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Elements and Performance Criteria

1. Prepare to diagnose aviation navigation circuits and system faults
   • Work health and safety (WHS)/occupational health and safety (OHS) requirements and workplace procedures for a given work area are identified and applied
2. Aviation operational safety procedures for a given work area are obtained and applied
3. WHS/OHS risk control measures and workplace procedures are followed in preparation for aviation work activity
4. Safety hazards that have not previously been identified are documented on job safety assessments, risks assessed and control measures implemented in consultation with appropriate person/s
5. Extent of faults is determined from reports, circuit diagrams and other relevant documentation, and discussions with appropriate person/s
6. Appropriate person/s is consulted to ensure the work is coordinated effectively with others involved on the work site
7. Tools, equipment and testing devices needed to diagnose faults are obtained in accordance with workplace procedures and checked for correct operation and safety
8. Diagnose and rectify aviation navigation system faults
   • WHS/OHS risk control measures and workplace procedures for carrying out work activities are followed
9. Need to inspect, test or measure live work is determined in accordance with WHS/OHS requirements and, as required, conducted in accordance with workplace safety procedures
10. Circuits, machines and plant are checked and isolated in accordance with WHS/OHS requirements and workplace procedures
11. Logical diagnostic methods are applied to diagnose aviation navigation system faults, employing measurements and estimations of system operating parameters in accordance with system operational requirements
12. Suspected fault scenarios are tested as being the source of navigation system problems
13. Source of the fault is identified and competent person/s engaged to rectify the fault in accordance with workplace procedures
14. Faults in the electronic components of the system are rectified in accordance with navigation system operation standards
15. Aviation navigation system is inspected and tested to verify the system operates as intended and to specified requirements
16. Decisions for dealing with unplanned situations are made from discussions with appropriate person/s and job specifications and requirements
17. Unplanned situations are responded to in accordance with workplace procedures in a manner that minimises risk to personnel and equipment
18. Diagnosis and rectification activities are carried out efficiently without waste of materials or damage to apparatus, the surrounding environment or services using sustainable energy practices
19. Commission aviation navigation system
    • WHS/OHS risk control measures and procedures for carrying out the work are followed
20. Testing and measuring devices are connected and set up in accordance with job requirements and the particular air navigational system
21. Measuring instruments are set up and adjusted in accordance with transmission/reception requirements and equipment manufacturer instructions
22. Adjustments are made to provide optimum transmission/reception performance within regulatory requirements
23. Setting up is carried out efficiently without waste of materials or damage to apparatus, the surrounding environment or services using sustainable energy principles
24. Complete and report fault diagnosis and rectification activities
    • WHS/OHS work completion risk control measures and workplace procedures are followed
25. Worksite is made safe in accordance with workplace safety procedures
26. Rectification of faults is documented in accordance with workplace procedures
27. Appropriate person/s is notified in accordance with workplace procedures that the aviation navigation system faults have been rectified and recommission

Range Statement

Range is restricted to essential operating conditions and any other variables essential to the work environment. Non-essential conditions may be found in the UEE Electrotechnology Training Package Companion Volume Implementation Guide.
Diagnosing and rectifying system faults in electronic air navigation systems must include at least the following:	four system faults in four of the following systems: non-directional beacon (NDB) very high frequency (VHF) omni directional radio range (VOR) distance measuring equipment (DME) instrument landing system (ILS) global navigation satellite system (GNSS)

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Performance Evidence

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements, performance criteria and range of conditions on at least one occasion and include:

applying logical diagnostic methods using fault scenarios to test the source of system faults identifying faults and competency needed to rectify them rectifying faults in system electronics verifying that the system operates correctly documenting fault rectification dealing with unplanned events applying sustainable energy principles and practices commissioning of air navigational system completing and reporting fault diagnosis and rectification activities implementing relevant work health and safety (WHS)/occupational health and safety (OHS) requirements and workplace procedures and practices, including the use of risk control measures.

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Knowledge Evidence

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements, performance criteria and range of conditions and include knowledge of:

electronic communications - air navigation systems, including: aviation navigation services and principles encompassing: role of navigation aids in providing air traffic control (ATC) services functions provided by navigational aids Rho Theta concept in context of navigational aids used within aviation relevant International Civil Aviation Organisation (ICAO) (Annex 10) specifications monitoring – equipment, status and pilot principle of operation of the non-directional beacon (NDB) encompassing: simple block diagram of an NDB frequency band of operation parameters ICAO requires to be monitored typical radiation hazard issues simple block diagram of the aircraft automatic direction finding (ADF) display NDB used by pilots and ATC principle of operation of the CVOR/DVOR encompassing: simple block diagram of a CVOR labelling each part basic principles of variable and reference information radio frequency (RF) phasing and far field space modulation frequency band of operation features of a typical aircraft display possible errors and their cause in a CVOR typical CVOR and DVOR facilities main differences of operation between CVOR and DVOR principle of operation of the distance measuring equipment (DME) encompassing: simple block diagram of a DME typical timing diagram from interrogation to reply features of aircraft display system frequency band of operation modes of operation principle of operation of the instrument landing system (ILS): frequency band of operation simple diagram of the localiser antenna pattern marking on it the zero DDM line, the represented colour and modulating frequency of each lobe and the clearance signal simple sketch showing the glide path and the location of the marker beacons listing their identification, frequency and duration simple block diagram to show the generation of the carrier and sidebands and sideband only signals ILS antenna arrays and far field radiation patterns far field phasing and space modulation terms DDM and SDM performance requirements for CAT I, CAT II and CAT III ILS principle of global navigation satellite system (GNSS): basic principles of the wide area differential global positioning system (WADGPS) basic principles of the local area differential global positioning system (LADGPS) NDB technology and maintenance: key functional modules of a contemporary NDB transmitter function of the aerial coupling unit radiation hazard issues, site restrictions and safety considerations in context of an NDB facility signals in and out of the main components key features and theory of operation of an NDB antenna (field pattern, capacity hat and ground plane) hardware configurations of current models of NDB used in the National Airways System of Australia indicators on NDB equipment that may be used to determine status and locate a fault method(s) for conducting routine performance measurements on NDB equipment process for removing an NDB from service correct test equipment based on measurement tolerance and parameter being measured correct use of selected test equipment process for returning the aid to service locate and identify appropriate NDB documentation (AEIs) mandated flight check of an NDB DME technology and maintenance: key functional modules of a contemporary DME beacon modes of operation and relevant channel spacing for the interrogation and reply of the beacon purpose of the "squitter" typical DME block diagram, the signal flow through the beacon from incoming interrogation to outgoing reply function of each module in a contemporary DME term "Gaussian shaped pulse" and why it is used operation and purpose of the identification signal including test transmissions definition of "dead time" monitored parameters of a DME controls and indicators correct ON/OFF sequence process for removing a DME from service auto-recycle operation typical function of the CTU for testing typical alarm registers measurement of parameters such as beacon delay, pulse spacing, pulse width, Ident, beacon sensitivity, selectivity, reply rate, dead time, frequency, monitor limits, antenna VSWR and using the correct test equipment correct use of test equipment correlate the measurements to the standard operating conditions (SOC) maintenance actions that may be performed without the requirements of a flight inspection flight calibration check of an DME process for returning the aid to service location and identification of appropriate DME documentation (AEIs) CVOR technology and maintenance: principles of operation of a VOR and how the component signals are generated in a contemporary CVOR beacon basic operation and functionality of the transmitter, goniometer, modulation eliminator, monitor and antenna typical monitored parameters for a CVOR purpose of monitor bypass correct use of test equipment and interpretation of results measurement of performance parameters using the correct test equipment correct use of test equipment correlate the measurements to the SOC maintenance actions that may be performed without the requirements of a flight inspection maintenance actions that do require a flight inspection importance of beacon accuracy DVOR technology and maintenance: principles of operation of a DVOR and how the component signals are generated in a contemporary DVOR beacon basic operation and functionality of the modules used in the following sub-systems: carrier generation and modulation, timing sequence generation, sideband amplifier and modulator, sideband antenna commutation, monitor and controller front panel indications under normal and fault conditions operation and functionality of the following circuits: carrier amplifier and modulation (CGD, CPA, CDC and CMP), timing signals generation (TSD), reference phase generator (RPG), antenna switching (ASD and ADS), sideband generator (SGN, SMA and SCU), control unit (CTU), monitor unit (MRF, MSC, MFI, MBD and MSD) typical monitored parameters for a DVOR correct use of test equipment and interpretation of results measurement of performance parameters using the correct test equipment correct use of test equipment correlate the measurements to the SOC maintenance actions that may be performed without the requirements of a flight inspection maintenance actions that do require a flight inspection importance of beacon accuracy ILS technology and maintenance: ILS functional blocks and typical cabinet modules of a localiser and glide path (NM7000 series) main functional elements of a contemporary marker beacon location and function of modules and system interconnections: transmitter, changeover, monitor, transmitter controller, remote control, RMS/RMM and power block diagram illustration at specified points, the signal flow out from the distribution side and/or return via the recombination side of a localiser and/or glide path operation of a specified localiser antenna array operation of an ‘M’-array or other specified glide path antenna array the features and function of the RMM and/or RMS performance requirements for CAT I, CAT II and CAT III ILS and how these are provisioned in the system hardware and monitoring function of equipment indicators and controls, including the correct operation of controls to achieve a nominated function typical monitored parameters for a localiser, glide path and marker beacon correct use of test equipment (BITE and external) and interpretation of results measurement of performance parameters using the correct test equipment correct use of test equipment correlate the measurements to the SOC maintenance actions that may be performed without the requirements of a flight inspection maintenance actions that do require a flight inspection typical tests and maintenance actions required during a flight calibration of an ILS relevant Civil Aviation Safety Authority (CASA) national operating standards, workplace policies and procedures relevant job safety assessments or risk mitigation processes relevant WHS/OHS and CASA legislated requirements relevant workplace documentation.

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