SUBSTITUTIONS- Users are permitted to exchange CTA's. Normally, the airline dispatcher will contact the ATCSCC with this request. The ATCSCC shall forward approved substitutions to the TMU's who will notify the appropriate terminals.
205(d)(2) says that for IFR navigation equipment appropriate to the ground facilities to be used must be operational and on the aircraft. The greatest problem to be resolved is the IFR approved GPS which allows DME and ADF substitutions on a ...
  
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