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Although they had programmed the the FMS to meet their ATC directed crossing restriction at newes; the flight crew of a B737-700 failed to note they were more than a thousand feet above the required descent gradient until the the CDU advised them they were not going to make the restriction. Herculean flight crew efforts failed to overcome the deficit.
| Attributes | |
| ACN | 1010950 |
| Time | |
| Date | 201205 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZNY.ARTCC |
| State Reference | NY |
| Aircraft 1 | |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Autoflight System |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Deviation - Altitude Crossing Restriction Not Met Deviation - Altitude Undershoot Deviation - Procedural Clearance |
Narrative:
We were level at about FL330. ATC instructed us to cross newes at FL240. The crossing restriction was properly entered into the FMS and the jet started it's descent on time and on path. Everything appeared normal. A couple minutes later; received a CDU message 'unable next altitude.' I looked at the VNAV display and we were 1;100 feet above the path. I used the speed brakes but we crossed newes about 700-1;000 feet high. Cause for path deviation unknown: winds were not a factor. More diligent monitoring by both pilots. Better FMS software.
Original NASA ASRS Text
Title: Although they had programmed the the FMS to meet their ATC directed crossing restriction at NEWES; the Flight Crew of a B737-700 failed to note they were more than a thousand feet above the required descent gradient until the the CDU advised them they were not going to make the restriction. Herculean flight crew efforts failed to overcome the deficit.
Narrative: We were level at about FL330. ATC instructed us to cross NEWES at FL240. The crossing restriction was properly entered into the FMS and the jet started it's descent on time and on path. Everything appeared normal. A couple minutes later; received a CDU message 'unable next altitude.' I looked at the VNAV display and we were 1;100 feet above the path. I used the speed brakes but we crossed NEWES about 700-1;000 feet high. Cause for path deviation unknown: Winds were not a factor. More diligent monitoring by both pilots. Better FMS software.
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.