<< >> NASA ASRS Report 620305, June 2004

A CL65 flight crew receive a TCASII RA after departing atl and leveled off at 15500 ft. A question of similar call sign response.

Attributes
ACN	620305
Time
Date	200406
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : atl.airport
State Reference	GA
Altitude	msl single value : 15500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : ztl.artcc
Operator	common carrier : air carrier
Make Model Name	Regional Jet CL65, Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : ztl.artcc
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : cfi pilot : commercial pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 200 flight time total : 7500 flight time type : 2500
ASRS Report	620305
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne critical non adherence : published procedure non adherence : required legal separation
Independent Detector	aircraft equipment : tcas
Resolutory Action	controller : issued new clearance flight crew : took precautionary avoidance action
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

During our flight from atlanta, we received and acknowledged a climb clearance from 14000 ft to 23000 ft or 24000 ft (I don't remember which). Shortly after initiating our climb, we received a TCASII TA followed by an RA (monitor vertical speed). PF leveled off while I queried ATC. There appeared to be some confusion at ATC as to our location or altitude and we were instructed to level off at 15500 ft. We were then given a frequency change. The new controller gave us a climb and we continued to destination. Soon after the conflict, we heard another flight with a similar call sign number. I believe that we were either given instructions for that flight or mistakenly answered to his instructions. We had not been warned of a similar call sign on frequency.

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Original NASA ASRS Text

Title: A CL65 FLT CREW RECEIVE A TCASII RA AFTER DEPARTING ATL AND LEVELED OFF AT 15500 FT. A QUESTION OF SIMILAR CALL SIGN RESPONSE.

Narrative: DURING OUR FLT FROM ATLANTA, WE RECEIVED AND ACKNOWLEDGED A CLB CLRNC FROM 14000 FT TO 23000 FT OR 24000 FT (I DON'T REMEMBER WHICH). SHORTLY AFTER INITIATING OUR CLB, WE RECEIVED A TCASII TA FOLLOWED BY AN RA (MONITOR VERT SPD). PF LEVELED OFF WHILE I QUERIED ATC. THERE APPEARED TO BE SOME CONFUSION AT ATC AS TO OUR LOCATION OR ALT AND WE WERE INSTRUCTED TO LEVEL OFF AT 15500 FT. WE WERE THEN GIVEN A FREQ CHANGE. THE NEW CTLR GAVE US A CLB AND WE CONTINUED TO DEST. SOON AFTER THE CONFLICT, WE HEARD ANOTHER FLT WITH A SIMILAR CALL SIGN NUMBER. I BELIEVE THAT WE WERE EITHER GIVEN INSTRUCTIONS FOR THAT FLT OR MISTAKENLY ANSWERED TO HIS INSTRUCTIONS. WE HAD NOT BEEN WARNED OF A SIMILAR CALL SIGN ON FREQ.

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.