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A B747-400 captain reports his B747-400 FMC is unable to routinely fly the eddf marun 2G (overlay) RNAV SID as published.
| Attributes | |
| ACN | 903670 |
| Time | |
| Date | 201008 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | EDFF.TRACON |
| State Reference | FO |
| Aircraft 1 | |
| Make Model Name | B747-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Route In Use | SID MARUN 2G |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | FMS/FMC |
| Person 1 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 240 Flight Crew Total 20000 Flight Crew Type 1500 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Deviation - Track / Heading All Types |
Narrative:
This is my second report regarding the eddf marun 2G (overlay) RNAV SID. On ground; map display showed 2 magenta lines at DF236; one turning and one straight ahead. While flying SID; at DF236 and 4;000 MSL steer bars commanded straight ahead for 1.5 to 2 miles past DF236 before turning towards DF237. This resulted in being approximately 2 miles left of track; missing DF237 (passed abeam) and getting back on track after DF237. Steer bars were followed precisely. The B747 cannot fly [this departure on autoflight]. The B747 FMC is too slow to detect when an altitude is reached and when a flyover waypoint has been passed. This SID requires timely maneuvering and rapid updates to the FMC in order for it to be flown correctly and precisely. Please take action to prevent crews from possibly getting violated. Put out a NOTAM; at least; advising them of the possibility of this event or do not permit B747s to utilize the eddf marun 2G (overlay) RNAV SID departures.
Original NASA ASRS Text
Title: A B747-400 Captain reports his B747-400 FMC is unable to routinely fly the EDDF MARUN 2G (OVERLAY) RNAV SID as published.
Narrative: This is my second report regarding the EDDF MARUN 2G (OVERLAY) RNAV SID. On ground; map display showed 2 magenta lines at DF236; one turning and one straight ahead. While flying SID; at DF236 and 4;000 MSL steer bars commanded straight ahead for 1.5 to 2 miles past DF236 before turning towards DF237. This resulted in being approximately 2 miles left of track; missing DF237 (passed abeam) and getting back on track after DF237. Steer bars were followed precisely. The B747 cannot fly [this departure on autoflight]. The B747 FMC is too slow to detect when an altitude is reached and when a flyover waypoint has been passed. This SID requires timely maneuvering and rapid updates to the FMC in order for it to be flown correctly and precisely. Please take action to prevent crews from possibly getting violated. Put out a NOTAM; at least; advising them of the possibility of this event or do not permit B747s to utilize the EDDF MARUN 2G (OVERLAY) RNAV SID departures.
Data retrieved from NASA's ASRS site as of April 2012 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.