MRO +MaintenanceMaintenance

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    MRO- Maintenance, Repair &

    OverhaulThe aircraft maintenance, repair and overhaul

    services will ensure optimal quality and

    reliability to achieve the highest quality forcommercial aircraft, engines and systems.

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    MRO- Maintenance, Repair & Overhaul

    Aircraft MROis the overhaul, repair,

    inspection or modification of an aircraft or

    aircraft component

    Maintenance includes the installation or

    removal of a component from an aircraft or

    aircraft subassembly, but does not include:

    Elementary work, such as spark plugs, checking

    cylinder compression, etc

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    Servicing, such as refueling, washing windows

    Any work done on an aircraft or aircraft

    component as part of the manufacturing process,

    prior to issue of a certificate of airworthiness orother certification document

    MRO- Maintenance, Repair & Overhaul

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    Types of Maintenance

    Each airline develops its own program, based

    on manufacturers planning documents, but

    includes adjustments for the airlines own

    operations

    Each aircrafts requires different operators and

    programs

    BUT, aircraft of the same number of routine

    maintenance hours during the program cycle

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    Maintenance of aircraft usually categorized

    into

    Product type (airframe, engine and components)

    Timing and purpose of work

    Then, resulted into 4 categories

    Routine scheduled maintenance

    Non-routine maintenance

    Refurbishments

    Modifications

    MRO- Maintenance, Repair & Overhaul

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    Routine scheduled maintenance

    Includes airframe and engine checks

    The most elementary is visual inspection of

    the aircraft before flight- walk-around

    To ensure there are no leaks, missing rivets or

    cracks

    Types of checks-In Grades Overnight

    A-Check

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    B-check

    C-check

    D-Check

    Overnight: Operate 1 to 1.5 hrs. inspection

    (End of working day) to ensure the plane

    operating in according to OEM s (Original

    Equipment Manufacturer) minimum list

    In, example installation of telephones and

    other devices

    7

    Routine scheduled maintenance

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    A-Check: Done after 125flight hours (2-3

    weeks)

    An amplified preflight visual inspection of plane's

    power plants, avionics and accessories

    B-Check: Done approximately after 175 flight

    hours (3 to 4 months)

    An open inspection for preventive maintenance(exterior wash, engine oil)

    Oils filters are removed and checked, parts are

    lubricated and carefully examined

    Routine scheduled maintenance

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    C-check: Carried out approximately for every

    3000 flight hours (15 months)

    Incorporates both A and B checks

    Components are repaired,

    Flights controls are calibrated

    Major internal mechanism are tested

    Other tests include minor structural inspections,

    compressor, flight control rigging tests, engine,

    compressor washes, aircraft appearance

    maintenance, and post-check flight tests

    Routine scheduled maintenance

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    D-Check: The most intensive, approximately

    20, 000 flights hours (6-8 years)

    Cabin interiors (including seats, galleys, lavatories,

    cockpit, furnishings, headliners and sidewalls) are

    removed to enable careful structural inspections

    Flights controls are examined and the fuel system

    is probed for leaks and cracks The aircraft is stripped to its shell and rebuilt to

    return it to its original con

    Routine scheduled maintenance

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    Non-routine Maintenance

    Done due to unforeseen event such as

    accident.

    An example of the first engine damage due to

    bird ingestion or an airframe dented by a

    catering truck

    Done also for an aging aircraft

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    Refurbishments

    Any form of upgrading of cleaning, brighting,

    or making it fresh again.

    To renovate and upgrade the aircraft

    For example: Cabin upgrades and exterior

    painting

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    Modifications

    Any form of small alteration, adjustment, or

    limitation to fulfill the aircrafts owner.

    Most modifications are carried out within the

    interior design, not much on the airframe and

    engine.

    For example: Installation of karaoke, PS3 and

    various kind of entertainment in the cabin

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    Overhaul of airframes

    A plan where a series of seven minor

    overhauls and one major check were

    conducted on aircraft

    The major overhaul was designed to rework

    the airplane to a like-new condition-to fit the

    bits and pieces back together to the exactness

    of current manufacturing tolerances

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    Overhaul of engines and other components

    Components are brought in when either

    operating time/ condition requires it

    The overhaul returns them to specifications

    laid down by engineering and manufacturer

    BUT when practical, engine changes are made

    during maintenance checks or airframe

    overhauls

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    Contract Maintenance

    When?

    When the airline do not have the personnel and

    equipment to perform maintenance

    When serving a distant airport at which they do nothave maintenance support

    Why?

    Different types of aircraft requires differentexpertise from different areas

    Low labor cost

    Important note:

    Some contracts extend to other functions such as