When must batteries in an emergency locator transmitter (ELT) be replaced or recharged, if rechargeable?

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(Refer to figure 23, area 2; and figure 32.) What is the correct UNICOM frequency to be used at Coeur D’Alene to request fuel?

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(Refer to figure 26, area 3.) If Redbird Tower is not in operation, which frequency should be used as a Common Traffic Advisory Frequency (CTAF) to monitor airport traffic?

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Where should the pilot look for this traffic?

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An ATC radar facility issues the following advisory to a pilot flying on a heading of 090°:
“TRAFFIC 3 O’CLOCK, 2 MILES, WESTBOUND…”