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B777 crew let the FMS VNAV descent profile go 500 ft low on the civet 4 STAR into lax.
| Attributes | |
| ACN | 530841 |
| Time | |
| Date | 200111 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | intersection : bremr |
| State Reference | CA |
| Altitude | msl bound lower : 11500 msl bound upper : 12000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : sct.tracon tower : clt.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B777 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : intermediate altitude |
| Route In Use | arrival star : civet4 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial pilot : atp pilot : multi engine |
| Experience | flight time last 90 days : 150 flight time total : 5500 flight time type : 600 |
| ASRS Report | 530841 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | altitude deviation : crossing restriction not met altitude deviation : overshoot non adherence : published procedure non adherence : far non adherence : company policies non adherence : clearance other anomaly other |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : returned to assigned altitude none taken : detected after the fact |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On civet 4 arrival into lax. Between civet and bremr intersection on VNAV descent, the aircraft continued below 12000 ft prior to bremr intersection. The aircraft was flown manually back to 12000 ft and crossed bremr intersection at 12000 ft. The restr of 12000 ft or above at bremr was complied with. The aircraft reached approximately 11500 ft prior to manually flying back to 12000 ft for crossing restr. Cause: VNAV descent did not have bremr as a hard altitude crossing restr after the initial input of FMS arrival contained restr. Unknown reason for change.
Original NASA ASRS Text
Title: B777 CREW LET THE FMS VNAV DESCENT PROFILE GO 500 FT LOW ON THE CIVET 4 STAR INTO LAX.
Narrative: ON CIVET 4 ARR INTO LAX. BETWEEN CIVET AND BREMR INTERSECTION ON VNAV DESCENT, THE ACFT CONTINUED BELOW 12000 FT PRIOR TO BREMR INTERSECTION. THE ACFT WAS FLOWN MANUALLY BACK TO 12000 FT AND CROSSED BREMR INTERSECTION AT 12000 FT. THE RESTR OF 12000 FT OR ABOVE AT BREMR WAS COMPLIED WITH. THE ACFT REACHED APPROX 11500 FT PRIOR TO MANUALLY FLYING BACK TO 12000 FT FOR CROSSING RESTR. CAUSE: VNAV DESCENT DID NOT HAVE BREMR AS A HARD ALTITUDE CROSSING RESTR AFTER THE INITIAL INPUT OF FMS ARRIVAL CONTAINED RESTR. UNKNOWN REASON FOR CHANGE.
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.