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An air carrier flight crew engages the approach mode prematurely and descends below the hunda crossing altitude while following the GS.
| Attributes | |
| ACN | 344750 |
| Time | |
| Date | 199608 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : lax |
| State Reference | CA |
| Altitude | msl bound lower : 3300 msl bound upper : 3500 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Dawn |
| Aircraft 1 | |
| Controlling Facilities | tracon : lax |
| 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 : approach descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 230 flight time total : 17500 flight time type : 10400 |
| ASRS Report | 344750 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 7000 flight time type : 2500 |
| ASRS Report | 344749 |
| Events | |
| Anomaly | altitude deviation : crossing restriction not met non adherence : published procedure non adherence : far non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
I was flying the ILS to runway 25L at lax. I went to approach mode and aircraft captured the GS and descended to 3300 ft about 1 mi east of hunda intersection which is 200 ft below the published altitude. This happened because I selected approach mode too early and aircraft was flying GS which will take you below the published altitude east of hunda intersection which is 3500 ft until 12.2 mi.
Original NASA ASRS Text
Title: AN ACR FLC ENGAGES THE APCH MODE PREMATURELY AND DSNDS BELOW THE HUNDA XING ALT WHILE FOLLOWING THE GS.
Narrative: I WAS FLYING THE ILS TO RWY 25L AT LAX. I WENT TO APCH MODE AND ACFT CAPTURED THE GS AND DSNDED TO 3300 FT ABOUT 1 MI E OF HUNDA INTXN WHICH IS 200 FT BELOW THE PUBLISHED ALT. THIS HAPPENED BECAUSE I SELECTED APCH MODE TOO EARLY AND ACFT WAS FLYING GS WHICH WILL TAKE YOU BELOW THE PUBLISHED ALT E OF HUNDA INTXN WHICH IS 3500 FT UNTIL 12.2 MI.
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.