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Zan controller described incident when aircraft started descent to FL210 when only cleared to FL310 and entered adjacent airspace without clearance.
| Attributes | |
| ACN | 700598 |
| Time | |
| Date | 200606 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : bet.airport |
| State Reference | AK |
| Altitude | msl bound lower : 26000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zan.artcc tower : atl.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B747-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller time certified in position2 : 1 |
| ASRS Report | 700598 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller military : 4 controller radar : 14 |
| ASRS Report | 700785 |
| Events | |
| Anomaly | airspace violation : entry non adherence : clearance non adherence : required legal separation |
| Independent Detector | other controllera other controllerb |
| Resolutory Action | none taken : detected after the fact |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Descended air carrier X to FL310. I noticed aircraft descending through FL280. I immediately climbed aircraft back to FL310 and d-side pointed out the aircraft to sector 13. Supplemental information from acn 700785: the r-side noticed the aircraft at FL270 descending. The r-side questioned the aircraft who thought the clearance was FL210. The aircraft then climbed to FL310. Leaving FL290; descending; the aircraft violated the sector below.
Original NASA ASRS Text
Title: ZAN CTLR DESCRIBED INCIDENT WHEN ACFT STARTED DSCNT TO FL210 WHEN ONLY CLRED TO FL310 AND ENTERED ADJACENT AIRSPACE WITHOUT CLRNC.
Narrative: DSNDED ACR X TO FL310. I NOTICED ACFT DSNDING THROUGH FL280. I IMMEDIATELY CLBED ACFT BACK TO FL310 AND D-SIDE POINTED OUT THE ACFT TO SECTOR 13. SUPPLEMENTAL INFO FROM ACN 700785: THE R-SIDE NOTICED THE ACFT AT FL270 DSNDING. THE R-SIDE QUESTIONED THE ACFT WHO THOUGHT THE CLRNC WAS FL210. THE ACFT THEN CLBED TO FL310. LEAVING FL290; DSNDING; THE ACFT VIOLATED THE SECTOR BELOW.
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.