DC9 flight crew experiences near midair collision.

Attributes
ACN	675575
Time
Date	200510
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : bna.airport
State Reference	TN
Altitude	msl single value : 33000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zme.artcc
Operator	common carrier : air carrier
Make Model Name	DC-9 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zme.artcc
Operator	common carrier : air carrier
Make Model Name	Other
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 140 flight time total : 16000 flight time type : 10000
ASRS Report	675575
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
ASRS Report	675576
Events
Anomaly	conflict : nmac non adherence : clearance
Independent Detector	aircraft equipment : tcas other flight crewa
Resolutory Action	controller : issued advisory flight crew : took evasive action
Miss Distance	horizontal : 0 vertical : 150
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft ATC Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I noticed traffic at approximately my 9 O'clock position. It appeared he was near our altitude and coming at us. I then checked the TCAS just as he was coming on the screen and noted he was in a descent; 800 ft above us. I told the first officer to call center and ask about traffic and center hollered at him. He was supposed to be at FL340. I told the first officer to prepare for a possible conflict. Immediately after I spoke; we got a traffic alert and we immediately got 'climb; climb.' I performed the avoidance maneuver and as best I could tell; we missed him by no more than 100-200 ft as indicated by the TCAS presentation.

Original NASA ASRS Text

Title: DC9 FLT CREW EXPERIENCES NMAC.

Narrative: I NOTICED TFC AT APPROX MY 9 O'CLOCK POS. IT APPEARED HE WAS NEAR OUR ALT AND COMING AT US. I THEN CHKED THE TCAS JUST AS HE WAS COMING ON THE SCREEN AND NOTED HE WAS IN A DSCNT; 800 FT ABOVE US. I TOLD THE FO TO CALL CTR AND ASK ABOUT TFC AND CTR HOLLERED AT HIM. HE WAS SUPPOSED TO BE AT FL340. I TOLD THE FO TO PREPARE FOR A POSSIBLE CONFLICT. IMMEDIATELY AFTER I SPOKE; WE GOT A TFC ALERT AND WE IMMEDIATELY GOT 'CLB; CLB.' I PERFORMED THE AVOIDANCE MANEUVER AND AS BEST I COULD TELL; WE MISSED HIM BY NO MORE THAN 100-200 FT AS INDICATED BY THE TCAS PRESENTATION.

Data retrieved from NASA's ASRS site as of January 2009 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.