An air carrier medium large transport was given a visual climb through a company aircraft's altitude. Once above the aircraft received a TCASII RA on the company aircraft who was climbing below him and the reporter responded to the RA and advised ATC. The medium large transport was then cleared to FL180.

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Attributes
ACN	388006
Time
Date	199712
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : bna
State Reference	TN
Altitude	msl bound lower : 15000 msl bound upper : 15300
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : ztl
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Route In Use	enroute airway : ztl
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 260 flight time total : 9000 flight time type : 3000
ASRS Report	388006
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence : published procedure
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 3000 vertical : 300
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I was the captain of flight XXX bna to bhm. We were level at 11000 ft. ATC called company traffic at 2:30 O'clock position (7 or 8 mi?). I reported company in sight and we were issued a climb to 15000 ft and maintain visual separation with company. I suggested we expedite climb above his level which we did. We leveled at 15000 ft at that time almost 2000 ft above company. The company aircraft continued to climb on a converging course, until almost directly under us and 300 ft below when we received an RA to climb. We climbed to 15300 ft and received monitor vertical speed advisory. I reported the RA to center and was shortly issued climb to FL180. I later talked to company aircraft and was told he received RA also. He was also cleared to 15000 ft. I am still at a loss as to what happened.

Original NASA ASRS Text

Title: AN ACR MLG WAS GIVEN A VISUAL CLB THROUGH A COMPANY ACFT'S ALT. ONCE ABOVE THE ACFT RECEIVED A TCASII RA ON THE COMPANY ACFT WHO WAS CLBING BELOW HIM AND THE RPTR RESPONDED TO THE RA AND ADVISED ATC. THE MLG WAS THEN CLRED TO FL180.

Narrative: I WAS THE CAPT OF FLT XXX BNA TO BHM. WE WERE LEVEL AT 11000 FT. ATC CALLED COMPANY TFC AT 2:30 O'CLOCK POS (7 OR 8 MI?). I RPTED COMPANY IN SIGHT AND WE WERE ISSUED A CLB TO 15000 FT AND MAINTAIN VISUAL SEPARATION WITH COMPANY. I SUGGESTED WE EXPEDITE CLB ABOVE HIS LEVEL WHICH WE DID. WE LEVELED AT 15000 FT AT THAT TIME ALMOST 2000 FT ABOVE COMPANY. THE COMPANY ACFT CONTINUED TO CLB ON A CONVERGING COURSE, UNTIL ALMOST DIRECTLY UNDER US AND 300 FT BELOW WHEN WE RECEIVED AN RA TO CLB. WE CLBED TO 15300 FT AND RECEIVED MONITOR VERT SPD ADVISORY. I RPTED THE RA TO CTR AND WAS SHORTLY ISSUED CLB TO FL180. I LATER TALKED TO COMPANY ACFT AND WAS TOLD HE RECEIVED RA ALSO. HE WAS ALSO CLRED TO 15000 FT. I AM STILL AT A LOSS AS TO WHAT HAPPENED.

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.