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System error occurs when traffic spacing is lost between two air carrier aircraft 102 mi west of alpoe intersection, co.
| Attributes | |
| ACN | 582516 |
| Time | |
| Date | 200305 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | intersection : alpoe |
| State Reference | CO |
| Altitude | msl bound lower : 35000 msl bound upper : 35700 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zlc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-400 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zlc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : commercial |
| Experience | flight time last 90 days : 100 flight time total : 10000 flight time type : 6000 |
| ASRS Report | 582516 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | conflict : airborne critical non adherence : clearance non adherence : published procedure non adherence : required legal separation |
| Independent Detector | aircraft equipment : tcas other controllera |
| Resolutory Action | controller : issued alert controller : issued new clearance controller : separated traffic flight crew : took evasive action |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance Airspace Structure |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Cruising FL350 after deviation around buildups and cleared direct alpoe, position 102 NM west alpoe on the 270 degree radial, and on ZLC, center gave us a 30 degree right turn and descent to FL330 followed by a call to air carrier Y to turn right 30 degrees. Immediately following this we received an RA directing a climb. We accomplished this per the airline procedures to approximately 700 ft above FL350. At this point we received a 'clear of conflict' call and notified ATC we deviated and why. ATC again directed a descent to FL330 and apologized for the RA stating 'I left you at that altitude too long.' no passenger or flight attendants noticed the RA maneuver and we proceeded to den.
Original NASA ASRS Text
Title: SYS ERROR OCCURS WHEN TFC SPACING IS LOST BTWN TWO ACR ACFT 102 MI W OF ALPOE INTXN, CO.
Narrative: CRUISING FL350 AFTER DEV AROUND BUILDUPS AND CLRED DIRECT ALPOE, POS 102 NM W ALPOE ON THE 270 DEG RADIAL, AND ON ZLC, CENTER GAVE US A 30 DEG R TURN AND DSCNT TO FL330 FOLLOWED BY A CALL TO ACR Y TO TURN R 30 DEGS. IMMEDIATELY FOLLOWING THIS WE RECEIVED AN RA DIRECTING A CLB. WE ACCOMPLISHED THIS PER THE AIRLINE PROCS TO APPROX 700 FT ABOVE FL350. AT THIS POINT WE RECEIVED A 'CLR OF CONFLICT' CALL AND NOTIFIED ATC WE DEVIATED AND WHY. ATC AGAIN DIRECTED A DSCNT TO FL330 AND APOLOGIZED FOR THE RA STATING 'I LEFT YOU AT THAT ALT TOO LONG.' NO PAX OR FLT ATTENDANTS NOTICED THE RA MANEUVER AND WE PROCEEDED TO DEN.
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.