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En route wbound at FL390, south of cnx VORTAC, receiving a TCASII TA and RA, a B777 flight crew take precautionary action observing a same altitude B-52 in a turn within 3 mi.
| Attributes | |
| ACN | 615252 |
| Time | |
| Date | 200404 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : cnx.vortac |
| State Reference | NM |
| Altitude | msl single value : 39000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zab.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B777 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | other |
| Make Model Name | Stratofortress (B-52) |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 615252 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | airspace violation : exit conflict : airborne critical non adherence : clearance non adherence : required legal separation non adherence : published procedure other spatial deviation |
| Independent Detector | aircraft equipment : tcas other flight crewa |
| Resolutory Action | flight crew : took evasive action flight crew : overrode automation |
| Consequence | faa : investigated faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 17500 vertical : 0 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
At approximately 65 mi east of cnx, while flying at FL390, I received a TA shortly followed by an RA to descend. The traffic, a B-52, was visible at 10 O'clock position and in a hard right turn at our altitude. The RA only gave 2 descend commands then went silent. I initially disconnected the autoplt. However, after analyzing the threat, I elected not to descend. The B-52 got within 3 mi. I contacted ZAB to report the incident. I also called ZAB once I got to lax to discuss the event with a supervisor. I was told the crew of the B-52 turned off their transponder during the event.
Original NASA ASRS Text
Title: ENRTE WBOUND AT FL390, S OF CNX VORTAC, RECEIVING A TCASII TA AND RA, A B777 FLT CREW TAKE PRECAUTIONARY ACTION OBSERVING A SAME ALT B-52 IN A TURN WITHIN 3 MI.
Narrative: AT APPROX 65 MI E OF CNX, WHILE FLYING AT FL390, I RECEIVED A TA SHORTLY FOLLOWED BY AN RA TO DSND. THE TFC, A B-52, WAS VISIBLE AT 10 O'CLOCK POS AND IN A HARD R TURN AT OUR ALT. THE RA ONLY GAVE 2 DSND COMMANDS THEN WENT SILENT. I INITIALLY DISCONNECTED THE AUTOPLT. HOWEVER, AFTER ANALYZING THE THREAT, I ELECTED NOT TO DSND. THE B-52 GOT WITHIN 3 MI. I CONTACTED ZAB TO RPT THE INCIDENT. I ALSO CALLED ZAB ONCE I GOT TO LAX TO DISCUSS THE EVENT WITH A SUPVR. I WAS TOLD THE CREW OF THE B-52 TURNED OFF THEIR XPONDER DURING THE EVENT.
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.