Module 10.3 — Approved maintenance organisations: Part-145 and Part-CAO

Scope

10.3 is level 2 for all categories: "general understanding of Part-145 and Part-CAO". Most Part-145 questions test personnel roles, certification, records, components and the MOE.

Part-145 — who needs it?

Part-145 approval is needed to maintain complex motor-powered aircraft, aircraft used by licensed air carriers (commercial air transport) and their components. Light aircraft outside those uses can alternatively be maintained by a Part-CAO organisation or independent certifying staff (Part-ML).

Terms of approval and classes (145.A.20, Appendix II)

Class	Ratings	Meaning
A — Aircraft	A1 aeroplanes above 5 700 kg MTOM; A2 aeroplanes 5 700 kg and below; A3 helicopters; A4 other aircraft	Maintenance on the aircraft and components while fitted; each split into Base and/or Line maintenance
B — Engines	B1 turbine; B2 piston; B3 APU	Uninstalled engines/APUs and their components
C — Components	C1–C22 by ATA system (e.g. C1 air conditioning and pressurisation, C5 electrical power and lights, C8 flight controls, C14 landing gear)	Uninstalled components other than complete engines/APUs
D — Specialised services	D1 non-destructive testing	Only needed when NDT is done as a task for another organisation

The scope of work in the MOE defines the exact limits within the approved classes/ratings. Approval certificate: EASA Form 3-145. Application: EASA Form 2. Nominated persons are accepted via EASA Form 4.