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Part 66 and working for a Part 145 organisation

Your Part 66 Licence allows you to perform maintenance certifications for aircraft maintenance and issue the certificate of release to service (CRS) for aircraft. This performance of maintenance certifications and issue of CRS is bounded by the licence categories and aircraft type ratings endorsed on the licence. A LAME may perform maintenance certification or issue a CRS only if they do so in accordance with the privileges and conditions mentioned in the Part 66 Manual of Standards for the aircraft engineer licence or for any ratings endorsed on the licence.

Before you use your Part 66 Licence in a Part 145 Approved Maintenance Organisation (AMO) you must have also received a certification authorisation from the Part 145 AMO for those maintenance certifications and CRS the Part 145 wants you to perform and issue. There are also requirements for recent qualification or experience.

A LAME may perform maintenance certification or issue a CRS at a particular time only if, in the 2 years immediately before that time they were granted the aircraft engineer licence:

  • they have had at least 6 months experience of exercising the privileges mentioned in the Part 66 Manual of Standards for the licence or for a rating endorsed on the licence; or
  • met a requalification requirement for the licence.

In addition to the general requirements describe above:

  • A category A licence holder may perform maintenance certification for maintenance they have carried out on an aircraft or issue CRS after all category A maintenance is complete. This only applies if the maintenance is line maintenance mentioned in Appendix II to the Part 145 Manual of Standards (the Category A Licence Tasks Maintenance activities — Authority in Subcategory A1, A2, A3 or A4).
    In doing so they are performing the maintenance certification and issuing the CRS on behalf of a Part 145 organisation.
    Category A licence holders must first have completed training and assessment from the organisation and received a certification authorisation from the organisation to perform maintenance certifications/issue CRS for that line maintenance.
    Category A licence holders are not permitted to supervise maintenance.
  • A category B1 or B2 licence holder may perform maintenance certification on behalf of a Part 145 organisation for maintenance that was carried out on an aircraft for which they hold the appropriate category and any required aircraft type rating.  They may also provide CRS if the aircraft maintenance was in line maintenance (not base maintenance). This only applies if the licence is endorsed with the rating for the aircraft type; and the organisation has granted the licence holder a certification authorisation in relation to the aircraft type.
  • A category C licence holder may issue a CRS for an aircraft in relation to maintenance carried out on a large aircraft. This only applies if the maintenance is base maintenance and their licence is endorsed with the rating for the aircraft type. In doing so they are issuing the CRS on behalf of a Part 145 organisation.