B737-400 aircraft cleared descent to FL180 received TCASII RA at FL260, climbed to FL270 and then returned after resolution. Controller apologized for less than legal separation.

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Attributes
ACN	362892
Time
Date	199703
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : bal
State Reference	MD
Altitude	msl bound lower : 26000 msl bound upper : 27000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zny
Operator	common carrier : air carrier
Make Model Name	B737-400
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent other
Flight Plan	IFR
Aircraft 2
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	other : unknown
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 180 flight time total : 23000 flight time type : 8000
ASRS Report	362892
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	Other
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

At FL270 center climbed us to FL180. Descending at approximately FL260 received TCASII warning. Observed TCASII traffic 12 O'clock position low. TCASII went to RA. Followed TCASII command, returned to FL270 and reported problem to ZNY. ATC reclred us to FL270 and apologized. Aircraft passed approximately 2 1/2 to 3 NM to left and 700 ft low to our aircraft. TCASII played a major part in keeping our aircraft separated and at no time was this allowed to become a near miss situation.

Original NASA ASRS Text

Title: B737-400 ACFT CLRED DSCNT TO FL180 RECEIVED TCASII RA AT FL260, CLBED TO FL270 AND THEN RETURNED AFTER RESOLUTION. CTLR APOLOGIZED FOR LESS THAN LEGAL SEPARATION.

Narrative: AT FL270 CTR CLBED US TO FL180. DSNDING AT APPROX FL260 RECEIVED TCASII WARNING. OBSERVED TCASII TFC 12 O'CLOCK POS LOW. TCASII WENT TO RA. FOLLOWED TCASII COMMAND, RETURNED TO FL270 AND RPTED PROB TO ZNY. ATC RECLRED US TO FL270 AND APOLOGIZED. ACFT PASSED APPROX 2 1/2 TO 3 NM TO L AND 700 FT LOW TO OUR ACFT. TCASII PLAYED A MAJOR PART IN KEEPING OUR ACFT SEPARATED AND AT NO TIME WAS THIS ALLOWED TO BECOME A NEAR MISS SIT.

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.