ANALYSIS OF FLIGHT LOADS DURING LOW-ALTITUDE PIPELINE PATROL OPERATIONS.
NATIONAL AERONAUTICAL ESTABLISHMENT OTTAWA (ONTARIO)
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The report presents an analysis of 1135 hours data from counting accelerometers installed in three Piper Aztec aircraft employed on pipeline patrol operations in Canada. Flight tests were also made to determine the magnitude of the stresses in the wing main spar over a range of normal accelerations. The frequency distribution of normal accelerations is the most severe obtained to date from civil operations in Canada, leading to a very great reduction in estimated fatigue life as compared with what may be termed the normal operating case for this class of aircraft. Fortunately, the maximum stress per g measured in the wing spar structure of the Aztec is sufficiently low that no immediate fatigue problems are foreseen. However, it must be emphasised that the degree of confidence in this statement is conditional upon the total number of hours accumulated by any one aircraft on pipeline patrol operations, and it is recommended that intensive crack-detection procedures should be instituted as soon as the total hours accumulated by any one aircraft reach 6000. Author
- Civilian Aircraft