Narrative:

Was informed by chief pilot on mar/wed/95 of impending investigation of a possible deviation from the 'pearson 1' departure (SID), from cyyz (toronto, ont). We were not aware of any deviation from the SID until informed the next dad. The departure was from runway 33, the SID states: after takeoff, turn left to 320 degrees, and intercept and maintain the 343 degree radial of yyz. No unauthorized turns below 3600 ft fly the radial to 4 DME to 3600 ft, for radar vectors. As best we recall, after takeoff, we turned to a heading of 320 degrees and contacted departure on 128.8. After contacting departure we were instructed to turn to a heading of 090 degrees. At this point we felt this was an authority/authorized the SID had ended. Their radar tracks showed us almost a mi to the left of the 343 degree radial before turning towards the radial. We made the turn at 3600 ft, then climbed to 5000 ft. It was our intent to comply with the noise abatement procedures, as well as ATC instructions. I felt that the confusion lies in what is an 'unauthorized turn.' and does ATC instruction override a SID? I would certainly think so. Also, if we were not where we should have ben why did ATC say nothing at all to us, of the supposed deviation? There was no mention of any possible conflict. Also, given a turn soon after takeoff before fully established on the SID makes for confusion. The words, 'cancel the SID' should be used when ATC desires that it is no longer necessary or warrants other action by the flight crew during the SID. This leaves no question as to what is to take place.

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Original NASA ASRS Text

Title: AN ACR MISINTERP THE INTENT OF A PUBLISHED DEP INSTRUCTION AFTER RECEIVING A VECTOR FROM ATC. THEY APPEARED TO BE CONFUSED DURING THE TRANSITION BTWN ATC HANDLING, AND THE PUBLISHED PROC.

Narrative: WAS INFORMED BY CHIEF PLT ON MAR/WED/95 OF IMPENDING INVESTIGATION OF A POSSIBLE DEV FROM THE 'PEARSON 1' DEP (SID), FROM CYYZ (TORONTO, ONT). WE WERE NOT AWARE OF ANY DEV FROM THE SID UNTIL INFORMED THE NEXT DAD. THE DEP WAS FROM RWY 33, THE SID STATES: AFTER TKOF, TURN L TO 320 DEGS, AND INTERCEPT AND MAINTAIN THE 343 DEG RADIAL OF YYZ. NO UNAUTH TURNS BELOW 3600 FT FLY THE RADIAL TO 4 DME TO 3600 FT, FOR RADAR VECTORS. AS BEST WE RECALL, AFTER TKOF, WE TURNED TO A HDG OF 320 DEGS AND CONTACTED DEP ON 128.8. AFTER CONTACTING DEP WE WERE INSTRUCTED TO TURN TO A HDG OF 090 DEGS. AT THIS POINT WE FELT THIS WAS AN AUTH THE SID HAD ENDED. THEIR RADAR TRACKS SHOWED US ALMOST A MI TO THE L OF THE 343 DEG RADIAL BEFORE TURNING TOWARDS THE RADIAL. WE MADE THE TURN AT 3600 FT, THEN CLBED TO 5000 FT. IT WAS OUR INTENT TO COMPLY WITH THE NOISE ABATEMENT PROCS, AS WELL AS ATC INSTRUCTIONS. I FELT THAT THE CONFUSION LIES IN WHAT IS AN 'UNAUTH TURN.' AND DOES ATC INSTRUCTION OVERRIDE A SID? I WOULD CERTAINLY THINK SO. ALSO, IF WE WERE NOT WHERE WE SHOULD HAVE BEN WHY DID ATC SAY NOTHING AT ALL TO US, OF THE SUPPOSED DEV? THERE WAS NO MENTION OF ANY POSSIBLE CONFLICT. ALSO, GIVEN A TURN SOON AFTER TKOF BEFORE FULLY ESTABLISHED ON THE SID MAKES FOR CONFUSION. THE WORDS, 'CANCEL THE SID' SHOULD BE USED WHEN ATC DESIRES THAT IT IS NO LONGER NECESSARY OR WARRANTS OTHER ACTION BY THE FLC DURING THE SID. THIS LEAVES NO QUESTION AS TO WHAT IS TO TAKE PLACE.

Data retrieved from NASA's ASRS site as of July 2007 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.