Section II OPERATING UNDER USUAL CONDITIONS

TM 11-5820-670-12

Section II OPERATING UNDER USUAL CONDITIONS

Subject

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Page

Preflight Operational Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Operating Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

2-3.

PREFLIGHT OPERATIONAL CHECK.

NOTE

An operational check of the radio set is performed prior to each flight. All malfunctions,

failures, or other discrepancies noted in flight or during a preflight check shall be

Perform the preflight operational check in accordance with the applicable aircraft flight manual.

2-4. OPERATING PROCEDURES.

All operating procedures of the radio set are accomplished using the control unit which is conveniently

placed in the cockpit of the aircraft for use by the pilot and/or copilot. Depending on type of operation

necessary, the radio set can be operated in the two-way voice communications, retransmission, or

homing mode.

NOTE

Do not use frequencies of 33.90 MHz, 45.20 MHz, 56.50 MHz, or 67.80 MHz for any

radio set operations. These frequencies cause transmitter quieting of receiver and

therefore prevent normal operation.

STARTING PROCEDURES

NOTE

Before operating the radio set, operator should have a thorough knowledge of the com-

munications equipment of the aircraft in which the radio set is installed.

For proper operation and settings of the aircraft-installed communications equipment, refer to the

applicable aircraft flight manual. The following procedures are standard in most aircraft.

1. Turn on aircraft primary power.

2. Turn on power to radio set, which may be accomplished with one of the following: radio or

communications power switch, push-to-reset circuit breaker, or an intercommunications

power switch.

3. Turn on aircraft intercommunications system.

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