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When the captain of a B757-200 preset the bottom altitude of an anticipated RNAV STAR clearance he failed to ensure an appropriate VNAV mode and the aircraft began a premature descent. The first officer intervened and ATC shortly issued the anticipated clearance.
| Attributes | |
| ACN | 1187477 |
| Time | |
| Date | 201407 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | LAX.Airport |
| State Reference | CA |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Route In Use | STAR BUFIE |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Autoflight System |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Events | |
| Anomaly | Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Published Material / Policy Deviation - Procedural Clearance |
Narrative:
Captain flying descent on bufie arrival. Captain reset altitude window for descent on arrival to lowest crossing limit. Captain commanded aircraft start down early for crossing restriction with the expectation of LNAV clearance direct to sli at our request. Aircraft began descent for crossing restriction and when I noticed altitude deviation I told the captain. Captain immediately corrected the deviation. ATC issued a clearance direct sli immediately after the deviation.
Original NASA ASRS Text
Title: When the Captain of a B757-200 preset the bottom altitude of an anticipated RNAV STAR clearance he failed to ensure an appropriate VNAV mode and the aircraft began a premature descent. The First Officer intervened and ATC shortly issued the anticipated clearance.
Narrative: Captain flying descent on BUFIE arrival. Captain reset altitude window for descent on arrival to lowest crossing limit. Captain commanded aircraft start down early for crossing restriction with the expectation of LNAV clearance direct to SLI at our request. Aircraft began descent for crossing restriction and when I noticed altitude deviation I told the Captain. Captain immediately corrected the deviation. ATC issued a clearance direct SLI immediately after the deviation.
Data retrieved from NASA's ASRS site 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.