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The reporter was flying with a relatively new first officer who was on the company frequency approaching lax. Center assigned 320 KTS when able. Maintained speed and entered 12000 ft in altitude preselect. The reporter lost track of altitude and descended below 12000 ft 4 mi prematurely when switching from center to approach and accepting speed restr of 250 KTS at arnes.
| Attributes | |
| ACN | 334000 |
| Time | |
| Date | 199604 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : lax |
| State Reference | CA |
| Altitude | msl bound lower : 11500 msl bound upper : 12000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | arrival other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 200 flight time total : 8000 flight time type : 3000 |
| ASRS Report | 334000 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | altitude deviation : crossing restriction not met altitude deviation : overshoot non adherence : published procedure non adherence : clearance |
| 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 |
Narrative:
Flying with relatively new first officer, he was on company frequency approaching destination, lax. Center assigned 320 KTS when able, maintained speed and entered 12000 ft in altitude preselect, civet inbound. Lost track of altitude and descended below 12000 ft, 4 mi prematurely when switching from center to approach and accepting speed restr of 250 KTS at arnes. Don't know why altitude failed to capture and hold. Must have selected a different pitch command or rate on the flight guidance system. Have always considered the civet arrival challenging -- made more so by the speed assignments and traffic. Will now ensure that both pilots are 'in the loop' during this procedure. Thousand ft calls, flight monitoring, and ATC communication handled by the PNF would have probably prevented this altitude deviation.
Original NASA ASRS Text
Title: THE RPTR WAS FLYING WITH A RELATIVELY NEW FO WHO WAS ON THE COMPANY FREQ APCHING LAX. CTR ASSIGNED 320 KTS WHEN ABLE. MAINTAINED SPD AND ENTERED 12000 FT IN ALT PRESELECT. THE RPTR LOST TRACK OF ALT AND DSNDED BELOW 12000 FT 4 MI PREMATURELY WHEN SWITCHING FROM CTR TO APCH AND ACCEPTING SPD RESTR OF 250 KTS AT ARNES.
Narrative: FLYING WITH RELATIVELY NEW FO, HE WAS ON COMPANY FREQ APCHING DEST, LAX. CTR ASSIGNED 320 KTS WHEN ABLE, MAINTAINED SPD AND ENTERED 12000 FT IN ALT PRESELECT, CIVET INBOUND. LOST TRACK OF ALT AND DSNDED BELOW 12000 FT, 4 MI PREMATURELY WHEN SWITCHING FROM CTR TO APCH AND ACCEPTING SPD RESTR OF 250 KTS AT ARNES. DON'T KNOW WHY ALT FAILED TO CAPTURE AND HOLD. MUST HAVE SELECTED A DIFFERENT PITCH COMMAND OR RATE ON THE FLT GUIDANCE SYS. HAVE ALWAYS CONSIDERED THE CIVET ARR CHALLENGING -- MADE MORE SO BY THE SPD ASSIGNMENTS AND TFC. WILL NOW ENSURE THAT BOTH PLTS ARE 'IN THE LOOP' DURING THIS PROC. THOUSAND FT CALLS, FLT MONITORING, AND ATC COM HANDLED BY THE PNF WOULD HAVE PROBABLY PREVENTED THIS ALTDEV.
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.