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Phenom 100 captain reports that his FMC incorrectly reads the homrr crossing restriction on the EAGUL5 RNAV to phx as a hard altitude instead of 'at or below' as depicted. This makes the vnnom crossing restriction impossible to achieve.
| Attributes | |
| ACN | 1026658 |
| Time | |
| Date | 201207 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | PHX.Airport |
| State Reference | AZ |
| Aircraft 1 | |
| Make Model Name | Embraer Phenom 100 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | Descent |
| Route In Use | STAR EAGUL5 |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | FMS/FMC |
| Person 1 | |
| Qualification | Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 50 Flight Crew Total 3400 Flight Crew Type 350 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Altitude Undershoot Deviation - Procedural Published Material / Policy |
Narrative:
The EAGUL5 arrival can be misleading for aircrew and could result in an unsafe position. If an aircrew were to pass homrr just below 16;000 ft; in accordance with the arrival procedure; and then be required to be between 11;000 and 10;000 ft within four miles; an unsafe descent rate could ensue (1;500 ft/NM or > 6;000 ft/min). Avionics systems read 'homrr at or below 16;000 ft' to be '16;000;' and when calculating ability to be between 11;000 and 10;000 ft in four miles; determines that it cannot be done and thus reads unable. Please consider altering the STAR to allow a more gradual descent.
Original NASA ASRS Text
Title: Phenom 100 Captain reports that his FMC incorrectly reads the HOMRR crossing restriction on the EAGUL5 RNAV to PHX as a hard altitude instead of 'at or below' as depicted. This makes the VNNOM crossing restriction impossible to achieve.
Narrative: The EAGUL5 arrival can be misleading for aircrew and could result in an unsafe position. If an aircrew were to pass HOMRR just below 16;000 FT; in accordance with the arrival procedure; and then be required to be between 11;000 and 10;000 FT within four miles; an unsafe descent rate could ensue (1;500 FT/NM or > 6;000 FT/min). Avionics systems read 'HOMRR at or below 16;000 FT' to be '16;000;' and when calculating ability to be between 11;000 and 10;000 FT in four miles; determines that it cannot be done and thus reads unable. Please consider altering the STAR to allow a more gradual descent.
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.