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.



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



– 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




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



• 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



– 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




• 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




• 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




• 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 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

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