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Air carrier X non adherence to ATC clearance unauthorized descent to occupied altitude. Pilot deviation altitude deviation.
| Attributes | |
| ACN | 294343 |
| Time | |
| Date | 199501 |
| Day | Tue |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | atc facility : phx |
| State Reference | AZ |
| Altitude | msl bound lower : 12000 msl bound upper : 12000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : phx tracon : cvg |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other descent other |
| Route In Use | enroute : direct enroute airway : phx |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| 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 : 240 flight time total : 20000 flight time type : 10000 |
| ASRS Report | 294343 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 250 flight time total : 7500 flight time type : 3200 |
| ASRS Report | 293846 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : required legal separation |
| Independent Detector | other other : unspecified atc |
| Resolutory Action | none taken : detected after the fact |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 1500 vertical : 800 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Air carrier X cleared to 12000 ft and leveled at same. Center says they called traffic at 10 O'clock and 11000 ft, which we acknowledged. We then descended to 11000 ft without clearance. Neither center nor approach indicated to us that there was a problem. I can only assume that aircraft took the traffic as a clearance to 11000 ft, rather than a TA. In short, misunderstood the call and reacted to same. This is an assumption, since we have no solid recollection of the events. I also think the first officer was off getting the updated WX so 1) he was out of the loop, and 2) I was flying single pilot in the WX.
Original NASA ASRS Text
Title: ACR X NON ADHERENCE TO ATC CLRNC UNAUTH DSCNT TO OCCUPIED ALT. PLTDEV ALTDEV.
Narrative: ACR X CLRED TO 12000 FT AND LEVELED AT SAME. CTR SAYS THEY CALLED TFC AT 10 O'CLOCK AND 11000 FT, WHICH WE ACKNOWLEDGED. WE THEN DSNDED TO 11000 FT WITHOUT CLRNC. NEITHER CTR NOR APCH INDICATED TO US THAT THERE WAS A PROB. I CAN ONLY ASSUME THAT ACFT TOOK THE TFC AS A CLRNC TO 11000 FT, RATHER THAN A TA. IN SHORT, MISUNDERSTOOD THE CALL AND REACTED TO SAME. THIS IS AN ASSUMPTION, SINCE WE HAVE NO SOLID RECOLLECTION OF THE EVENTS. I ALSO THINK THE FO WAS OFF GETTING THE UPDATED WX SO 1) HE WAS OUT OF THE LOOP, AND 2) I WAS FLYING SINGLE PLT IN THE WX.
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.