• Aircraft that do not have a valid Certificate of Airworthiness (CofA) or Restricted CofA (RCofA) but are capable of safe flight under defined conditions may be eligible for a Permit to Fly (PtF) under UK Part 21 Subpart P.
    A PtF is generally required when the aircraft is capable of performing safe flight but its CofA (or RCofA) cannot be issued or is temporarily invalidated.

    The PtF can be issued by the UK CAA or a UK Design, Production or continuing Airworthiness Management Organisation with appropriate competence and privilege. Refer to the Permit to Fly page for PtF applications. For a PtF to be issued, the safe condition of the aircraft must first be established. We may put in place restrictions on a permit to maintain an acceptable level of safety. 

    The configuration(s) for which the Permit to Fly is requested, any conditions or restrictions necessary for safe operation of the aircraft, their substantiation and the method for controlling the aircraft configuration in order to remain within the established conditions are termed 'Flight Conditions'. 

    The establishment and approval of Flight Conditions on a G-registered aircraft is done either by the UK us or a UK design organisation with appropriate competence and privilege. When approved by us, we will complete a CAA Form 18B to confirm the approval of safety design-related Flight Conditions. 

    The approval of Flight Conditions is related to the safety of the design when:

    • The aircraft does not conform to an approved design, such as when compliance with airworthiness requirements has yet to be demonstrated; or
    • The result of damage to the aircraft beyond applicable limits; or
    • When the aircraft does not comply with the essential requirements for airworthiness (e.g. non-compliance with an Airworthiness Directive (AD), Mandatory Service Bulletin (SB), Airworthiness Limitations, Airworthiness Limitation Items (ALIs), Certification Maintenance Requirement (CMR/Critical Design Control Limitations (CDCCL) or expiry of a life limited part); or 
    • The intended flight(s) is (are) outside of the approved envelope; or
    • The Permit to Fly is issued for the purpose of 21.A.701(a)(15)(note that only the aircraft owner can apply for this PtF purpose)

    When the approval of Flight Conditions is not related to the safety of the design, refer to the guidance on the Permit to Fly page. 

    Eligibility

    Anyone may apply for our approval of safety of design-related Flight Conditions.

    How to apply

    When the approval of Flight Conditions is related to the safety of the design, an application is made using CAA Form SRG1767 and completion of CAA Form 18B.

    Application guidance for approval for of Flight Conditions not related to the safety of the design can be found on the Permit to Fly page. 

    Approval process

    Applicant
    responsible
    for
    CAA
    responsible
    for
    Activity
    x  

    Submit an application on CAA Form SRG1767 and a CAA Form 18B with Blocks 1 through to 12 completed.

    Block 6 of the CAA Form 18B will detail the aircraft configuration, including in what way(s) the aircraft does not comply with the applicable airworthiness requirements. 

    Block 7 of the CAA Form 18B will detail the substantiation that the aircraft can fly safely and Block 8 will detail any conditions or restrictions

    x x

    CAA will review the data presented on the CAA Form 18B and consider the conditions for safe flight, particularly the detail in Blocks 7 and 8

    CAA may require the Applicant to re-submit the Form 18B if amendments to substantiation or conditions/restrictions are required.

      x CAA will complete Block 13 of the CAA Form 18B and return to the Applicant. This constitutes the approval of the Flight Conditions.
    X   Applicant uses the completed CAA Form 18B to support its application for a PtF.


    UK-EU transition additional guidance

    Permits to Fly (PtF) are a State of Registry responsibility. A PtF is issued in accordance with (UK/EU) Part 21 Subpart P. Any natural or legal person can apply (no nationality restrictions) for the approval of Flight Conditions (FC) or the issuance of a PtF:

    • UK 21J organisations can apply to EASA for approval of safety of design-related FC on EU Member State registered aircraft (or support applications from other natural or legal persons).
    • UK 21J organisations can apply to the relevant State of Registry National Aviation Authority (NAA) for the approval of non-safety design-related FC or issue of a PtF on EU Member State aircraft (or support applications from other natural or legal persons).
    • EASA 21J organisations can apply to the UK CAA for approval of FC or issue of a PtF on G-registered aircraft (or support applications from other natural or legal persons)

    State of Registry NAAs issue a PtF on the basis of approved Flight Conditions. Consequently: 

    • In accordance with UK Part 21, only the UK CAA or UK 21J approved design organisations can approve FC for G-registered aircraft.
    • In accordance with EU Part 21, only EASA (for safety of designed related FC) or State of Registry NAA (for non-safety of design related FC) or EASA 21J design approved organisations can approve FC for EU Member State registered aircraft. 

      In summary:
    • UK 21J organisations cannot use privileges on non-G-registered aircraft.
    • EASA 21J organisations cannot use privileges on non-EU-registered aircraft.

    The PtF holder should be the one operating the aircraft under the PtF. A PtF is a domestic document. Permission of local NAA(s) is required for performing flight(s) outside the State of Registry airspace.