This data record may be omitted, in which case the default value of 3 hours will be used.

      2   5  7   11    16
    - --- -- ---- -----
   |X|XXX|  |TPSH|     |
    - --- -- ---- -----
          |   |     |
          |   |     |
          |   |     |
          |   |     |_(1) Number of Hours (I5)
          |   |
          |   |_Compulsory Data Record Keyword (A4)
          |
          |_Optional User Identifier (A2)

(1) The number of hours for which the expected peak stress is calculated

The extreme values of stress are based on the assumption that stress has a Rayleigh distribution. The peak stress is given by

where

n = the number of cycles/hour, based on the stress time history calculation of the mean of the number of positive and negative peaks