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Engine Running (but not taxiing) 0
Taxiing  3
Takeoff  3
Pattern  1
Final Approach and Landing  34
Go-around   0
Normal Flight  24
Undetermined  6
Total   71*
*Incidents in which two factors more involved are counted twice, thus making totals over 70.

These data can only be interpreted broadly. They suggest that fatigue occurs on both day and night flights, perhaps more frequently at night, although the proportions of all day and night flights are not known. They indicated that fatigue occurs on both contact and instrument flights and may also occur during simulated instrument flight. They also indicate that pilot errors resulting from fatigue seem to occur more frequently on the final approach or landing or during the course of normal flight.

Certain other information relative to each fatigue incident was requested in the interviews in order to determine what factors are associated with the occurrence of fatigue. This information is as follows:

1. Number of consecutive hours which each pilot had flown prior to the incident
2. Number of months the pilot had been assigned to the particular flight
3. Whether or not the incident occurred as a domestic or a foreign flight
4. Whether or not the incident occurred on a long hop or a short hop

An analysis of these data revealed that pilots reporting an incident in which fatigue was a factor had flown on an average of 8.65 consecutive hours prior to the occurrence of the incident, had been assigned to the same flight for an average of 15.48 months. Approximately 70% of the flights were domestic and approximately 55% were long hops. Few interpretations can be made of these percentages, inasmuch as the proportions of all flights which are domestic over foreign and long over short are not known.

Table 3 showed the distribution of pilot acts which was committed as a result of fatigue. The most frequently reported acts were in the job component of "Establishing and Maintaining Angle of Glide, Rate of Descent and Gliding Speed on Approach to landing. This would agree with the large percentage of fatigue incidents which occurred during approach and landing, as shown on pages 48 and 49.

Transcription Notes:
Reopened.