www.easaonline.com presents the different categories available within the EASA Part 66 license
On the basis of the Maintenance Engineers License, together with a satisfactory demonstration of competency and knowledge of organizational procedures, the personal authorization document is issued by an approved Part-145 organization.
Note - Whilst Category A is not maybe the best choice to sit for your license, clearly as it is incorporated within the B1 license it can be of significant benefit to allow the B1 Engineer to be task trained on multiple aircraft.
A Category “A” License holder may only certify his (or her) own work and cannot certify the work of other individuals.
The Category “A” based approval is a task-based approval that is restricted to the mechanical systems, although simple and limited avionic tasks for example which may be found on a daily inspection or a weekly check, can be included with the approval of the Competent Authority.
(b) Categories A and B1 are subdivided into subcategories relative to combinations of Aeroplanes, helicopters, turbine and piston engines.
These subcategories are:
— A1 and B1.1 Aeroplanes Turbine
— A2 and B1.2 Aeroplanes Piston
— A3 and B1.3 Helicopters Turbine
— A4 and B1.4 Helicopters Piston
Category “B1” & “B2”
The Basic “B1” & “B2” Licenses alone, do not convey certification rights, an aircraft type rating needs to be added to the License, prior to the holder gaining authorization. (but note that a B1 License (only) includes the privileges of a Category “A” License. So it is possible for the BI not holding a Type rating to have limited approval on a particular Aircraft Type (using the privilege of the “A” license!
On the basis of the “B1” And “B2” Maintenance Engineers License, together with Type Training and Rating plus satisfactory demonstration of required practical experience plus competency and knowledge of organizational procedures, the personal authorization document is issued by an approved Part-145 organization.
The privileges of a “B1” typically include Certification privileges on aircraft structures, power plants, mechanical systems, and electrical systems. Including the replacement of avionic line replaceable units (LRUs) requiring simple tests to prove serviceability. Either by the use of BITE (Built-in Test Equipment).
The privileges of “B2” typically include certification privileges on Aircraft Electrical and Avionic systems.
Category B3 applies to piston-engine non-pressurized airplanes of 2,000 kg MTOM and below. A category B3 aircraft maintenance License shall permit the holder to issue certificates of release to service and to act as B3 support staff for:
Maintenance performed on airplane structure, powerplant, and mechanical and electrical systems,
— work on avionic systems requiring only simple tests to prove their serviceability and not requiring troubleshooting.
Category C
The Basic C License alone, Basic License alone, does not convey certification Rights, An aircraft type rating needs to be added to the License prior to the holder gaining authorization.
“C” Licensed Rating can certify Base Maintenance which consists of large checks – usually “C” checks and above. A single signature releases the aircraft from Base Maintenance check which may contain some 1000’s of tasks. During base maintenance, the individual tasks that are signed for are not certifications merely a record of who has completed the task. Normally the company will identify what people are allowed to sign for during base maintenance and it will be demonstrated on the individual's approval certificate.
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