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Pilot of tris deviates from assigned heading when a malfunctioning alternator problem diverts him from his primary task. Less than desired spacing with another aircraft results.
| Attributes | |
| ACN | 593975 |
| Time | |
| Date | 200309 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : bfi.airport |
| State Reference | WA |
| Altitude | msl single value : 1500 |
| Environment | |
| Flight Conditions | IMC |
| Light | Dawn |
| Aircraft 1 | |
| Controlling Facilities | tracon : s46.tracon |
| Operator | common carrier : air taxi |
| Make Model Name | BN-2A Mk. III/Trislander |
| Operating Under FAR Part | Part 135 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : s46.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | Dash 8 Series Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air taxi |
| Function | flight crew : single pilot |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 5600 flight time type : 700 |
| ASRS Report | 593975 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe inflight encounter : weather non adherence : far non adherence : clearance other spatial deviation |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | controller : issued advisory flight crew : took precautionary avoidance action flight crew : overcame equipment problem flight crew : became reoriented |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft ATC Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On climb out from bfi, I was IMC and finishing my after takeoff checklist when my alternator light came on. I reset my alternator then saw I was off my heading 50 degrees and turned back to my original heading but stopped after 30 degrees because I was overcome by spatial disorientation. It took a few seconds to shake it off and I turned back to the original heading. The controller said I didn't enter the other aircraft's airspace but was close. (It was raining at the time.)
Original NASA ASRS Text
Title: PLT OF TRIS DEVIATES FROM ASSIGNED HDG WHEN A MALFUNCTIONING ALTERNATOR PROB DIVERTS HIM FROM HIS PRIMARY TASK. LESS THAN DESIRED SPACING WITH ANOTHER ACFT RESULTS.
Narrative: ON CLBOUT FROM BFI, I WAS IMC AND FINISHING MY AFTER TKOF CHKLIST WHEN MY ALTERNATOR LIGHT CAME ON. I RESET MY ALTERNATOR THEN SAW I WAS OFF MY HDG 50 DEGS AND TURNED BACK TO MY ORIGINAL HDG BUT STOPPED AFTER 30 DEGS BECAUSE I WAS OVERCOME BY SPATIAL DISORIENTATION. IT TOOK A FEW SECONDS TO SHAKE IT OFF AND I TURNED BACK TO THE ORIGINAL HDG. THE CTLR SAID I DIDN'T ENTER THE OTHER ACFT'S AIRSPACE BUT WAS CLOSE. (IT WAS RAINING AT THE TIME.)
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.