MRO- Maintenance, Repair & Overhaul The aircraft maintenance, repair and overhaul services will ensure optimal quality and reliability to achieve the highest quality for commercial aircraft, engines and systems.

MRO- Maintenance, Repair & Overhaul Aircraft MRO is 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

MRO- Maintenance, Repair & Overhaul 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 or other certification document

Types of Maintenance Each airline develops its own program, based on manufacturer’s planning documents, but includes adjustments for the airline’s own operations Each aircrafts requires different operators and programs BUT, aircraft of the same number of routine maintenance hours during the program cycle

MRO- Maintenance, Repair & Overhaul 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

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

Routine scheduled maintenance 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

Routine scheduled maintenance 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 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 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

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

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

Modifications Any form of small alteration, adjustment, or limitation to fulfill the aircraft’s 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

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

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

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 not have maintenance support Why? Different types of aircraft requires different expertise from different areas Low labor cost Important note: Some contracts extend to other functions, such as cleaning and fueling the aircraft