The degree to which capability of the pilot to operate IFR in the ATC system is
The nature and extent of assistance desired from ATC.
The exact nature and degree of assistance available from the ATC
system will vary considerably. It is therefore essential the pilot
inform the controller of the assistance needed. If no assistance is
required, normal handling may be expected. If special handling is
requested, the ATC controller will provide the maximum amount
of assistance, consistent with the equipment at his disposal and the
proper performance of his control functions with respect to other
IFR aircraft. Should the circumstances warrant greater attention
and priority handling with respect to other IFR aircraft, the pilot
should then declare an emergency.
"Miami Center, Navy 6E626, be advised my TACAN is inoperative.
No assistance required, navigating VOR only."
"Pensacola Approach, Navy 4F417, be advised my TACAN and VOR
have failed. Request radar vectors for a PAR (or ASR) approach to
5-8 RADIO INSTRUMENTS COMMUNICATIONS