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Air carrier Y climb through occupied altitude had less than standard separation from air carrier X TCASII RA climb. System error.
| Attributes | |
| ACN | 315224 |
| Time | |
| Date | 199509 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : bam |
| State Reference | NV |
| Altitude | msl bound lower : 35000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zlc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 80 flight time total : 14000 flight time type : 2500 |
| ASRS Report | 315224 |
| 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 : ground less severe non adherence : clearance non adherence : published procedure non adherence : required legal separation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 2000 vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Pilot Deviation Operational Error |
Narrative:
Air carrier X cruising at FL350, 40 mi east of bam, noticed aircraft on TCASII at 30 mi out opposite direction. Switched to 20 mi scale, went white to yellow then red. Aircraft was climbing through FL340. TCASII alert went off and I started climbing in compliance. Center then gave us a 40 degree right turn. We climbed to 35400 ft or 35500 ft and I saw a B727 off to left and below us. I believe this was air carrier Y and he was climbing to FL370. This was close and totally prevented by TCASII. Center cleared this guy to be at FL370 by a certain time. Someone messed up.
Original NASA ASRS Text
Title: ACR Y CLB THROUGH OCCUPIED ALT HAD LTSS FROM ACR X TCASII RA CLB. SYS ERROR.
Narrative: ACR X CRUISING AT FL350, 40 MI E OF BAM, NOTICED ACFT ON TCASII AT 30 MI OUT OPPOSITE DIRECTION. SWITCHED TO 20 MI SCALE, WENT WHITE TO YELLOW THEN RED. ACFT WAS CLBING THROUGH FL340. TCASII ALERT WENT OFF AND I STARTED CLBING IN COMPLIANCE. CTR THEN GAVE US A 40 DEG R TURN. WE CLBED TO 35400 FT OR 35500 FT AND I SAW A B727 OFF TO L AND BELOW US. I BELIEVE THIS WAS ACR Y AND HE WAS CLBING TO FL370. THIS WAS CLOSE AND TOTALLY PREVENTED BY TCASII. CTR CLRED THIS GUY TO BE AT FL370 BY A CERTAIN TIME. SOMEONE MESSED UP.
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.