Auxiliary Power Unit(APU) and Maintenance Syllabus Diploma in Aircraft Maintenance Engineering, Regulation 2010.
Objective
- To provide understanding of Basic requirement of APU.
- To understand the services provided by the APU.
- To familiarize with different types of constructional features of APU.
- To familiarize with the construction of APU.
- To identify different constructional materials.
- To understand the different systems of APU.
- To understand the fire protection system.
- To identify the cause of auto-shutdown of APU.
- To familiarize with different types troubleshooting of APU.
- To familiarize with different types maintenance of APU.
- To familiarize with storage procedure of APU.
Short Description:
Introduction to the basic requirements, principle of operation, constructional arrangement, different systems, maintenance, troubleshooting preservation and storage procedure of APU.
Detail Description
Theory
- Understanding of APU General Arrangement
1.1 Define modular design concept
1.2 Explain model numbering system
1.3 Describe mart numbering system
1.4 Discuss APU Data Plate
- Understanding of Power plant
2.1 Define APU air intake
2.2 Illustrate APU door actuation
2.3 Discuss inlet door actuator
2.4 Narrate inlet door proximity switch
2.5 Describe inlet door mechanism
2.6 Discuss exhaust door
- Understanding of Engine Description & Operation
3.1 General
3.2 Describe air inlet section
3.3 Explain compressor section
3.4 Discuss combustion section
3.5 Describe turbine section
3.6 Explain accessory drives
3.7 Discuss compressor control
3.8 Narrate APU mounts
3.9 Describe accessory/ bay cooling
3.9.1 Discuss noise suppressor
3.9.2 Explain accessory compartment cooling
3.10 Describe engine drains
- Understanding of lubricating System
4.1 General
4.2 Describe operation
4.3 Explain distribution
4.4 Discuss stores
4.5 Narrate indicating
- Understanding of Fuel Control
5.1 General
5.2 Describe distribution
5.3 Discuss controlling/limiting factors
5.4 Explain indicating
5.5 Describe operation
- Understanding of Ignition & Starting/ Ground Running
6.1 General
6.2 Discuss distribution
6.3 Describe operation
6.4 Explain cranking
- Understanding of Engine Speed Control
7.1 General
7.2 Describe power control
- Understanding of Indicating System
8.1 General
8.2 Describe power supply
8.3 Explain operation
- Understanding of Safety Features/Emergency Shutdown
9.1 Description
9.2 Other emergency shutdown
- Understanding of Load Control/ APU Air
10.1 General
10.2 Describe airflow
10.3 Discuss surge valve
10.4 Explain load bleed valve
10.5 Illustrate indicating system
- Understanding of APU Fire Protection & Indication
11.1 Operation
11.2 Explain APU fire extinguishing system
11.3 Describe Fire extinguisher containers
11.3.1 Discharge nozzle
11.3.2 Explain discharge cartridge
11.4 Describe fire extinguisher deployment lines
11.4.1 Describe check valve
11.4.2 Explain fire extinguisher discharge control
11.5 Discuss low pressure warning system
- Understanding of APU Generator & Electrical control
- Understanding of Storage Procedure
13.1 Describe short-term storage
13.2 Explain long-term storage
Typical Auxiliary Power Unit
- Understanding of Auxiliary Power Unit
14.1 General
14.2 Describe air intake duct
14.3 Explain exhaust duct
14.4 Discuss major components
14.4.1 Describe gas turbine assembly
14.4.2 Describe combustor assembly
14.4.3 Explain reduction drive assembly
14.4.4 Describe accessory drive assembly
14.5 Explain APU systems
14.5.1 General
14.5.2 Describe oil system
14.5.3 Explain fuel system
14.5.3.1 General
14.5.3.2 Discuss indication system
14.6 Explain APU Fuel Control Unit (FCU)
14.7 Describe ignition system
14.8 Discuss electronic sequence unit
14.9 Illustrate Build in Test Equipment (BITE)
14.10 Describe APU over-speed protection & test
14.11 Explain bleed air system
14.11.1 General
14.11.2 Explain start by-pass valve
14.11.3 Describe bleed valve
14.12 Explain starter generator
14.12.1 Description & operation
14.12.2 Describe starter operating limit
14.12.3 Discuss control and indication
14.12.4 Describe load monitoring
14.13 Explain fire protection
14.13.1 General
14.13.2 Describe fire extinguishing
14.13.3 Describe operation
14.13.4 Explain testing
14.13.5 Discuss thermal and system discharge
14.14 Describe APU compartment ventilation
14.15 Explain rear bay over temperature
14.16 Illustrate APU starting procedure
14.17 Describe APU shut down procedure
14.17.1 Describe normal APU shut down
14.17.2 Explain alternate APU shutdown
Practical
- Show skill in identifying of various sections of APU
- Show skill in identifying of various components of APU
- Show skill in removal/Installation of various accessories
- Show skill in removal/Installation of APU
- Show skill in troubleshooting
- Show skill in APU Servicing
Reference Books:
- CAIP, UK CAA
- Garott APU (F28 Aircraft Training Note ATA Chapter 49)
- Allied Signal A250 APU (A310 Airbus Aircraft Training Note ATA Chapter 49)
