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PilotSchool Knowledge Base

Routine Pre-Flight Test of Aircraft Radio Telephone

The pre-flight check of an aircraft’s radio-telephone system is a fundamental procedure that ensures effective communication during flight. This section outlines the correct techniques and procedures required to conduct a routine pre-flight test of an aircraft radio-telephone, aligning with the standards set by the Civil Aviation Safety Authority (CASA) for the Private Pilot License (PPL).

1. Turning on the Radio

Begin the pre-flight test by switching on the aircraft radio:

  • Ensure the power source is active.
  • Turn on the radio system using the radio master switch or individual radio unit power switch.
  • Check that the circuit breakers or fuses are in the correct position.

2. Use of Intercom and Public Address System

Intercom and public address systems facilitate internal communication within the aircraft:

  • Test the intercom system by communicating with another crew member.
  • Adjust volume controls to ensure clarity.
  • If equipped, test the public address system for announcements to passengers.

3. Selecting Correct Frequencies

Proper frequency selection is vital for effective communication:

  • Refer to the Aeronautical Information Manual (AIM) or the airport frequency chart.
  • Set the radio to the pre-designated contact frequencies including ATIS, ground control, and air traffic control (ATC).
  • Verify that the frequencies are correctly displayed on the radio screen.

4. Use of Squelch Control

Squelch control minimizes background noise when the radio is not actively receiving a transmission:

  • Adjust the squelch control knob until the background noise just disappears.
  • Ensure that received signals are clear without excessive static.

5. Use of Radio Transmit and Receive Selector Switches

Selector switches allow toggling between transmission and reception modes:

  • Test the transmit switch by briefly pressing and speaking into the microphone.
  • Ensure the receive switch is set to the active frequency for listening to inbound transmissions.
  • Avoid holding down the transmit switch for prolonged periods to keep frequencies available for others.

6. Voice Activated Systems

Voice-activated systems offer convenience in hands-free communication:

  • Verify the activation and deactivation functionalities of the voice-activated system.
  • Adjust sensitivity settings to ensure the microphone activates only upon speech recognition.

7. Selection of Radio Navigation Equipment

Navigation equipment often integrates with the radio system for flight routing:

  • Ensure navigation radios are set to the appropriate VOR or ILS frequencies if applicable.
  • Test the navigation receiver for signal identification and clarity.

8. Correct Use of a Microphone

The integrity of radio communication depends on proper microphone use:

  • Hold the microphone close to your mouth at a consistent distance to ensure clear transmission.
  • Speak clearly and concisely, using standard radiotelephony phraseology.
  • Test the microphone by performing a radio check, expecting a clear response from ATC or maintenance personnel.

Conclusion

Completing a thorough pre-flight radio check ensures that the aircraft’s communication systems are operating correctly before departure. Consistent application of these procedures enhances safety and facilitates effective communication during flight operations. Refer to the manufacturer’s manual and CASA guidelines for aircraft-specific requirements and updates.

References