25 Questions
What is the primary purpose of a dedicated overhaul facility?
To ensure the correct environmental conditions and special test equipment are available for maintenance and repair
According to the component maintenance manual (CMM), what type of work is covered?
Work conducted during maintenance and repair
What is the typical approach for smaller aircraft operators or those with limited fleets?
Sending components to a third-party maintenance organisation
What is the primary reason for removing certain components from an aircraft?
Only when they have failed (On-Condition)
What type of systems may include components that require maintenance and troubleshooting?
Hydraulic, pneumatic, fuel, air conditioning, pressurisation, electrical, and electronic systems
Which of the following is essential to ensure correct disassembly and reassembly of components?
Following the manufacturer's AMM and CMM
What should be done with parts removed during maintenance?
Labelled and stored correctly and safely
What is the primary consideration when preparing an aircraft for hangar maintenance?
Clearing the hangar of all obstacles and ensuring sufficient clearance
What is the correct order of disassembly for an aircraft?
Main planes, tail unit, undercarriage units, centre section, fuselage
Why is it important to achieve certain alignments, dimensions, or profiles when assembling components?
To meet the manufacturer's specifications
What is the purpose of 'Do Not Operate' tags in the flight deck?
To identify areas that require maintenance
What is the primary reason for positioning trestles during aircraft maintenance?
To prevent the aircraft from overbalancing during maintenance
What should be done before beginning a maintenance task?
Ensure you have the required tools and work package
What is typically done at a large maintenance base?
Replacement of major components or modules
What is a critical step in the re-assembly process?
Ensuring all parts are cleaned and protected before installation
What is the purpose of replacing components with 'zero-life' items prior to re-assembly?
To ensure the aircraft can fly for a considerable time before parts need replacement
What is the purpose of using penetrating oil when dismantling an aircraft part?
To provide both anti-corrosion action and lubrication
What may be recommended by the AMM to assist in the removal of seized fasteners?
A range of actions, including the use of penetrating oil, heat, or cold
What type of items are usually discarded at removal?
All of the above
Why may an aircraft's major components need to be replaced?
After a certain number of flying hours, calendar time, or operating cycles
What is the primary purpose of using a jig during airframe assembly?
To guarantee consistency over a number of components
Which of the following hazards is NOT mentioned as a potential threat during disassembly and reassembly?
Fire hazards
What is the primary reason why an engineer must be aware of components that pose a threat to their safety?
To reduce the risk of injury to themselves and others
What is an example of a fluid system that poses a hazard during disassembly and reassembly?
Aircraft brake system
What is the purpose of an engineer's awareness of stored pressure in components?
To reduce the risk of injury to themselves and others
Study Notes
Preparations for Maintenance
- A safe and stable working environment is essential, including sufficient clearance in the hangar and precautions taken according to the manufacturer's instructions.
- The aircraft must be de-fueled and devices such as emergency oxygen canisters removed before entering the hangar.
Disassembly and Re-Assembly
- The correct sequence of disassembly is: main planes, tail unit, undercarriage units, centre section, and fuselage.
- Re-assembly is done in the reverse order of disassembly, ensuring all parts are cleaned, protected, and serviceable before installation.
Replacement of Major Components/Modules
- Major component replacement typically occurs at a large maintenance base with required equipment and specialized facilities.
- Examples include engine overhaul or replacing a damaged wing, requiring a dedicated overhaul facility with correct environmental conditions and special test equipment.
Disassembly and Re-Assembly of Minor Components
- Minor components include hydraulic, pneumatic, mechanical, electromechanical, or electrical parts found in fuel, air conditioning, pressurization, electrical, and electronic systems.
- These components have their own maintenance manuals (CMMs) and may be sent to a component overhaul facility or a third-party maintenance organization.
Basic Disassembly and Re-Assembly Techniques
- Correct techniques and standard practices are essential, as outlined in the aircraft, engine, and component manufacturers' maintenance manuals (AMM and CMM).
- A clean, controlled, and well-laid-out workspace is necessary, with safety precautions and proper labeling and storage of removed parts.
Safety Considerations
- Components can pose hazards, including impact or pinch hazards, spring-loaded mechanisms, stored pressure, electrical power, falling parts, and fluid systems.
- Safe work practices must be implemented to avoid risks to the engineer and nearby individuals.
Freeing Seized Components
- Penetrating oil or other methods recommended in the AMM may be used to assist in removing seized fasteners or parts.
Safety procedures to follow when bringing an aircraft into a hangar, including clearance and precautions to take prior to entry.
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