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.