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A B757 flight crew misinterpreted the revision to their pre departure clearance clearance. They thought that they were assigned the 060 degree vector to intercept the SID, but the controller intervened when they made the turn onto the SID, indicating that they were to remain on the vector.
| Attributes | |
| ACN | 334300 |
| Time | |
| Date | 199604 |
| Day | Sat |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : las |
| State Reference | NV |
| Altitude | msl bound lower : 4000 msl bound upper : 4000 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : las |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure other departure sid : sid enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 334300 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| ASRS Report | 334299 |
| Events | |
| Anomaly | non adherence : clearance other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Pre departure clearance said las MEAD1 departure, pgs J72, note at bottom said turn right heading 060 degree vectors MEAD1 departure. Pre departure clearance was incorrectly interpreted to mean fly heading 060 degrees to intercept MEAD1 SID. Normally 070 degree heading is flown to intercept at 4000 ft. After passing 4000 ft I turned aircraft to intercept MEAD1. Supplemental information from acn 334299: captain turned 060 degrees and upon reaching 4000 ft began turn to bld as per MEAD1 SID. Controller called to bring us back to 060 degree heading and approximately 10 seconds later cleared us direct bld MEAD1.
Original NASA ASRS Text
Title: A B757 FLC MISINTERPRETED THE REVISION TO THEIR PDC CLRNC. THEY THOUGHT THAT THEY WERE ASSIGNED THE 060 DEG VECTOR TO INTERCEPT THE SID, BUT THE CTLR INTERVENED WHEN THEY MADE THE TURN ONTO THE SID, INDICATING THAT THEY WERE TO REMAIN ON THE VECTOR.
Narrative: PDC SAID LAS MEAD1 DEP, PGS J72, NOTE AT BOTTOM SAID TURN R HDG 060 DEG VECTORS MEAD1 DEP. PDC WAS INCORRECTLY INTERPRETED TO MEAN FLY HDG 060 DEGS TO INTERCEPT MEAD1 SID. NORMALLY 070 DEG HDG IS FLOWN TO INTERCEPT AT 4000 FT. AFTER PASSING 4000 FT I TURNED ACFT TO INTERCEPT MEAD1. SUPPLEMENTAL INFO FROM ACN 334299: CAPT TURNED 060 DEGS AND UPON REACHING 4000 FT BEGAN TURN TO BLD AS PER MEAD1 SID. CTLR CALLED TO BRING US BACK TO 060 DEG HDG AND APPROX 10 SECONDS LATER CLRED US DIRECT BLD MEAD1.
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.