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Questions and Answers
What is the primary function of Very High Frequency (VHF) communication in aviation?
What is the primary function of Very High Frequency (VHF) communication in aviation?
Which frequency range is utilized for VHF communications?
Which frequency range is utilized for VHF communications?
Which of the following is NOT a requirement for obtaining a Singapore Aircraft Maintenance Engineer (AME) Licence?
Which of the following is NOT a requirement for obtaining a Singapore Aircraft Maintenance Engineer (AME) Licence?
What communication system is utilized for emergency location in aviation?
What communication system is utilized for emergency location in aviation?
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Which statement about VHF communication is true?
Which statement about VHF communication is true?
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What is the significance of the VHF range related to antenna heights?
What is the significance of the VHF range related to antenna heights?
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Which assessment component contributes the least to the overall grading for the avionic systems course?
Which assessment component contributes the least to the overall grading for the avionic systems course?
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What method of communication is mainly utilized for air traffic control?
What method of communication is mainly utilized for air traffic control?
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What is a primary use of HF communication?
What is a primary use of HF communication?
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Which factor does NOT affect the range of VHF transmission?
Which factor does NOT affect the range of VHF transmission?
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What does the coupler in the HF system do?
What does the coupler in the HF system do?
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What gives the VHF system its ability to transmit signals?
What gives the VHF system its ability to transmit signals?
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Which of the following statements about HF communication is correct?
Which of the following statements about HF communication is correct?
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What type of input does the flight interphone system provide for voice transmission in the VHF system?
What type of input does the flight interphone system provide for voice transmission in the VHF system?
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Which of the following can cause loss of HF voice communication under certain circumstances?
Which of the following can cause loss of HF voice communication under certain circumstances?
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Which component directly controls frequency selection and power settings in an HF communication system?
Which component directly controls frequency selection and power settings in an HF communication system?
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What does the de-modulated audio in the HF system signal?
What does the de-modulated audio in the HF system signal?
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Which of the following elements is NOT part of the VHF system architecture?
Which of the following elements is NOT part of the VHF system architecture?
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What is the primary function of the SELCAL system in aviation?
What is the primary function of the SELCAL system in aviation?
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Which frequency corresponds to the RED 'A' SELCAL tone?
Which frequency corresponds to the RED 'A' SELCAL tone?
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How does the SELCAL decoder alert the cockpit crew when their assigned code is received?
How does the SELCAL decoder alert the cockpit crew when their assigned code is received?
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What purpose does the Emergency Locator Transmitter (ELT) serve?
What purpose does the Emergency Locator Transmitter (ELT) serve?
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Which of the following statements about the RESCU 406 beacon is incorrect?
Which of the following statements about the RESCU 406 beacon is incorrect?
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What is the normal emission duration of an activated ELT?
What is the normal emission duration of an activated ELT?
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To activate the ELT in a land operation scenario, what must be done with the liquid container?
To activate the ELT in a land operation scenario, what must be done with the liquid container?
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What component of the SELCAL system is responsible for delivering audio to the decoder?
What component of the SELCAL system is responsible for delivering audio to the decoder?
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What should a pilot do after receiving a SELCAL alert?
What should a pilot do after receiving a SELCAL alert?
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Which feature is NOT part of the RESCU 406 beacon?
Which feature is NOT part of the RESCU 406 beacon?
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Study Notes
Avionic Systems Overview
- Avionics systems include VHF/HF, ILS, VOR, ADF, FMS, and GPS.
- Radar systems include primary, weather, and secondary radar.
Assessment
- Semester Examination: 50%
- Mid-Semester Test: 20%
- Lab Test: 10%
- Lab Quiz: 10%
- General Performance: 10%
Singapore Aircraft Maintenance Engineer (AME) Licence Application Requirements
- Applicant must be at least 21 years old.
- Applicant must be a Singaporean or permanent resident.
- Applicant must be able to read, write, and converse in English.
- Applicant must be employed by an organization that operates or services Singapore-registered aircraft.
- Applicant must have the practical experience specified in SAR Section 66 and have passed the prescribed examinations for the license category.
- Applicant must not have any disability that could negatively affect technical skills or judgment.
Chapter 1: VHF/HF Communication Systems
- Aviation communication primarily uses voice modulation of radio waves.
- Future communication may utilize data transfer without human voice.
- Voice communication remains essential for safe air traffic control.
Learning Outcomes
- Airborne VHF Communication
- Airborne HF Communication
- Concept of Selective Calling System (SELCAL)
- Operation of Emergency Locator Transmitter (ELT)
VHF Communication
- VHF communication is line-of-sight, using direct waves.
- It provides short-range air-to-air and air-to-ground voice communication.
- Its primary use is for Air Traffic Control (ATC).
- The VHF band is 118-136 MHz.
VHF Communication Range
- Range (R) is calculated as 1.25 * (√Hr + √Ht).
- R is in nautical miles.
- Hr and Ht are the receiver and transmitter antenna heights in feet.
- Example: A VHF signal from an aircraft at 12,000ft could be received by an aircraft at 9,000 feet up to 255 nautical miles.
Factors Affecting VHF Transmission Range
- Transmitter power (aircraft and ground station).
- Transmitter antenna height.
- Receiver antenna height.
- Obstacles blocking the signal.
VHF System Components
- Frequency control panel.
- Flight interphone system (microphone).
- Transceiver (transmitter + receiver).
- Antenna.
- RF coax line.
- Audio is routed to interphone and SELCAL.
- Flight recorder system acknowledges transmission.
HF Communication
- HF communication uses sky waves for long-range voice communication.
- Primarily for Air Traffic Control (ATC).
- The HF band is 2-22 MHz.
Factors Affecting HF Transmission Range
- Transmitter power (aircraft and ground station).
- Time of day.
- Season of the year.
- Ionospheric disturbance.
- Geographical locations.
- Frequency in use.
HF System Components
- Frequency and power control panel for frequency selection and power settings.
- Flight interphone system for audio input.
- Transceiver (transmitter + receiver).
- Coupler (matching network for antenna).
Selective Calling (SELCAL)
- Pilots previously had to listen to radio continuously.
- SELCAL mutes the receiver until ATC transmits a code for a specific aircraft.
- SELCAL uses tones for specific aircraft identification.
SELCAL Tone Allocation
- Includes a specific tone for each aircraft designation.
SELCAL System Components
- Decoder (five channels).
- Tone selector (routing VHF/HF to decoder).
- Selcal lamp/switches (warning alarm for code reception).
Emergency Locator Transmitter (ELT)
- ELTs are radio devices for aircraft emergency use.
- ELT activation transmits signals to locate crash sites.
- ELTs use for rescue operations.
RESCU 406
- A programmable compact transmitter.
- Battery workable in water.
- Has a lanyard card, antenna, plastic water bag.
- Transmits two kinds of rescue signals (Civil and Military).
- Civil frequencies are 121.5 MHz.
- Military Frequencies are 243.0 MHz
ELT Water Operation
- Unroll and tie lanyard card to raft, place ELT in water.
- Transmits automatically upon immersion.
ELT Land Operation
- Erect antenna properly, position antenna without obstacles, pour liquids into container to activate water-activated switch.
- Ensure battery casing end is inserted into liquid container so the beacon transmits effectively
ELT Current Consumption Example
- Calculate current consumption for ELT using a Nickel-Cadmium battery with a 240 mAh rating. (Example provided).
Additional Notes
- Given information suggests a course on Avionic Systems.
- VHF diagrams and diagrams provided.
- HF diagrams and diagrams provided.
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Description
This quiz covers key concepts in avionic systems, including VHF/HF, radar systems, and communication technologies. It also includes requirements for the Singapore Aircraft Maintenance Engineer licence. Test your knowledge on aviation systems and licensing criteria.
