<< >> NASA ASRS Report 221110, September 1992

2 aircraft, same company departed in sequence. When handed off clearance were mixed up and TCASII alert occurred.

Attributes
ACN	221110
Time
Date	199209
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : atl
State Reference	GA
Altitude	msl bound lower : 16700 msl bound upper : 17000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : ztl tower : fnt
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : flight engineer pilot : commercial pilot : atp
Experience	flight time last 90 days : 200 flight time total : 12000 flight time type : 2500
ASRS Report	221110
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : atp pilot : commercial
Events
Anomaly	conflict : airborne less severe non adherence : published procedure other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

We departed 8R-atl. Departure control cleared us to 14000 and 270 vector. Company abc departed 8R-atl behind us and departure control (125.7) cleared abc to 17000 ft and 270 degree vector. Both aircraft were then cleared to atl center 134.95. We were cleared to 17000 ft. I asked the first officer to verify our clearance to 17000 and aircraft separation. At 16300 we had a TCASII conflict. We leveled at 16700 while trying to get ZTL. ZTL instructed us to descend to 16000 ft and abc to climb to FL230. Both radio monitoring and TCASII prevented a possible mid air.

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Original NASA ASRS Text

Title: 2 ACFT, SAME COMPANY DEPARTED IN SEQUENCE. WHEN HANDED OFF CLRNC WERE MIXED UP AND TCASII ALERT OCCURRED.

Narrative: WE DEPARTED 8R-ATL. DEP CTL CLRED US TO 14000 AND 270 VECTOR. COMPANY ABC DEPARTED 8R-ATL BEHIND US AND DEP CTL (125.7) CLRED ABC TO 17000 FT AND 270 DEG VECTOR. BOTH ACFT WERE THEN CLRED TO ATL CTR 134.95. WE WERE CLRED TO 17000 FT. I ASKED THE FO TO VERIFY OUR CLRNC TO 17000 AND ACFT SEPARATION. AT 16300 WE HAD A TCASII CONFLICT. WE LEVELED AT 16700 WHILE TRYING TO GET ZTL. ZTL INSTRUCTED US TO DSND TO 16000 FT AND ABC TO CLB TO FL230. BOTH RADIO MONITORING AND TCASII PREVENTED A POSSIBLE MID AIR.

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.