Systems of Maintenance Flashcards
Before a Class “A” aircraft or aeroplane can be used for transport operations in Australia, what must it have?
A CASA approved System of Maintenance (SoM) for its airframe, engines and components
What is a SoM?
Systems of Maintenance.
A set of preventative maintenance tasks determined from MSG-3 processes and outlined in the MRB Document or the MPD as well as a number of corrective maintenance tasks, servicing tasks, reliability monitoring tasks and improvement actions/modifications that keep an aircraft airworthy
Do class B aircraft require a SoM? Why/why not?
No.
They are maintained differently and can be flown or operated only as private aircraft provided that maintenance has been carried out in accordance with the aircraft Manufacturer’s Maintenance Schedule or a CASA Maintenance Schedule. (CAR41).
When would a class B aircraft require a SoM
When it begins to operate comercially
Who is responsible for the SoM?
AOC Holder
What is in the SoM?
- An Aircraft Maintenance Program, which states the times at which specified regular maintenance inspections and preventative maintenance tasks are to be carried out on the aircraft and its systems.
- Scheduled program of inspection tasks, tests and checks and the procedures for carrying them out
- Schedule for removal of time-lifted components
- How inspections are to be carried out irregularly if the aircraft is subject to abnormal loads or lightning strike
- A list of the MELs that are applicable to the aircraft
- Maintenance tasks resulting from reports of discrepancies/defects on the aircraft which require rectification
- How AD’s, SBs, ALIs and CMRs are to be incorporated on the aircraft.
- Name of aircraft registration holder
- A Reliability Monitoring Program with procedures for improving the System of Maintenance from reliability data analysis
Define the work packs of the SoM?
Skills, methods, facilities, equipment and tools to be used by the persons carrying out the maintenance
What is in line maintenance?
- Receipt of Aircraft
- Pre-Flight or Transit
- Service Check
- “A” Check
- Special Checks such as APU checks, OSIP or Flt. Readiness Checks
- At such times, opportunities are taken to rectify any deferred passenger or crew complaints and incorporate some market driven modifications, Airworthiness Directives or Service Bulletins. These tasks are incorporated into the Work pack
What are the 5 basic component items on a plane?
- Consumable item
- Expendable item
- Repairable item
- Rotatable assembly or part
- Life limited part
What are consumable items?
Gaskets or seals tend to be a single use items that wear out quickly and are scrapped after they are removed.
What are expendable items?
Bolt or rivet fasteners and cables etc can continue to be used for some time after checking for wear and are expended only when they become unserviceable. They are not usually repairable.
What are repairable items?
usually single items such as compressor blades or turbine blades, access panels and seats. They can be removed and repaired a number of times and returned to service. Rotables however, like repairables can be repaired but tend to be high cost assemblies like Pumps, Hydraulic Actuators, AC Packs, Starter Motors etc rather than just single items. They are rarely scrapped and are usually zero timed after repair so that they can be reworked often
What are life limited parts?
engine disks, shafts, etc must be removed from service after a given fixed time (8,000 cycles for disks). They can be repaired during their life but the life limit is not extended as a result of the repair
What is a RMP?
Reliability Maintenance Program
What is the purpose of using a RMP?
To ensure inherent Safety and Reliability levels are realised
• To restore Safety & Reliability to their inherent levels when deterioration has occurred
• To obtain the information necessary for optimisation of maintenance program when inherent levels are not met
• To create opportunities for design improvement
• To accomplish Safety & Reliability at minimum total cost
