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A B737-700 crew on the sea mountain 5 departure from runway 34 turned to heading 070 degrees prior to reaching 8 DME.
| Attributes | |
| ACN | 733961 |
| Time | |
| Date | 200704 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : sea.airport |
| State Reference | WA |
| Altitude | msl single value : 4000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : s46.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : initial |
| Route In Use | departure sid : mountain |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Experience | flight time last 90 days : 222 flight time type : 222 |
| ASRS Report | 733961 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 219 |
| ASRS Report | 733960 |
| Events | |
| Anomaly | non adherence : clearance non adherence : published procedure |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Supplementary | |
| Problem Areas | Chart Or Publication Airspace Structure Airport Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Situations | |
| Chart | sid : mountain five |
Narrative:
Normal sequence of events. Mountain 5 departure north off runway 34R. On departure; I was flying and misread the departure procedure to be at 4000 ft turn to heading 070 degrees. In actuality it reads at D8 off sea and at or above 4000 ft turn to heading 070 degrees. In acting on what I thought was at 4000 ft turn; I turned about 1 mile early (6.8 to 7.0 DME to 070 degrees). It was totally my fault. By the time we caught the error; we were already committed to the turn. Be sure to carefully read the SID or STAR. I really just missed the D8 description of the fix.
Original NASA ASRS Text
Title: A B737-700 CREW ON THE SEA MOUNTAIN 5 DEP FROM RWY 34 TURNED TO HDG 070 DEGS PRIOR TO REACHING 8 DME.
Narrative: NORMAL SEQUENCE OF EVENTS. MOUNTAIN 5 DEP N OFF RWY 34R. ON DEP; I WAS FLYING AND MISREAD THE DEP PROC TO BE AT 4000 FT TURN TO HEADING 070 DEGS. IN ACTUALITY IT READS AT D8 OFF SEA AND AT OR ABOVE 4000 FT TURN TO HEADING 070 DEGS. IN ACTING ON WHAT I THOUGHT WAS AT 4000 FT TURN; I TURNED ABOUT 1 MILE EARLY (6.8 TO 7.0 DME TO 070 DEGS). IT WAS TOTALLY MY FAULT. BY THE TIME WE CAUGHT THE ERROR; WE WERE ALREADY COMMITTED TO THE TURN. BE SURE TO CAREFULLY READ THE SID OR STAR. I REALLY JUST MISSED THE D8 DESCRIPTION OF THE FIX.
Data retrieved from NASA's ASRS site as of January 2009 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.