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Part-66 licence categories: A, B1, B2, B2L, B3, L and C explained

The Part-66 aircraft maintenance licence is divided into categories and subcategories that match the type of aircraft. Knowing which one applies helps engineers, students and independent certifying staff plan their path.

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The categories and subcategories

Category A and category B1 are split into turbine and piston aeroplanes and helicopters, with B1 also including B1.E for aeroplanes with an electric power plant and a maximum take-off mass below 5 700 kg. The B2 licence applies to all aircraft, while B2L applies to aircraft outside Group 1 and is split into system ratings (com/nav, instruments, autoflight, surveillance, airframe systems), with at least one rating required.

B3 covers piston-engine non-pressurised aeroplanes of 2 000 kg or less. Category L covers light aircraft, from L1 and L1C for sailplanes to L2 and L2C for powered sailplanes and ELA1 aeroplanes, and L3 to L5 for balloons and airships. The C licence applies to aeroplanes and helicopters.

Aircraft groups and ratings

For ratings, aircraft fall into four groups. Group 1 includes, for example, aeroplanes above 5 700 kg, jets, multi-turboprops and aircraft with fly-by-wire systems. Group 2 covers single turboprop aeroplanes, single-engine helicopters and electric aeroplanes; Group 3 covers other piston aeroplanes; Group 4 covers sailplanes, powered sailplanes, balloons and airships.

To certify on a given aircraft, the licence must be endorsed with the right rating: for B1, B2 and C, a type rating for Group 1 and type, subgroup or group ratings for the other groups; B2L, B3 and L licences use their own subgroup, group or category ratings.

Questions fréquentes

What is the minimum age for a Part-66 licence?

An applicant must be at least 18 years old. Applications are made on EASA Form 19.

Does the licence expire?

It becomes invalid 5 years after its last issue or change unless the holder submits it to the issuing authority for a records check. Certification privileges based on it lapse at the same time.

What recency is required to exercise privileges?

In the preceding 2 years, the holder must have had 6 months of maintenance experience matching the licence privileges, or have met the conditions for issue of those privileges, and must also be competent for the aircraft and able to understand the language of the technical documentation.

Pour les développeurs et les agents

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Branchez cette base à Claude, Cursor, ChatGPT ou votre propre application. Chaque requête API ou MCP coûte 0,10 €, débitée de votre crédit Kopik (non facturée si rien n'est trouvé). Il vous faut une clé API : créez-la depuis votre tableau de bord.

MCP pour vos agents

Adresse du serveur MCP de cette base (outils ask_base et search_base) :

URL MCP
https://kopik.io/api/mcp?base=eu-easa-continuing-airworthiness-ml-66
Claude Code, Cursor et autres clients
Claude Code
claude mcp add --transport http kopik-eu-easa-continuing-airworthiness-ml-66 "https://kopik.io/api/mcp?base=eu-easa-continuing-airworthiness-ml-66" --header "Authorization: Bearer kpk_…"
Configuration JSON (mcpServers)
{
  "mcpServers": {
    "kopik-eu-easa-continuing-airworthiness-ml-66": {
      "url": "https://kopik.io/api/mcp?base=eu-easa-continuing-airworthiness-ml-66",
      "headers": {
        "Authorization": "Bearer kpk_…"
      }
    }
  }
}

API REST pour vos applications

mode vaut "answer" (réponse rédigée + sources) ou "passages" (passages bruts seulement). Ajoutez un maxPriceCents facultatif pour plafonner le prix : si la base coûte plus cher, l'appel est refusé sans rien débiter.

curl
curl -X POST https://kopik.io/api/v1/bases/eu-easa-continuing-airworthiness-ml-66/query \
  -H "Authorization: Bearer kpk_…" \
  -H "Content-Type: application/json" \
  -d '{"question": "Votre question ici", "mode": "answer"}'

Pour commencer

  1. Créez une clé dans votre tableau de bord et rechargez votre crédit.
  2. Remplacez kpk_… par votre clé.
  3. Tout le détail (réponses, erreurs, exemples JS et Python) : documentation développeurs.