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An air carrier captain reported that the first officer over-relied on the automation, causing a speed deviation in sct airspace.
| Attributes | |
| ACN | 518580 |
| Time | |
| Date | 200107 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : lax.airport |
| State Reference | CA |
| Altitude | msl bound lower : 7500 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent : intermediate altitude |
| Route In Use | arrival : profile descent |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 11000 flight time type : 500 |
| ASRS Report | 518580 |
| Events | |
| Anomaly | non adherence : far non adherence : published procedure non adherence : company policies other anomaly |
| Resolutory Action | aircraft : automation overrode flight crew |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
The first officer was flying the arrival into los angeles airport. Socal approach cleared us from 11000 ft to descend to 6000 ft. The aircraft was on autoplt, flying in a vertical navigation (VNAV) mode. I told the first officer that I would be off the approach frequency, so I could talk to company. I was off frequency for about 3 mins. When I got back on socal, I looked up to see that we had a VNAV disconnect. I told the first officer and then looked at our airspeed, we were at 265 KTS passing 8500 ft. I told the first officer we needed to slow down and to put the speed brakes out. The first officer put them out, but we had a 3100 ft vertical descent going. I told him to reduce the vertical speed so we could slow down. Passing 7500 ft, we finally started to slow down. But, we ended up at 275 KTS at 7500 ft. Corrective actions: talk to company before top of descent, so both pilots can monitor. Do not rely on automation. You must know what to do if the automation is not working correctly.
Original NASA ASRS Text
Title: AN ACR CAPT RPTED THAT THE FO OVER-RELIED ON THE AUTOMATION, CAUSING A SPD DEV IN SCT AIRSPACE.
Narrative: THE FO WAS FLYING THE ARR INTO LOS ANGELES ARPT. SOCAL APCH CLRED US FROM 11000 FT TO DSND TO 6000 FT. THE ACFT WAS ON AUTOPLT, FLYING IN A VERT NAV (VNAV) MODE. I TOLD THE FO THAT I WOULD BE OFF THE APCH FREQ, SO I COULD TALK TO COMPANY. I WAS OFF FREQ FOR ABOUT 3 MINS. WHEN I GOT BACK ON SOCAL, I LOOKED UP TO SEE THAT WE HAD A VNAV DISCONNECT. I TOLD THE FO AND THEN LOOKED AT OUR AIRSPD, WE WERE AT 265 KTS PASSING 8500 FT. I TOLD THE FO WE NEEDED TO SLOW DOWN AND TO PUT THE SPD BRAKES OUT. THE FO PUT THEM OUT, BUT WE HAD A 3100 FT VERT DSCNT GOING. I TOLD HIM TO REDUCE THE VERT SPD SO WE COULD SLOW DOWN. PASSING 7500 FT, WE FINALLY STARTED TO SLOW DOWN. BUT, WE ENDED UP AT 275 KTS AT 7500 FT. CORRECTIVE ACTIONS: TALK TO COMPANY BEFORE TOP OF DSCNT, SO BOTH PLTS CAN MONITOR. DO NOT RELY ON AUTOMATION. YOU MUST KNOW WHAT TO DO IF THE AUTOMATION IS NOT WORKING CORRECTLY.
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.