Flight crew of a B757 sbound over the gulf of mexico climbed in response to a TCASII RA from a DC10 at the same altitude. After sighting the other aircraft both aircraft turned left to increase their separation. ARTCC controller admitted that he forgot to descend their aircraft since the DC10 was assigned the same altitude.

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Attributes
ACN	420853
Time
Date	199811
Day	Mon
Local Time Of Day	0001 To 0600
Place
Locale Reference	atc facility : tbg
State Reference	FO
Altitude	msl bound lower : 35000 msl bound upper : 36000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : mkjk
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 3 Turbojet Eng
Navigation In Use	Other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 16500 flight time type : 1500
ASRS Report	420853
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 12000 flight time type : 2000
ASRS Report	421416
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence : far other anomaly other
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 18000 vertical : 1000
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Flight air carrier X was sbound to lima, peru on G437 approximately 120 NM north of duxun intersection. We were cruising at FL350 assigned, and in radio contact with kingston approach control 128.1. At XX09Z we received a TA on TCASII. First officer and I tried to locate traffic visually. The TA quickly turned into an RA annunciating 'climb!' autoplt was disconnected and an immediate climb initiated. All exterior lights were turned on. Threat aircraft turned his on and announced 'turning left, turning left!' we continued climb and also turned left. Threat aircraft to our west. When clear of conflict, we descended back to FL350 kingston center admitted he forgot to descend our aircraft to FL330. We did descend subsequently. No injuries to passenger or crew.

Original NASA ASRS Text

Title: FLC OF A B757 SBOUND OVER THE GULF OF MEXICO CLBED IN RESPONSE TO A TCASII RA FROM A DC10 AT THE SAME ALT. AFTER SIGHTING THE OTHER ACFT BOTH ACFT TURNED L TO INCREASE THEIR SEPARATION. ARTCC CTLR ADMITTED THAT HE FORGOT TO DSND THEIR ACFT SINCE THE DC10 WAS ASSIGNED THE SAME ALT.

Narrative: FLT ACR X WAS SBOUND TO LIMA, PERU ON G437 APPROX 120 NM N OF DUXUN INTXN. WE WERE CRUISING AT FL350 ASSIGNED, AND IN RADIO CONTACT WITH KINGSTON APCH CTL 128.1. AT XX09Z WE RECEIVED A TA ON TCASII. FO AND I TRIED TO LOCATE TFC VISUALLY. THE TA QUICKLY TURNED INTO AN RA ANNUNCIATING 'CLB!' AUTOPLT WAS DISCONNECTED AND AN IMMEDIATE CLB INITIATED. ALL EXTERIOR LIGHTS WERE TURNED ON. THREAT ACFT TURNED HIS ON AND ANNOUNCED 'TURNING L, TURNING L!' WE CONTINUED CLB AND ALSO TURNED L. THREAT ACFT TO OUR W. WHEN CLR OF CONFLICT, WE DSNDED BACK TO FL350 KINGSTON CTR ADMITTED HE FORGOT TO DSND OUR ACFT TO FL330. WE DID DSND SUBSEQUENTLY. NO INJURIES TO PAX OR CREW.

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.