Commercial Fixed Wing
Flight Crew Air Transport Pilot (ATP)
Communication Breakdown; Confusion; Training / Qualification
Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Requested ATC Assistance / Clarification
Human Factors
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.
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.