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Air carrier X had less than standard separation from aircraft Y. System error. TCASII TA RA evasive action taken.
| Attributes | |
| ACN | 185690 |
| Time | |
| Date | 199108 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : hvq |
| State Reference | WV |
| Altitude | msl bound lower : 28000 msl bound upper : 28000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 3 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | cruise other descent other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise other |
| 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 : 210 flight time total : 14000 flight time type : 4150 |
| ASRS Report | 185690 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne 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 | Other |
| Miss Distance | horizontal : 3000 vertical : 300 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X TCASII TA at 15 mi, 12:30 position 900 descending. This turned into a RA at 6 mi 500 above descending. Air carrier X was commanded verbally to descend and 1 vsi green arc was 1600 to 1900 FPM down. Commenced descent and advised ATC of RA and descent who responded with clear to descend. Clear of conflict was commanded at an altitude of FL270. A 1000 ft descent. TCAS target passed above us on TCAS scope indicating 300 ft above and about 1/4 to 1/2 mi to the right. ATC was called after clear of conflict to see if they wanted me to maintain FL270 or climb back to FL280. No answer. Called second time. Was told to standby. Called a short time later and was switched to another frequency. To me this is unacceptable. I submitted this report because of the following reasons: there is a great lack of confidence in the TCAS system with the pilot group. I was one of them but I believe this saved a mid air collision. Training standards are not set for TCAS such as mandatory simulator installation and approved operator procedures such as CAT ii and III approachs.
Original NASA ASRS Text
Title: ACR X HAD LTSS FROM ACFT Y. SYS ERROR. TCASII TA RA EVASIVE ACTION TAKEN.
Narrative: ACR X TCASII TA AT 15 MI, 12:30 POS 900 DSNDING. THIS TURNED INTO A RA AT 6 MI 500 ABOVE DSNDING. ACR X WAS COMMANDED VERBALLY TO DSND AND 1 VSI GREEN ARC WAS 1600 TO 1900 FPM DOWN. COMMENCED DSCNT AND ADVISED ATC OF RA AND DSCNT WHO RESPONDED WITH CLR TO DSND. CLR OF CONFLICT WAS COMMANDED AT AN ALT OF FL270. A 1000 FT DSCNT. TCAS TARGET PASSED ABOVE US ON TCAS SCOPE INDICATING 300 FT ABOVE AND ABOUT 1/4 TO 1/2 MI TO THE R. ATC WAS CALLED AFTER CLR OF CONFLICT TO SEE IF THEY WANTED ME TO MAINTAIN FL270 OR CLB BACK TO FL280. NO ANSWER. CALLED SECOND TIME. WAS TOLD TO STANDBY. CALLED A SHORT TIME LATER AND WAS SWITCHED TO ANOTHER FREQ. TO ME THIS IS UNACCEPTABLE. I SUBMITTED THIS RPT BECAUSE OF THE FOLLOWING REASONS: THERE IS A GREAT LACK OF CONFIDENCE IN THE TCAS SYS WITH THE PLT GROUP. I WAS ONE OF THEM BUT I BELIEVE THIS SAVED A MID AIR COLLISION. TRAINING STANDARDS ARE NOT SET FOR TCAS SUCH AS MANDATORY SIMULATOR INSTALLATION AND APPROVED OPERATOR PROCS SUCH AS CAT II AND III APCHS.
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.