 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
A320 flight crew reports descending below the fuelr crossing restriction on the ILS 25L approach to lax when the aircraft transitions to approach mode from LNAV/VNAV without the crew noticing. The crew detects the error and the remainder of the restrictions are met.
| Attributes | |
| ACN | 1125547 |
| Time | |
| Date | 201310 |
| Place | |
| Locale Reference | SCT.TRACON |
| State Reference | CA |
| Environment | |
| Flight Conditions | IMC |
| Aircraft 1 | |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Final Approach |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | FMS/FMC |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 200 Flight Crew Total 24000 Flight Crew Type 8000 |
| Person 2 | |
| Function | Pilot Not Flying First Officer |
| Experience | Flight Crew Last 90 Days 180 Flight Crew Total 13300 Flight Crew Type 7521 |
| Events | |
| Anomaly | Deviation - Altitude Crossing Restriction Not Met Deviation - Altitude Overshoot Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy |
Narrative:
Setting the lowest published altitude on an arrival/approach makes for a very nice descent when all is going well. ATC provided many speed assignments to 'keep our speed up.' while transitioning from a managed descent to the approach mode; we briefly failed to observe the subtle changes to the FMA's that indicated a mode reversion to our VNAV profile. It would be helpful to have a more noticeable and audible alert when a reversion occurs.
Original NASA ASRS Text
Title: A320 flight crew reports descending below the FUELR crossing restriction on the ILS 25L approach to LAX when the aircraft transitions to approach mode from LNAV/VNAV without the crew noticing. The crew detects the error and the remainder of the restrictions are met.
Narrative: Setting the lowest published altitude on an arrival/approach makes for a very nice descent when all is going well. ATC provided many speed assignments to 'keep our speed up.' While transitioning from a managed descent to the approach mode; we briefly failed to observe the subtle changes to the FMA's that indicated a mode reversion to our VNAV profile. It would be helpful to have a more noticeable and audible alert when a reversion occurs.
Data retrieved from NASA's ASRS site as of July 2013 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.