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Air carrier TCASII TA. Non adherence to ATC clearance, had less than standard separation from B737. Pilot deviation. System error.
| Attributes | |
| ACN | 295780 |
| Time | |
| Date | 199502 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : pmd |
| State Reference | CA |
| Altitude | msl bound lower : 21000 msl bound upper : 21000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| 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 : 225 flight time total : 17000 flight time type : 225 |
| ASRS Report | 295780 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 8500 |
| ASRS Report | 295571 |
| Events | |
| Anomaly | altitude deviation : undershoot conflict : airborne less severe non adherence : published procedure non adherence : clearance non adherence : required legal separation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 6000 vertical : 600 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation Operational Error |
Narrative:
Cleared to descend from FL220 to FL200 by center. Passing FL210 had TA on TCASII which slowed traffic at 12 O'clock and minus 9. PF slowed rate of descent and leveled at FL205. Looking outside I saw another aircraft ahead and slightly right and a little higher than us. We looked back at TCASII and the lower target was gone. We again initiated descent and was at about FL203 or FL204 when the aircraft passed us on the right. He was at FL210. Supplemental information from acn 295571: level at FL220, light chop, center approved descent to FL200. At FL208 a TCASII advisory sounding, showing a target at our 12 O'clock and 5 mi (yellow with a minus 900) climbing. I clicked the autoplt off and slowed the rate of descent. At FL205 TCASII now showed target 12 O'clock 2 mi and now indicated plus 500 ft level. At the same time we had visual on the traffic, a 737 then had visual on us.
Original NASA ASRS Text
Title: ACR TCASII TA. NON ADHERENCE TO ATC CLRNC, HAD LTSS FROM B737. PLTDEV. SYS ERROR.
Narrative: CLRED TO DSND FROM FL220 TO FL200 BY CTR. PASSING FL210 HAD TA ON TCASII WHICH SLOWED TFC AT 12 O'CLOCK AND MINUS 9. PF SLOWED RATE OF DSCNT AND LEVELED AT FL205. LOOKING OUTSIDE I SAW ANOTHER ACFT AHEAD AND SLIGHTLY R AND A LITTLE HIGHER THAN US. WE LOOKED BACK AT TCASII AND THE LOWER TARGET WAS GONE. WE AGAIN INITIATED DSCNT AND WAS AT ABOUT FL203 OR FL204 WHEN THE ACFT PASSED US ON THE R. HE WAS AT FL210. SUPPLEMENTAL INFO FROM ACN 295571: LEVEL AT FL220, LIGHT CHOP, CTR APPROVED DSCNT TO FL200. AT FL208 A TCASII ADVISORY SOUNDING, SHOWING A TARGET AT OUR 12 O'CLOCK AND 5 MI (YELLOW WITH A MINUS 900) CLBING. I CLICKED THE AUTOPLT OFF AND SLOWED THE RATE OF DSCNT. AT FL205 TCASII NOW SHOWED TARGET 12 O'CLOCK 2 MI AND NOW INDICATED PLUS 500 FT LEVEL. AT THE SAME TIME WE HAD VISUAL ON THE TFC, A 737 THEN HAD VISUAL ON US.
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.