As stated above, the ‘B’ refers to ‘B Conditions’ which are used to allow the flight testing of uncertificated or modified aircraft. A registered and certificated aircraft can be allowed to fly under certain circumstances without a valid Certificate of Airworthiness under what are termed ‘A Conditions’. Its all explained in British Civil Airworthiness Requirements (BCAR) Section A.
However, these rules now only apply to so-called Annex II or non-EASA aircraft types. Separate rules apply to aircraft certificated under the EASA regime, which is another reason for diminished use of ‘B Conditions’.
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