This document discusses aircraft maintenance practices. It covers maintenance classification including inspection, servicing, preservation, and different maintenance levels. It also addresses aircraft systems checks, engine lifetime determination based on hours and cycles, and engine condition monitoring. Maintenance categories for engines including on-wing, modular, and parts-level repair are defined. Finally, the document outlines engine cleaning, preservation routines for short and long-term storage, and depreservation routines when putting an aircraft back into service.

1. B Y : E S S A M D A R W E E S H E S S A M F A W A Z
2 0 0 9 0 5 6 9
Aircraft Maintenance
HTI
Mechanical Dep.
20/12/2016 Aircraft Maintenance
Supervised by/ Dr. Manal Amin
Eng. Mohammed Fathy

2. Overview
1/12/2016Aircraft Maintenance
 Introduction
 Maintenance classification.
 Inspection.
 Maintenance levels.
 Servicing & cleaning.
 Preservation &
de-reservation.

3. Introduction
1/12/2016Aircraft Maintenance
 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…

4. Maintenance practices
1/12/2016Aircraft Maintenance
 Maintenance Practices are classified into :
 Protective Maintenance.
A. Inspection
o Daily inspection.
o Periodical inspection.
B. Servicing
 Corrective Maintenance.

5. Checks & Protection
1/12/2016Aircraft Maintenance
 Protection against ice formation
 De-icing system.
 Anti-ice system.
De-icing system Anti-icing system

6. Checks & Protection
1/12/2016Aircraft Maintenance
 Aircraft fuel system
 Regulation wise.
 Ram air functions:
 Pressurization of fuel tanks.
 Replacing the used fuel with air
 Fuel Temperature control.

7. Checks & Protection
1/12/2016Aircraft Maintenance
 Protecting the engine compartment from over
pressure

8. Checks & Protection
1/12/2016Aircraft Maintenance
 Visual inspection.
 Checks on the engine before take-off.
 Compressor.
 Bearings.
 Oil systems.

9. In-Line Checks
1/12/2016Aircraft Maintenance
Pre departure check
(PDC)
After departure
Check
(ADC)

10. Engine Lifetime
1/12/2016Aircraft Maintenance
 There are two parameters give the time of
maintenance :
1. Hard time.
2. Cycles.

11. 1.Hard Time
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 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

12. 2.Cycles
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 Depend on the material used in building the engine.
 Number of cycles are fixed for a given material.

13. Conditions for the one cycle
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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.

14. Lifetime Of Such Types Of Aircraft
1/12/2016Aircraft Maintenance
Life (in hours)Life (in cycles)Life (in years)Aircraft Type
600003600020Airbus-300
600003500020Airbus-310
510007500020Boeing-737
--10000040Boeing-757

15. Lifetime Determining
1/12/2016Aircraft Maintenance
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.

16. Engine Condition Monitoring
1/12/2016Aircraft Maintenance
The Figure shows sensors and parameters that show results on ECM

17. Maintenance Categories For Engines
1/12/2016Aircraft Maintenance
 Level A1
On engine installed on-wing
 Level B
On uninstalled engine
 Level C
Repairing parts
 Level D1
On accessories, pumps, starter, generator,
 Level T1
Engine testing

18. Maintenance Categories For Engines
1/12/2016Aircraft Maintenance
Level
B
Level
B1
Level A1
Hot section
inspection
Replacement
of (Fan,
LPT,HPT)
Level
B2
Engine
modules are
disassembled
Replacement
of bearings
Replacement
parts without
disassembling
Level
B3

19. Maintenance Categories For Engines
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Level C
Level C1
Repair parts
by using
hand tools
Sheet metal
work
Level C2 Level C3

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

21. Maintenance sence
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Very Dangerous Less Dangerous

22. Engine Cleaning
1/12/2016Aircraft Maintenance
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.

23. Preservation Routine
1/12/2016Aircraft Maintenance
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

24. De reservation Routine
1/12/2016Aircraft Maintenance
Removing the
cover from all
openings
Restoring the
correct oil
level in the oil
tanks
Replacing oil
with fuel in
fuel paths

25. Conclusion
1/12/2016Aircraft Maintenance
 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.

26. Discussion
1/12/2016Aircraft Maintenance

27. 1/12/2016Aircraft Maintenance
Thank you ! 