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Air carrier flight crew given direct to iruse cleared RNAV Y runway 28R at boi and cross iruse at 6;800 ft. During the 100 plus degree turn to iruse the FMC sequenced to the next waypoint leading the crew to believe they had passed iruse and a descent to the next stepdown altitude.
| Attributes | |
| ACN | 952860 |
| Time | |
| Date | 201106 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | BOI.Airport |
| State Reference | ID |
| Aircraft 1 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Flight Plan | VFR |
| Component | |
| Aircraft Component | FMS/FMC |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Deviation - Altitude Crossing Restriction Not Met Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy |
Narrative:
Being vectored onto FMS approach we were given direct to iruse for the RNAV 28R approach. We had a turn from about 100 degrees to about 350 to get to iruse. During the turn the approach sequenced to the next waypoint and we ended up starting our descent about 3/4 mile outside the iruse fix. Boise made us aware and we stopped the descent to correct the problem. We weren't expecting the turn to final quite that soon and that tight around to final.
Original NASA ASRS Text
Title: Air Carrier flight crew given direct to IRUSE cleared RNAV Y Runway 28R at BOI and cross IRUSE at 6;800 FT. During the 100 plus degree turn to IRUSE the FMC sequenced to the next waypoint leading the crew to believe they had passed IRUSE and a descent to the next stepdown altitude.
Narrative: Being vectored onto FMS approach we were given direct to IRUSE for the RNAV 28R approach. We had a turn from about 100 degrees to about 350 to get to IRUSE. During the turn the approach sequenced to the next waypoint and we ended up starting our descent about 3/4 mile outside the IRUSE fix. Boise made us aware and we stopped the descent to correct the problem. We weren't expecting the turn to final quite that soon and that tight around to final.
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.