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An air carrier B727 descended below the assigned altitude on a STAR. The PF failed to arm the altitude selector.
| Attributes | |
| ACN | 360431 |
| Time | |
| Date | 199702 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : oak airport : sfo |
| State Reference | CA |
| Altitude | msl bound lower : 9400 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 50 flight time total : 5500 flight time type : 1500 |
| ASRS Report | 360431 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 23000 flight time type : 2100 |
| ASRS Report | 360280 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance non adherence : published procedure |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : became reoriented flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Aircraft was descending to 10000 ft on the bsr 1 arrival into sfo. The PF forgot to arm altitude select on the autoplt, and the aircraft descended to 9400 ft before correcting. The PNF and flight engineer were distraction by a call from the cabin crew and the deviation was not discovered until the altitude warning horn sounded.
Original NASA ASRS Text
Title: AN ACR B727 DSNDED BELOW THE ASSIGNED ALT ON A STAR. THE PF FAILED TO ARM THE ALT SELECTOR.
Narrative: ACFT WAS DSNDING TO 10000 FT ON THE BSR 1 ARR INTO SFO. THE PF FORGOT TO ARM ALT SELECT ON THE AUTOPLT, AND THE ACFT DSNDED TO 9400 FT BEFORE CORRECTING. THE PNF AND FE WERE DISTR BY A CALL FROM THE CABIN CREW AND THE DEV WAS NOT DISCOVERED UNTIL THE ALT WARNING HORN SOUNDED.
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.