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Flight crew of an medium large transport descended from assigned altitude prior to ATC clearance due to a misunderstanding of the term 'expect!'
| Attributes | |
| ACN | 332004 |
| Time | |
| Date | 199603 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : slc |
| State Reference | UT |
| Altitude | msl bound lower : 14000 msl bound upper : 14000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Route In Use | arrival other arrival star : star enroute airway : zlc |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 260 flight time total : 10000 flight time type : 6500 |
| ASRS Report | 332004 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | non adherence : published procedure other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
ATC issued clearance 'descend via jammn 1 arrival landing north.' aircraft crew unsure of altitudes cleared to, ie, ok to descend to cross jammn at 14000 ft, then does this clearance extend to follow descent to 10000 ft at parre? Crew initiated descent per this instruction.
Original NASA ASRS Text
Title: FLC OF AN MLG DSNDED FROM ASSIGNED ALT PRIOR TO ATC CLRNC DUE TO A MISUNDERSTANDING OF THE TERM 'EXPECT!'
Narrative: ATC ISSUED CLRNC 'DSND VIA JAMMN 1 ARR LNDG N.' ACFT CREW UNSURE OF ALTS CLRED TO, IE, OK TO DSND TO CROSS JAMMN AT 14000 FT, THEN DOES THIS CLRNC EXTEND TO FOLLOW DSCNT TO 10000 FT AT PARRE? CREW INITIATED DSCNT PER THIS INSTRUCTION.
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.