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The flight crew was forced to intervene manually when the autoflight system failed to meet the crossing restrictions at dasac and clark on the ltown STAR to mem.
| Attributes | |
| ACN | 1040131 |
| Time | |
| Date | 201209 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | MEM.Airport |
| State Reference | TN |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Route In Use | STAR LTOWN6 |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Autoflight System |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Deviation - Altitude Excursion From Assigned Altitude Deviation - Altitude Crossing Restriction Not Met Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Deviation - Speed All Types |
Narrative:
While descending via the LTOWN6 arrival landing north transition; the FMS was having difficulty complying with the 210 KTS at dasac restriction. The speed had increased to 225 KTS. Distracted by the airspeed constraint; I noticed that we had descended below the 8;000 ft restriction at clark intersection by 500 ft about a mile prior to clark. I brought this to the attention of the pilot flying and a correction was made to comply with the restriction.
Original NASA ASRS Text
Title: The flight crew was forced to intervene manually when the autoflight system failed to meet the crossing restrictions at DASAC and CLARK on the LTOWN STAR to MEM.
Narrative: While descending via the LTOWN6 arrival landing north transition; the FMS was having difficulty complying with the 210 KTS at DASAC restriction. The speed had increased to 225 KTS. Distracted by the airspeed constraint; I noticed that we had descended below the 8;000 FT restriction at CLARK Intersection by 500 FT about a mile prior to CLARK. I brought this to the attention of the pilot flying and a correction was made to comply with the restriction.
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.