30 Questions
What is the maximum distance of VHF communications?
400 km
What is responsible for the long-range capability of HF radios?
Sky waves refracted through the ionosphere
Why do aircraft HF transmitters produce a higher output power than VHF transmitters?
To achieve long-distance communications
What is a common issue with HF communication over the middle of an ocean?
Thunderstorms or similar disturbances
What type of antenna is commonly used on modern aircraft with HF?
Long wire antenna
Why do jet aircraft rarely have long wire antennas?
Due to the increased risk of damage at high speeds
Where are the Service Interphone jacks located?
In various stations in and outside the aircraft
What is the primary function of the phone jacks and wiring?
To connect the handset or headset to the audio amplifier
What is the purpose of the push-to-talk button on the handset or headset?
To initiate transmission
What can be selected using the attendant panels' telephone-style handsets?
The flight/interphone system, another attendant station, or the public address system
What is the function of the audio amplifier in the interphone system?
To control the volume of the interphone
How do you operate the cabin interphone system?
By lifting the handset, selecting the audio system, and pressing the push-to-talk button
What is the formula used to calculate the VHF horizon in nautical miles for an aircraft?
1.23 × (√ height + √ 0)
What is the primary purpose of a microphone in a radio communication system?
To convert sound waves to electrical signals
What is the function of a demodulator in a radio receiver?
To separate the audio signal from the carrier wave
What is the typical power output of a UHF installation?
Up to 20 watts
What type of antennas are commonly used in UHF systems?
Small-blade type
What is the primary user group of UHF transceivers?
Military
What is the purpose of the underwater locator beacon in a commercial passenger aircraft?
To emit an emergency signal for emergency services
What is the frequency used by underwater locator beacons for transmission?
37.5 kHz
What is the cockpit voice recorder designed to monitor?
All signals transmitted and received in the cockpit
What is the function of the emergency locator transmitter in a life raft?
To emit an emergency signal for emergency services
Where is the emergency underwater locator beacon typically located in a commercial passenger aircraft?
As part of the flight data recorder
What is the characteristic of the signal emitted by the underwater locator beacon?
A constant beeping
What is the primary purpose of implementing ACARS in aircraft operations?
To minimize distractions to the flight crew during voice communications
What is the role of the VHF radio system in ACARS?
To transmit data between the aircraft and AOC facilities
What is the purpose of the ACARS computer on the aircraft?
To receive and process ACARS encoded data
What is the basis for the protocol of information transmitted in ACARS?
Aeronautical Radio Incorporated standard
What type of information is transmitted between the aircraft and AOC facilities in ACARS?
Routine operational information
What is one of the benefits of using ACARS in aircraft operations?
Enhancing logistics support for passenger consumables
Test your knowledge of the service interphone system in an aircraft, including its purpose, locations, and connections. Learn about the different stations it connects and how it works.
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