B1.3 Licence Category Knowledge: Scope, Privileges and Certification
What the B1.3 category actually covers
A B1.3 licence is a maintenance certification privilege for aircraft in which the primary structure is largely of composite construction. It is often described as the "composite aeroplane" or "sailplane/motorglider" category, but the candidate must reason from the definition in the regulation, not from a mental list of types. The privilege is to issue certificates of release to service after maintenance, to certify completion of maintenance, and to act as support staff for base maintenance within the limits of the category and any type ratings or limitations endorsed.
Concepts to master
Understand the difference between a licence category (what you may certify), a type rating (the specific type you may certify), and a limitation (a restriction removing part of a privilege). Know the Part-66 style route: basic knowledge, basic experience, and the practical assessment; know how recent experience requirements keep a licence valid, and how a licence can be suspended, revoked or limited by the competent authority. Learn the boundary between B1 (mechanical, airframe, engine, electrical as installed) and B2 (avionics) privileges and the certification of complex tasks that must be referred to appropriately rated staff.
Traps in questions
- Confusing "composite construction" with "any aircraft containing composites". A metal aeroplane with composite fairings is not a B1.3 aircraft.
- Assuming a B1.3 holder may certify avionics systems; they may not, beyond the mechanical/electrical interface defined in the category.
- Forgetting that a type rating is required in addition to the category before certifying a specific type.
- Ignoring limitations printed on the licence; a limitation overrides a general privilege.
Rule of thumb
Category + type rating + current experience + no prohibiting limitation = privilege. If any element is missing, the certification is invalid. Worked example: a B1.3 licence holder with a type rating for a composite motorglider is asked to release a metal twin after a 100-hour check - they must decline, because the category does not cover that aircraft, regardless of experience.