Sec.  80.862   Proof of capacity.

   (a) When directed by the Commission or its authorized representative, the
   station licensee must prove that the requirements of  Sec. 80.861 are met.

   (b) Proof of the ability of a battery used as a main or reserve source to
   operate continuously for 6 hours can be established by a discharge test over
   a prescribed period of time, when supplying power at the voltage required
   for normal and operation to an electrical load as prescribed by paragraph
   (d) of this section.

   (c) When the reserve power supply is an engine-driven generator, proof of
   the adequacy of the engine fuel supply to operate the unit contiuously for 6
   hours can be established by measuring the fuel consumption for 1 hour when
   supplying power, at the voltage required for normal operation, to an
   electrical load as prescribed by paragraph (d) of this section.

   (d) In determining the electrical load to be supplied, the following formula
   must be used:

   (1) One-half of the current of the required transmitter at its rated power
   output.

   (2) One fourth of the current of the automatic radiotelephone alarm signal
   generator; plus

   (3) Current of receiver; plus

   (4) Current of emergency light(s); plus

   (5) Current of the bridge-to-bridge transceiver when connected.

   (e) At the conclusion of the test specified in paragraphs (b) and (c) of
   this section, no part of the main or reserve power supply must have an
   excessive temperature rise, nor must the specific gravity or voltage of any
   battery be below 90 percent discharge point of the fully charged value.