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Air carrier captain reported a confusing published speed restriction on kustr RNAV arrival to bil contributed to a track heading deviation.
| Attributes | |
| ACN | 1585551 |
| Time | |
| Date | 201810 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | BIL.Airport |
| State Reference | MT |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Route In Use | STAR KUSTR3 |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Engineer Flight Crew Multiengine Flight Crew Instrument Flight Crew Flight Instructor |
| Experience | Flight Crew Last 90 Days 130 Flight Crew Total 17800 Flight Crew Type 6200 |
| Events | |
| Anomaly | Deviation - Procedural Clearance Deviation - Track / Heading All Types |
Narrative:
Arriving into bil on the KUSTR3 RNAV arrival; as soon as center handed us off to billings approach; we were cleared for the ILS 28R approach. At this point we were inside fsyth descending to 10;000 feet and slowing. Kustr has a max crossing speed of 250 KT above 10;000 feet. The next waypoint is yutur followed by pillr 'at 230 KT and 6;300 feet' then the transition to yigud and the approach for 28R. The approach plate; however; has a note saying 'maximum 230 KIAS' at pillr.' we flew 230 KIAS to pillr; but the relatively large heading change from approximately 207 degrees inbound to pillr to approximately 254 degrees outbound caused the airplane to overshoot on the transition from pillr to yigud before finally intercepting the final approach course. The mandatory 230KT at pillr on the STAR is too much for the autopilot to handle; and since the approach plate has a note for a maximum 230 KIAS at pillr; it's confusing. Is the mandatory speed at pillr on the kustr star just a misprint/omission where they left out the word maximum. Anyway; 230 KIAS is too much speed at pillr and should be reduced considerably.
Original NASA ASRS Text
Title: Air carrier Captain reported a confusing published speed restriction on KUSTR RNAV Arrival to BIL contributed to a track heading deviation.
Narrative: Arriving into BIL on the KUSTR3 RNAV Arrival; as soon as Center handed us off to Billings Approach; we were cleared for the ILS 28R approach. At this point we were inside FSYTH descending to 10;000 feet and slowing. KUSTR has a max crossing speed of 250 KT above 10;000 feet. The next waypoint is YUTUR followed by PILLR 'At 230 KT and 6;300 feet' then the transition to YIGUD and the approach for 28R. The approach plate; however; has a note saying 'MAX 230 KIAS' at PILLR.' We flew 230 KIAS to PILLR; but the relatively large heading change from approximately 207 degrees inbound to PILLR to approximately 254 degrees outbound caused the airplane to overshoot on the transition from PILLR to YIGUD before finally intercepting the final approach course. The mandatory 230KT at PILLR on the STAR is too much for the autopilot to handle; and since the approach plate has a note for a MAX 230 KIAS at PILLR; it's confusing. Is the mandatory speed at PILLR on the KUSTR Star just a misprint/omission where they left out the word MAX. Anyway; 230 KIAS is too much speed at PILLR and should be reduced considerably.
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.