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ZBW controller experienced operational error at FL180 when incorrect crossing altitude was missed and aircraft conflicted with converging traffic.
| Attributes | |
| ACN | 706681 |
| Time | |
| Date | 200608 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : vny.vor |
| State Reference | NY |
| Altitude | msl single value : 18000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zbw.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar controller : non radar controller : military |
| Experience | controller military : 11 controller non radar : 2 controller radar : 13 controller supervisory : 5 |
| ASRS Report | 706681 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert aircraft equipment : tcas other controllera |
| Resolutory Action | controller : issued alert controller : issued new clearance flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 7800 vertical : 500 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Hearback readback error. Air carrier X issued a clearance to cross 10 mi south of delancy at and maintain FL190. Air carrier X read back FL180 and was not caught. This led to the air carrier X in conflict with air carrier Y both at FL180 converging. TCAS RA appeared to work as air carrier X continued to descend and air carrier Y climbed to avoid conflict.
Original NASA ASRS Text
Title: ZBW CTLR EXPERIENCED OPERROR AT FL180 WHEN INCORRECT XING ALT WAS MISSED AND ACFT CONFLICTED WITH CONVERGING TFC.
Narrative: HEARBACK READBACK ERROR. ACR X ISSUED A CLRNC TO CROSS 10 MI S OF DELANCY AT AND MAINTAIN FL190. ACR X READ BACK FL180 AND WAS NOT CAUGHT. THIS LED TO THE ACR X IN CONFLICT WITH ACR Y BOTH AT FL180 CONVERGING. TCAS RA APPEARED TO WORK AS ACR X CONTINUED TO DSND AND ACR Y CLBED TO AVOID CONFLICT.
Data retrieved from NASA's ASRS site as of January 2009 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.