A B737 crew reported taking evasive action following a TCAS RA at FL340. The traffic was seen passin...

Attributes
ACN	900480
Time
Date	201007
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Not Flying First Officer
Events
Anomaly	Conflict Airborne Conflict

Narrative:

[We were] in level westbound cruise flight at FL340. A TCAS TA annunciation occurred followed by an RA to descend. An eastbound target appeared to be above our altitude and in turn to the left. Autopilot was disconnected and the TCAS avoidance guidance command was followed. Vertical separation was roughly 600 ft and lateral separation was estimated to be less than 1/4 mile. After TCAS 'clear of conflict' was issued; returned to FL340. Remainder of flight was normal.

Original NASA ASRS Text

Title: A B737 crew reported taking evasive action following a TCAS RA at FL340. The traffic was seen passing within 600 FT vertically and a quarter mile horizontally in a turn.

Narrative: [We were] in level westbound cruise flight at FL340. A TCAS TA annunciation occurred followed by an RA to descend. An eastbound target appeared to be above our altitude and in turn to the left. Autopilot was disconnected and the TCAS avoidance guidance command was followed. Vertical separation was roughly 600 FT and lateral separation was estimated to be less than 1/4 mile. After TCAS 'clear of conflict' was issued; returned to FL340. Remainder of flight was normal.

Data retrieved from NASA's ASRS site as of April 2012 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.

A B737 crew reported taking evasive action following a TCAS RA at FL340. The traffic was seen passing within 600 ft vertically and a quarter mile horizontally in a turn.