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A B737-500 at FL340 had a TCAS RA event with an aircraft at FL332 climbing in mountain wave conditions.
| Attributes | |
| ACN | 729525 |
| Time | |
| Date | 200703 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : als.airport |
| State Reference | CO |
| Altitude | msl single value : 34000 |
| Aircraft 1 | |
| Controlling Facilities | artcc : zab.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-500 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zab.artcc |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise : level |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain observation : company check pilot oversight : pic |
| Experience | flight time last 90 days : 221 flight time total : 10088 flight time type : 3686 |
| ASRS Report | 729525 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | conflict : airborne less severe inflight encounter other |
| Independent Detector | aircraft equipment : tcas |
| Resolutory Action | flight crew : took evasive action flight crew : took precautionary avoidance action |
| Supplementary | |
| Problem Areas | Weather Environmental Factor |
| Primary Problem | Weather |
Narrative:
In level cruise at FL340 received TCAS alert followed by TCAS climb RA for an aircraft below us at FL332 and climbing. Copilot disconnected autoplt and autothrottle and began to climb; I advised ATC that we were climbing in response to RA. At FL342 warning ended; we advised ATC and returned to FL340. After event noticed aircraft at FL330 continuing to climb and descend from FL333 to FL330. Mountain wave conditions were present.
Original NASA ASRS Text
Title: A B737-500 AT FL340 HAD A TCAS RA EVENT WITH AN ACFT AT FL332 CLBING IN MOUNTAIN WAVE CONDITIONS.
Narrative: IN LEVEL CRUISE AT FL340 RECEIVED TCAS ALERT FOLLOWED BY TCAS CLIMB RA FOR AN AIRCRAFT BELOW US AT FL332 AND CLIMBING. COPILOT DISCONNECTED AUTOPLT AND AUTOTHROTTLE AND BEGAN TO CLIMB; I ADVISED ATC THAT WE WERE CLIMBING IN RESPONSE TO RA. AT FL342 WARNING ENDED; WE ADVISED ATC AND RETURNED TO FL340. AFTER EVENT NOTICED ACFT AT FL330 CONTINUING TO CLIMB AND DESCEND FROM FL333 TO FL330. MOUNTAIN WAVE CONDITIONS WERE PRESENT.
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.