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A C560XL flight crew was unable to comply with the crossing restriction at vnnom intersection when cleared to descend via the eagul RNAV STAR. The reporter believes the procedure requires too steep a descent between the previous waypoint; homrr; and vnnom requiring; potentially; as much as a 5;000 ft descent in only 4.1 NM.
| Attributes | |
| ACN | 1001244 |
| Time | |
| Date | 201203 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | PHX.Airport |
| State Reference | AZ |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Citation Excel (C560XL) |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Descent |
| Route In Use | STAR EAGUL5 |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | FMS/FMC |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Instructor Flight Crew Multiengine Flight Crew Instrument |
| Experience | Flight Crew Last 90 Days 100 Flight Crew Total 8900 Flight Crew Type 1800 |
| Events | |
| Anomaly | Deviation - Altitude Undershoot Deviation - Altitude Crossing Restriction Not Met Deviation - Procedural Published Material / Policy Deviation - Procedural Clearance |
Narrative:
We were cleared to descend via the eagul 5 RNAV STAR into phx. The arrival was loaded into the FMS and the aircraft proceeded to descend per the vertical profile. The arrival called for us to cross homrr intersection at or below 16;000 MSL then cross vnnom between 10;000 and 11;000 MSL. The VNAV mode disconnected after we crossed homrr at 16;000. We reacted immediately but the required descent from 16;000 to 11;000 MSL must be completed in 4 NM. This is a very steep descent gradient which we were not able to achieve. We crossed vnnom at 12;000 MSL rather than the required [between 10 and] 11;000 MSL. I feel this crossing needs to be examined and that such a steep descent gradient should be removed for safety.
Original NASA ASRS Text
Title: A C560XL flight crew was unable to comply with the crossing restriction at VNNOM Intersection when cleared to descend via the EAGUL RNAV STAR. The reporter believes the procedure requires too steep a descent between the previous waypoint; HOMRR; and VNNOM requiring; potentially; as much as a 5;000 FT descent in only 4.1 NM.
Narrative: We were cleared to descend via the EAGUL 5 RNAV STAR into PHX. The arrival was loaded into the FMS and the aircraft proceeded to descend per the vertical profile. The arrival called for us to cross HOMRR intersection at or below 16;000 MSL then cross VNNOM between 10;000 and 11;000 MSL. The VNAV mode disconnected after we crossed HOMRR at 16;000. We reacted immediately but the required descent from 16;000 to 11;000 MSL must be completed in 4 NM. This is a very steep descent gradient which we were not able to achieve. We crossed VNNOM at 12;000 MSL rather than the required [between 10 and] 11;000 MSL. I feel this crossing needs to be examined and that such a steep descent gradient should be removed for safety.
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.