An L1011 climbs to avoid an intruder and misses it by 100 ft vertically.

Attributes
ACN	441446
Time
Date	199906
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : fll.airport
State Reference	FL
Altitude	msl single value : 12000
Environment
Flight Conditions	IMC
Weather Elements	Thunderstorm
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zma.artcc
Operator	common carrier : air carrier
Make Model Name	L-1011 Tri-Star All Series
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : intermediate altitude
Route In Use	departure : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zma.artcc
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
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 pilot : flight engineer
Experience	flight time last 90 days : 160 flight time total : 19000 flight time type : 1500
ASRS Report	441446
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	conflict : nmac inflight encounter : weather non adherence : required legal separation
Independent Detector	aircraft equipment : tcas
Miss Distance	vertical : 100
Supplementary
Problem Areas	Weather Flight Crew Human Performance Airspace Structure ATC Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On climb out in IFR conditions, received an RA on TCASII. Complied with RA command, plus more, to avoid collision (within 100 ft). Many questions and concerns still prevail with regard to this occurrence. Callback conversation with reporter revealed the following information: conversation with the reporter indicates that he was in a left turn after departure fll to the east. There were embedded thunderstorms in front of him and he requested further deviation to the left which was approved. Shortly thereafter he received a TCASII RA which indicated an extreme descent command. The reporter began the descent, but in reference to the TCASII display, he also banked the aircraft to the right. He feels that had he not initiated the bank as well as the descent, there would have been a collision with the MD80 traffic. He surmises that the traffic was climbing out of xyz at a greater rate than his aircraft, and that both aircraft were in contact with different controllers. The incident was reported to the company and they contacted the appropriate FAA facilities.

Original NASA ASRS Text

Title: AN L1011 CLBS TO AVOID AN INTRUDER AND MISSES IT BY 100 FT VERTLY.

Narrative: ON CLBOUT IN IFR CONDITIONS, RECEIVED AN RA ON TCASII. COMPLIED WITH RA COMMAND, PLUS MORE, TO AVOID COLLISION (WITHIN 100 FT). MANY QUESTIONS AND CONCERNS STILL PREVAIL WITH REGARD TO THIS OCCURRENCE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: CONVERSATION WITH THE RPTR INDICATES THAT HE WAS IN A L TURN AFTER DEP FLL TO THE E. THERE WERE EMBEDDED TSTMS IN FRONT OF HIM AND HE REQUESTED FURTHER DEV TO THE L WHICH WAS APPROVED. SHORTLY THEREAFTER HE RECEIVED A TCASII RA WHICH INDICATED AN EXTREME DSCNT COMMAND. THE RPTR BEGAN THE DSCNT, BUT IN REF TO THE TCASII DISPLAY, HE ALSO BANKED THE ACFT TO THE R. HE FEELS THAT HAD HE NOT INITIATED THE BANK AS WELL AS THE DSCNT, THERE WOULD HAVE BEEN A COLLISION WITH THE MD80 TFC. HE SURMISES THAT THE TFC WAS CLBING OUT OF XYZ AT A GREATER RATE THAN HIS ACFT, AND THAT BOTH ACFT WERE IN CONTACT WITH DIFFERENT CTLRS. THE INCIDENT WAS RPTED TO THE COMPANY AND THEY CONTACTED THE APPROPRIATE FAA FACILITIES.

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.