Appendix VII Basic knowledge requirements for category L aircraft maintenance licence

AppendixAppendix

Appendix VIIBasic knowledge requirements for category L aircraft maintenance licence

The definitions of the different levels of knowledge required in this Appendix are the same as those set out in point 1 of Appendix I.

1.Modularisation The modules required for each aircraft licence subcategory/category shall be in accordance with the following matrix. Where applicable, the subject modules are indicated by an ‘X’, while ‘n/a’ means that the subject module is not applicable nor required. The basic knowledge requirement for L5 shall be the same as for any B1 subcategory (as indicated in Appendix I) plus other modules as shown in the matrix.

	Licence subcategories
	Composite sailplanes	Sailplanes	Composite powered sailplanes and composite ELA1 aeroplanes	Powered sailplanes and ELA1 aeroplanes	Hot-air balloons	Gas balloons	Hot-air airships	ELA2 gas airships	Gas airships above ELA2
Subject modules	L1C	L1	L2C	L2	L3H	L3G	L4H	L4G	L5
1L ‘Basic knowledge’	X	X	X	X	X	X	X	X	n/a
2L ‘Human factors’	X	X	X	X	X	X	X	X	n/a
3L ‘Aviation legislation’	X	X	X	X	X	X	X	X	n/a
4L ‘Wooden and/or metal-tube structure covered with fabric’	n/a	X	n/a	X	n/a	n/a	n/a	n/a	n/a
5L ‘Composite structure’	X	X	X	X	n/a	n/a	n/a	n/a	n/a
6L ‘Metallic structure’	n/a	X	n/a	X	n/a	n/a	n/a	n/a	n/a
7L ‘Airframe – general, mechanical and electrical systems’	X	X	X	X	n/a	n/a	n/a	n/a	n/a
8L ‘Power plant’	n/a	n/a	X	X	n/a	n/a	X	X	X ()
9L ‘Balloons – hot-air balloons’	n/a	n/a	n/a	n/a	X	n/a	X	n/a	n/a
10L ‘Balloons – gas (free/tethered) balloons’	n/a	n/a	n/a	n/a	n/a	X	n/a	X	X
11L ‘Airships – hot-air/gas AIRSHIPS’	n/a	n/a	n/a	n/a	n/a	n/a	X	X	X
12L ‘Radio Com/ELT/Transponder/ Instruments’	X	X	X	X	n/a	n/a	X	X	X

MODULE 1L – BASIC KNOWLEDGE

MODULE 1L – BASIC KNOWLEDGE	Level
1L.1 Mathematics — Arithmetic — Algebra — Geometry	1
1L.2 Physics — Matter — Mechanics — Temperature	1
1L.3 Electrics — AC and DC circuits	1
1L.4 Aerodynamics/aerostatics	1
1L.5 Workplace safety and environmental protection	2

MODULE 2L – HUMAN FACTORS

MODULE 2L – HUMAN FACTORS	Level
2L.1 General	1
2L.2 Human performance and limitations	1
2L.3 Social psychology	1
2L.4 Factors that affect performance	1
2L.5 Physical environment	1
2L.6 The ‘Dirty Dozen’ and risk mitigation	2

MODULE 3L – AVIATION LEGISLATION

MODULE 3L – AVIATION LEGISLATION	Level
3L.1 Regulatory framework	1
3L.2 Continuing airworthiness regulations	1
3L.3 Repairs and modifications (Part-ML)	2
3L.4 Maintenance data (Part-ML)	2
3L.5 Licence privileges and how to exercise them properly (Part-66, Part-ML)	2

MODULE 4L – WOODEN AND/OR METAL-TUBE STRUCTURE COVERED WITH FABRIC

MODULE 4L – WOODEN AND/OR METAL-TUBE STRUCTURE COVERED WITH FABRIC	Level
4L.1 Airframe wooden/combination of metal tube and fabric	2
4L.2 Materials	2
4L.3 Identifying damages and defects	3
4L.4 Standard repair and maintenance procedures	3

MODULE 5L – COMPOSITE STRUCTURE

MODULE 5L – COMPOSITE STRUCTURE	Level
5L.1 Airframe fibre-reinforced plastic (FRP)	2
5L.2 Materials	2
5L.3 Identifying damages and defects	3
5L.4 Standard repair and maintenance procedures	3

MODULE 6L – METALLIC STRUCTURE

MODULE 6L – METALLIC STRUCTURE	Level
6L.1 Metallic airframe	2
6L.2 Materials	2
6L.3 Identifying damages and defects	3
6L.4 Standard repair and maintenance procedures	3

MODULE 7L – AIRFRAME – GENERAL, MECHANICAL AND ELECTRICAL SYSTEMS

MODULE 7L – AIRFRAME – GENERAL, MECHANICAL AND ELECTRICAL SYSTEMS	Level
7L.1 Theory of flight – gliders and aeroplanes	1
7L.2 Airframe structure – gliders and aeroplanes	1
7L.3 Air conditioning (ATA 21)	1
7L.4 Electrical power, cables and connectors (ATA 24)	2
7L.5 Equipment and furnishing (ATA 25)	2
7L.6 Fire protection and other safety systems (ATA 26)	2
7L.7 Flight controls (ATA 27)	3
7L.8 Fuel system (ATA 28)	2
7L.9 Hydraulic power (ATA 29)	2
7L.10 Ice and rain protection (ATA 30)	1
7L.11 Landing gear (ATA 32)	2
7L.12 Lights (ATA 33)	2
7L.13 Oxygen (ATA 35)	2
7L.14 Pneumatic/vacuum (ATA 36)	2
7L.15 Water ballast (ATA 41)	2
7L.16 Fasteners	2
7L.17 Pipes, hoses and connectors	2
7L.18 Springs	2
7L.19 Bearings	2
7L.20 Transmissions	2
7L.21 Control cables	2
7L.22 Fits and clearances	2
7L.23 Aircraft weight and balance	2
7L.24 Workshop practices and tools	2
7L.25 Disassembly, inspection, repair and assembly techniques	2
7L.26 Abnormal events	2
7L.27 Maintenance procedures	2

MODULE 8L – POWER PLANT

MODULE 8L – POWER PLANT	Piston	Turbine	Electrical	Level
8L.1 General engine fundamentals	X	X	X	2
8L.2 Piston engine fundamentals and performance	X			2
8L.3 Piston engine construction	X			2
8L.4 Piston engine fuel system (non-electronic)	X			2
8L.5 Starting and ignition system	X			2
8L.6 Air intake, exhaust and cooling system	X			2
8L.7 Supercharging/turbocharging	X			2
8L.8 Lubrication systems of piston engines	X			2
8L.9 Engine indication systems	X	X	X	2
8L.10 Electric aircraft engines			X	2
8L.11 Turbine engine fundamentals and performance		X		2
8L.12 Inlet and compressor		X		2
8L.13 Combustion chamber, starting and ignition system		X		2
8L.14 Turbine section and exhaust		X		2
8L.15 Other turbine engine components and systems		X		2
8L.16 Turbine engine inspections and ground operation		X		2
8L.17 Propeller	X	X	X	2
8L.18 Full authority digital engine control (FADEC)	X	X	X	2
8L.19 Lubricants and fuels	X	X	X	2
8L.20 Engine and propeller installation	X	X	X	2
8L.21 Engine monitoring and ground operation	X	X	X	2
8L.22 Engine/propeller storage and preservation	X	X	X	2

MODULE 9L – BALLOONS – HOT-AIR BALLOONS

MODULE 9L – BALLOONS – HOT-AIR BALLOONS	Level
9L.1 Theory of flight – hot-air balloons	1
9L.2 General airframe of hot-air balloons	2
9L.3 Envelope	3
9L.4 Heater system/burner	3
9L.5 Basket and basket suspension (including alternative devices)	3
9L.6 Instruments	2
9L.7 Equipment	2
9L.8 Hot-air balloon handling and storage	2
9L.9 Disassembly, inspection, repair and assembly techniques	3

MODULES 10L – BALLOONS – GAS (FREE/TETHERED) BALLOONS

MODULES 10L – BALLOONS – GAS (FREE/TETHERED) BALLOONS	Level
10L.1 Theory of flight – gas balloons	1
10L.2 General airframe of gas balloons	2
10L.3 Envelope	3
10L.4 Netting	3
10L.5 Valves, parachutes and other related systems	3
10L.6 Load ring	3
10L.7 Basket (including alternative devices)	3
10L.8 Ropes and lines	3
10L.9 Instruments	2
10L.10 Tethered gas balloon (TGB) systems	3
10L.11 Equipment	2
10L.12 Gas balloon handling and storage	2
10L.13 Disassembly, inspection, repair and assembly techniques	3

MODULES 11L – AIRSHIPS – HOT-AIR/GAS AIRSHIPS

MODULES 11L – AIRSHIPS – HOT-AIR/GAS AIRSHIPS	Level
11L.1 Theory of flight and control of airships	2
11L.2 Airship airframe structure – general concepts	2
11L.3 Airship envelope	2
11L.4 Gondola	3
11L.5 Airship flight control (ATA 27/55)	3
11L.6 Electrical power (ATA 24)	3
11L.7 Lights (ATA 33)	2
11L.8 Ice and rain protection	3
11L.9 Fuel systems (ATA 28)	2
11L.10 Engine and propellers in airships	2
11L.11 Airship handling and storage	2
11L.12 Disassembly, inspection, repair and assembly techniques	2

MODULE 12L – RADIO COM/ELT/TRANSPONDER/INSTRUMENTS

MODULE 12L – RADIO COM/ELT/TRANSPONDER/INSTRUMENTS	Level
12L.1 Radio Com/ELT	2
12L.2 Transponder and FLARM	2
12L.3 Instruments	2
12L.4 Avionics general test equipment	1

APPENDIX · Appendix VII — Regulation (EU) No 1321/2014 · Regulation (EU) 2023/989 · Continuing Airworthiness Easy Access Rules · EAR revision 2 Sep 2025