: Review the Manual of Standards (MOS)
The licensing privileges follow the Air Transport Association (ATA) numbering code.
Please review the ATA Codes
Open the Part 66 MOS on the ComLaw website.
Please review the following sections:
- Contents of the MOS
- 66.A.20 Privileges
- 66.A.30 Basic practical experience requirements
- Appendix 1 CASA knowledge syllabus
- Privileges of Category A
- Privileges of Category B1
- Privileges of Category B2
- Privileges of Category C
Please note: if a maintenance manual (for example) includes the hydraulic part of a system in the landing gear chapter it is still classed as hydraulics and therefore is outside the licence scope if the licence has a hydraulics exclusion.
What is the definition of LRU?
An Avionic Line Replaceable Unit (LRU) is an aircraft avionic part that satisfies all of the following requirements:
- it must have no mechanical input from, or output to, another part or mechanism;
- it must contain only electrical, electronic, instrument or radio parts, or software, or a combination of any such part or parts and software, designed to provide control, monitor or display functions, or a combination of such functions;
- it must not require any of the following in order to be installed, secured or connected to the aircraft:
- specialist knowledge or techniques;
- specialised equipment;
- rigging, or functional testing or adjustment, using specialised equipment external to the aircraft or brought on board the aircraft, to ensure that it is functioning properly.
The process of updating/transferring software data, using data loaders (whether portable or onboard), is treated as a avionic LRU replacement as long as LRU replacement serviceability can be established by using a simple test. Software transfer is not to be treated as an LRU replacement if the software installation does not have a discrete test outcome/result or if affected systems serviceability cannot be verified.
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