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B737 first officer reported several unusual maneuvers the FMC commanded to comply with restrictions for the sna DSNEE1 arrival.
| Attributes | |
| ACN | 1429161 |
| Time | |
| Date | 201703 |
| Place | |
| Locale Reference | SNA.Airport |
| State Reference | CA |
| Aircraft 1 | |
| Make Model Name | B737 Next Generation Undifferentiated |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Route In Use | STAR DSNEE1 |
| Flight Plan | IFR |
| Person 1 | |
| Function | First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Deviation - Procedural Published Material / Policy |
Narrative:
We used the dsnee 1 arrival into sna for the first time on this date. The aircraft used was a B737. Several issues were noted. 1. After the dsnee 1 arrival was programmed into the FMC; it warned of 'steep descent after roade'. After passing brckk waypoint; nose pitched down significantly to maintain VNAV path. Use of full speed brake was necessary to maintain the 280 knot restriction. After passing roade waypoint; nose pitched down even further; and the path indicator showed us 900 plus feet above the VNAV path. Full speed brake use continued. After passing phiya waypoint; airspeed immediately slowed to 220 knots in preparation for the dsnee waypoint restriction 220 knots at 8000 feet; but we were still 23 miles from dsnee. We informed socal approach that the aircraft was slowing; and we asked her if this would cause a problem. She responded that we should just fly the arrival as published and that he would file a [safety] report and requested that we file a report. We responded that we would file a report about the issues encountered with the dsnee 1 star. This report is for informational purposes only; as we exceeded no limits during the arrival.
Original NASA ASRS Text
Title: B737 First Officer reported several unusual maneuvers the FMC commanded to comply with restrictions for the SNA DSNEE1 Arrival.
Narrative: We used the DSNEE 1 arrival into SNA for the first time on this date. The aircraft used was a B737. Several issues were noted. 1. After the DSNEE 1 arrival was programmed into the FMC; it warned of 'steep descent after ROADE'. After passing BRCKK waypoint; nose pitched down significantly to maintain VNAV path. Use of full speed brake was necessary to maintain the 280 knot restriction. After passing ROADE waypoint; nose pitched down even further; and the path indicator showed us 900 plus feet above the VNAV path. Full speed brake use continued. After passing PHIYA waypoint; airspeed immediately slowed to 220 knots in preparation for the DSNEE waypoint restriction 220 knots at 8000 feet; but we were still 23 miles from DSNEE. We informed SoCal approach that the aircraft was slowing; and we asked her if this would cause a problem. She responded that we should just fly the arrival as published and that he would file a [safety] report and requested that we file a report. We responded that we would file a report about the issues encountered with the DSNEE 1 star. This report is for informational purposes only; as we exceeded no limits during the arrival.
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.