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An A319 crew in ZBW airspace believed they were cleared to leave FL330 for FL230 and conflicted with an LJ35 climbing to FL310.
| Attributes | |
| ACN | 477211 |
| Time | |
| Date | 200006 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | navaid : gdm.vortac |
| State Reference | MA |
| Altitude | msl single value : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw.artcc tower : teb.tower |
| Operator | common carrier : air carrier |
| Make Model Name | A319 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zbw.artcc |
| Operator | general aviation : personal |
| Make Model Name | Learjet 35 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : vacating altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 17 |
| ASRS Report | 477211 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance |
| Independent Detector | atc equipment : conflict alert aircraft equipment : tcas |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action none taken : detected after the fact |
| Miss Distance | horizontal : 25200 vertical : 1100 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Air carrier X was level at FL330. Aircraft Y was climbing to FL310. Air carrier X descended to FL230 in error, and was climbed back to FL330. Aircraft Y was issued an evasive descent to FL290.
Original NASA ASRS Text
Title: AN A319 CREW IN ZBW AIRSPACE BELIEVED THEY WERE CLRED TO LEAVE FL330 FOR FL230 AND CONFLICTED WITH AN LJ35 CLBING TO FL310.
Narrative: ACR X WAS LEVEL AT FL330. ACFT Y WAS CLBING TO FL310. ACR X DSNDED TO FL230 IN ERROR, AND WAS CLBED BACK TO FL330. ACFT Y WAS ISSUED AN EVASIVE DSCNT TO FL290.
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.