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A321 captain reported his aircraft model will not make sea mountain seven departure or ord O'hare two departure climb constraints if it accelerated above green DOT. The FMGC does not warn of the deviation until near the waypoints to be violated.
| Attributes | |
| ACN | 1401371 |
| Time | |
| Date | 201611 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | SEA.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | A321 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | FMS/FMC |
| Person 1 | |
| Function | Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Altitude Crossing Restriction Not Met Deviation - Altitude Undershoot Deviation - Procedural Published Material / Policy |
Narrative:
With past experience we knew of this problem and corrected our flight path. The A321 has a problem making altitude restrictions without flying at green dot (not accelerating to 250) or changing the thrust reduction altitude. Sea mountain seven departure SID and the ord departure O'hare two are just two examples. What appears on the FMS before takeoff and just prior to the constraint are all okay. But this changes just before you have no chance of making the constraint. Without prior knowledge of flying these departures and believing the FMS; you can easily violate these altitudes. Especially if you have been flying a better performing aircraft before; i.e. Boeing.these altitude restrictions need to be highlighted or cautioned in the 10-7 pages of these and other affected airports to help our crews avoid violating these restrictions.please add a caution to the 10-7 departure pages of the many airports that need extra vigilance in making these types of altitude constraints.
Original NASA ASRS Text
Title: A321 Captain reported his aircraft model will not make SEA MOUNTAIN SEVEN Departure or ORD O'HARE TWO Departure climb constraints if it accelerated above GREEN DOT. The FMGC does not warn of the deviation until near the waypoints to be violated.
Narrative: With past experience we knew of this problem and corrected our flight path. The A321 has a problem making altitude restrictions without flying at Green Dot (not accelerating to 250) or changing the thrust reduction altitude. SEA Mountain Seven Departure SID and the ORD departure O'HARE Two are just two examples. What appears on the FMS before takeoff and just prior to the constraint are all okay. But this changes just before you have no chance of making the constraint. Without prior knowledge of flying these departures and believing the FMS; you can easily violate these altitudes. Especially if you have been flying a better performing aircraft before; i.e. Boeing.These altitude restrictions need to be highlighted or cautioned in the 10-7 pages of these and other affected airports to help our crews avoid violating these restrictions.Please add a caution to the 10-7 departure pages of the many airports that need extra vigilance in making these types of altitude constraints.
Data retrieved from NASA's ASRS site 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.