Aircraft Maintenance

BY : ESSAM DARWEESH ESSAM FAWAZ20090569

Aircraft Maintenance

HTIMechanical

Dep.

20/12/2016 Aircraft Maintenance

Supervised by/ Dr. Manal AminEng. Mohammed Fathy

Overview


IntroductionMaintenance classification.Inspection.Maintenance levels.Servicing & cleaning.Preservation & de-reservation.

Introduction


Data and maintenance routines will be shown are similar to global aviation maintenance.

Aviation engineering and aircraft maintenance start from studying the components of each part.

Aircraft maintenance like any maintenance-line routine.

Protection and checks on systems need to study the whole system.

There are two main types of maintenance…

Maintenance practices


Maintenance Practices are classified into :

Protective Maintenance.A. Inspection

o Daily inspection.o Periodical inspection.

B. Servicing

Corrective Maintenance.

Checks & Protection


Protection against ice formation De-icing system. Anti-ice system.

De-icing system Anti-icing system

Checks & Protection


Aircraft fuel system Regulation wise. Ram air functions:

Pressurization of fuel tanks. Replacing the used fuel with air

Fuel Temperature control.

Checks & Protection


Protecting the engine compartment from over pressure

Checks & Protection


Visual inspection.Checks on the engine before take-off.Compressor.Bearings.Oil systems.

In-Line Checks


Pre departure check (PDC)

After departure Check(ADC)

Engine Lifetime


There are two parameters give the time of maintenance :

1. Hard time.2. Cycles.

1.Hard Time


The time between overhauls.The total number of flight hours that the

engine can make before it is entered into the overhaul maintenance.

The hard time specified by the manufacturer

2.Cycles


Depend on the material used in building the engine.

Number of cycles are fixed for a given material.

Conditions for the one cycle


1. Starting the engines, take off, maximum climb, cruise, idle, landing, shutting down the engines.

2. Reaching to high powers.3. The engines are used to move the aircraft

from one location to another.

Lifetime Of Such Types Of Aircraft


Life (in hours) Life (in cycles) Life (in years) Aircraft Type

60000 36000 20 Airbus-300

60000 35000 20 Airbus-310

51000 75000 20 Boeing-737

-- 100000 40 Boeing-757

Lifetime Determining


1. On condition Inspection after each flight. Only the module that has the problem will go

maintenance not the engine as a block.2. Engine condition monitoring (ECM)

Continuous monitoring of key engine parameter. Uses standard engine and aircraft instrumentation

for monitoring. No additional measurement equipment is needed.

Engine Condition Monitoring


The Figure shows sensors and parameters that show results on ECM

Maintenance Categories For Engines


Level A1 On engine installed on-wingLevel BOn uninstalled engineLevel CRepairing partsLevel D1On accessories, pumps, starter, generator,Level T1Engine testing



Level B

Level B1

Level A1 Hot section inspection

Replacement of (Fan, LPT,HPT)

Level B2

Engine modules are disassemble

d

Replacement of

bearings

Replacement parts without

disassembling

Level B3



Level C

Level C1

Repair parts by

using hand tools

Sheet metal work

Level C2 Level C3

Maintenance sence


Engineering sence, experience, and instructions of the maintenance manual are very important in making correct servicing.

Maintenance sence


Very Dangerous Less Dangerous

Example

Engine Cleaning


Carbo Blast• Engine is turned on at idle speed.• Detergent is sprayed into the engine

intake.Water Washing• Sealing any openings to engine

components.• Engine is rotated by dry cranking.• Water is sprayed into the engine

intake.

Preservation Routine


Storing engine for

less than 90 days

All openings must be closed

Silica gel put inside the

engine

Humidity must be

monitored

Storing engine more than 90 days

Same steps

Fuel paths must be

evacuated from fuel and filled with oil

De reservation Routine


Removing the cover from all

openingsRestoring

the correct oil level in

the oil tanks

Replacing oil with fuel

in fuel paths

Conclusion


Aircraft engineering and maintenance need to be familiar with any components in aircraft.

No way for any default in maintenance whether in preventive or corrective maintenance routine.

Maintenance of aircraft classified into levels.Determining lifetime of the aircraft is very

important.

Discussion



Thank you !

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Aircraft Maintenance