5.2.2 Logical

  If the value is a fixed format logical constant, it shall appear as a T or F in  column 30. A logical value is represented in free format by a single character consisting of T or F. This character must be the first non-blank character in columns 11-80. The only characters that may follow this single character are spaces, or a slash followed by an optional comment (see §5.1.2.3).