altitude cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : non radar
Qualification	controller : radar
Experience	controller radar : 6
ASRS Report	323499
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Events
Anomaly	conflict : airborne less severe non adherence : clearance non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 19200 vertical : 400
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier X at FL260 with clearance to FL240 at pilot's discretion. Air carrier Y climbing eastbound to FL250. Radar controller recognized a possible situation and expedited air carrier X to FL190 and air carrier Y to FL270. Air carrier X responded that he was climbing back up because of an RA alert due to TCASII. Air carrier Y was told to maintain FL250. Separation was lost between FL250 and FL260. The pilot of air carrier X reported that he had the other plane in sight.

Original NASA ASRS Text

Title: ARTCC RADAR CTLR ISSUED DSCNT CLRNC TO ACR (X) THROUGH OCCUPIED ALT, THEN SAW HE WOULD HAVE A PROB SO HE EXPEDITED THE DSCNT OF ACR (X) AND CLBED ACR (Y). ACR (X) RECEIVED A TCASII RA AND RESPONDED BY CLBING BACK TO PREVIOUS ALT. SEPARATION WAS LOST DURING ACR (X) REACTION TO THE TCASII ALERT.

Narrative: ACR X AT FL260 WITH CLRNC TO FL240 AT PLT'S DISCRETION. ACR Y CLBING EBOUND TO FL250. RADAR CTLR RECOGNIZED A POSSIBLE SIT AND EXPEDITED ACR X TO FL190 AND ACR Y TO FL270. ACR X RESPONDED THAT HE WAS CLBING BACK UP BECAUSE OF AN RA ALERT DUE TO TCASII. ACR Y WAS TOLD TO MAINTAIN FL250. SEPARATION WAS LOST BTWN FL250 AND FL260. THE PLT OF ACR X RPTED THAT HE HAD THE OTHER PLANE IN SIGHT.

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.