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Less than standard separation. Air carrier crew follows TCASII RA and encounters another aircraft below them than is less than standard separation distance away.
| Attributes | |
| ACN | 303453 |
| Time | |
| Date | 199504 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : tnv |
| State Reference | TX |
| Altitude | msl bound lower : 28600 msl bound upper : 29000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zhu |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 50 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | other : unknown |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 140 flight time total : 18650 flight time type : 8000 |
| ASRS Report | 303453 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : required legal separation other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : took evasive action flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Miss Distance | vertical : 600 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Level at FL290 received a descend RA on TCASII all red from plus 6000 ft to green band minus 1200-1500 ft. Descent was per company procedures to approximately 28600 ft then received a monitor vertical rate of descent due to traffic at approximately 1 O'clock at 28000 ft which we had visually. We never saw the traffic overhead and opposite direction traffic was never a factor. However, we had less than standard separation on FL280 traffic.
Original NASA ASRS Text
Title: LTSS. ACR CREW FOLLOWS TCASII RA AND ENCOUNTERS ANOTHER ACFT BELOW THEM THAN IS LTSS DISTANCE AWAY.
Narrative: LEVEL AT FL290 RECEIVED A DSND RA ON TCASII ALL RED FROM PLUS 6000 FT TO GREEN BAND MINUS 1200-1500 FT. DSCNT WAS PER COMPANY PROCS TO APPROX 28600 FT THEN RECEIVED A MONITOR VERT RATE OF DSCNT DUE TO TFC AT APPROX 1 O'CLOCK AT 28000 FT WHICH WE HAD VISUALLY. WE NEVER SAW THE TFC OVERHEAD AND OPPOSITE DIRECTION TFC WAS NEVER A FACTOR. HOWEVER, WE HAD LTSS ON FL280 TFC.
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.