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Accrued fatigue and micro-sleeps are reported by a B767 pilot as the suspected cause of minor omissions and errors made during an extended range flight.
| Attributes | |
| ACN | 631969 |
| Time | |
| Date | 200409 |
| Day | Thu |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | atc facility : zfw.artcc |
| State Reference | TX |
| Altitude | msl single value : 35000 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zfw.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B767-300 and 300 ER |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : relief pilot |
| ASRS Report | 631969 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | cabin event other non adherence : company policies other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : unable |
| Supplementary | |
| Problem Areas | Company Flight Crew Human Performance |
| Primary Problem | Company |
Narrative:
Several operrors of omission and commission resulting from accrued fatigue. Micro-sleeps suspected. All errors in this case were minor and were caught within the cockpit. Exact sequence flown several times but in this case, seat next to crew rest seat was sold to revenue passenger who engaged in loud conversation and disruptive movement during entire break. No rest obtained resulting in time since waking approaching 21 hours as errors began to occur.
Original NASA ASRS Text
Title: ACCRUED FATIGUE AND MICRO-SLEEPS ARE RPTED BY A B767 PLT AS THE SUSPECTED CAUSE OF MINOR OMISSIONS AND ERRORS MADE DURING AN EXTENDED RANGE FLT.
Narrative: SEVERAL OPERRORS OF OMISSION AND COMMISSION RESULTING FROM ACCRUED FATIGUE. MICRO-SLEEPS SUSPECTED. ALL ERRORS IN THIS CASE WERE MINOR AND WERE CAUGHT WITHIN THE COCKPIT. EXACT SEQUENCE FLOWN SEVERAL TIMES BUT IN THIS CASE, SEAT NEXT TO CREW REST SEAT WAS SOLD TO REVENUE PAX WHO ENGAGED IN LOUD CONVERSATION AND DISRUPTIVE MOVEMENT DURING ENTIRE BREAK. NO REST OBTAINED RESULTING IN TIME SINCE WAKING APCHING 21 HRS AS ERRORS BEGAN TO OCCUR.
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.