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B757 captain, thinking that the altitude capture feature of his autoplt will not capture the altitude required at bands, attempts to hasten the process with a variation of equipment procedures. He ends up overshooting his assigned altitude by 220 ft.
| Attributes | |
| ACN | 381460 |
| Time | |
| Date | 199709 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : psp |
| State Reference | CA |
| Altitude | msl bound lower : 13780 msl bound upper : 14000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | arrival other arrival star : star enroute other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 381460 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : published procedure non adherence : clearance other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
Time XA15Z, frequency 126.35, 14000 ft. ATC facility: ZLA. Location: bands intersection. Clearance to cross bands intersection at 14000 ft was issued late. Approaching bands and 14000 ft, aircraft started to level off. It appeared that we were not going to make bands intersection at 14000 ft, so after altitude capture mode, I moved the altitude alert to a lower altitude and used vertical speed. Aircraft dropped to 13780 ft before returning to 14000 ft. No further incident.
Original NASA ASRS Text
Title: B757 CAPT, THINKING THAT THE ALT CAPTURE FEATURE OF HIS AUTOPLT WILL NOT CAPTURE THE ALT REQUIRED AT BANDS, ATTEMPTS TO HASTEN THE PROCESS WITH A VARIATION OF EQUIP PROCS. HE ENDS UP OVERSHOOTING HIS ASSIGNED ALT BY 220 FT.
Narrative: TIME XA15Z, FREQ 126.35, 14000 FT. ATC FACILITY: ZLA. LOCATION: BANDS INTXN. CLRNC TO CROSS BANDS INTXN AT 14000 FT WAS ISSUED LATE. APCHING BANDS AND 14000 FT, ACFT STARTED TO LEVEL OFF. IT APPEARED THAT WE WERE NOT GOING TO MAKE BANDS INTXN AT 14000 FT, SO AFTER ALT CAPTURE MODE, I MOVED THE ALT ALERT TO A LOWER ALT AND USED VERT SPD. ACFT DROPPED TO 13780 FT BEFORE RETURNING TO 14000 FT. NO FURTHER INCIDENT.
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.