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Air carrier captain; descending on the YWT4 arrival to cyyz with a hard altitude assignment at rokto; is queried by the controller why so many crews from his company miss the depicted altitude at rokto. There are two identical arrivals except for altitude and airspeed restrictions; the YWT4 for turbojets and the ROKTO4 for turboprops.
| Attributes | |
| ACN | 1032980 |
| Time | |
| Date | 201208 |
| Place | |
| Locale Reference | CYYZ.Airport |
| State Reference | ON |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Route In Use | STAR YWT4 |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Deviation - Procedural Published Material / Policy |
Narrative:
Flying the YWT4 into toronto; we were cleared to cross rokto at 250 KTS and 11;000 ft with restrictions. We were following the ywt.ROKTO4 because that is the first chart you come to that says ykt and it has a crossing of rokto at 11;000 ft. However; that approach is for turboprops only. That is written very small at the top of the block on the page. Crossing rokto at 11;000 ft and 250 KTS as cleared; toronto center asked us about the crossing window we missed. We were unsure of what he meant and asked. He said many [company] crews miss the crossing window; but other airlines do not. He then handed us off to approach. The first officer obtained the phone number for center from approach. From the hotel; the first officer called center and it was explained that there is a crossing window of 16;000 to 14;000 ft at rokto for turbojets. That is on a different chart which we should have been using which is the ykt.YKT4 for turbojets only. We're cleared to cross at 11;000 ft by the same center controller so we did not violate an altitude but did have the incorrect approach plate out.
Original NASA ASRS Text
Title: Air Carrier Captain; descending on the YWT4 arrival to CYYZ with a hard altitude assignment at ROKTO; is queried by the Controller why so many crews from his company miss the depicted altitude at ROKTO. There are two identical arrivals except for altitude and airspeed restrictions; the YWT4 for turbojets and the ROKTO4 for turboprops.
Narrative: Flying the YWT4 into Toronto; we were cleared to cross ROKTO at 250 KTS and 11;000 FT with restrictions. We were following the YWT.ROKTO4 because that is the first chart you come to that says YKT and it has a crossing of ROKTO at 11;000 FT. However; that approach is for turboprops only. That is written very small at the top of the block on the page. Crossing ROKTO at 11;000 FT and 250 KTS as cleared; Toronto Center asked us about the crossing window we missed. We were unsure of what he meant and asked. He said many [company] crews miss the crossing window; but other airlines do not. He then handed us off to Approach. The First Officer obtained the phone number for Center from Approach. From the hotel; the First Officer called Center and it was explained that there is a crossing window of 16;000 to 14;000 FT at ROKTO for turbojets. That is on a different chart which we should have been using which is the YKT.YKT4 for turbojets only. We're cleared to cross at 11;000 FT by the same Center Controller so we did not violate an altitude but did have the incorrect approach plate out.
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.