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If a company is part 145 certified wanted to do a major modification, can they do so without having A/Ps? Or does an A/P need to be present to verify/sign off? or no A/P's need to be present?

At that point who would do verifications (if the company was certified per 145)?

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    $\begingroup$ It seems painfully obvious to me that part of the 145 certification process would be ensuring and maintaining a requirement that only qualified mechanics perform the work. (perhaps with allowances for supervised apprentices...) Why do you think it would be another way? $\endgroup$
    – Michael Hall
    Commented Dec 16, 2022 at 19:53
  • $\begingroup$ What do you mean by "does an A/P need to be present to verify/sign off? If you meant that they need to be present the whole time during the modification/Repair then the answer is no. A mechanic without an A/P can do modification/repairs, but they need a certified mechanic to verify/sign off their work. $\endgroup$
    – Enzo C.
    Commented Dec 19, 2022 at 5:23

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You can likely find all the answers in 14 CFR Part 145 - Repair Stations.

But to provide a somewhat qualified and summarized answer to your question:

Per Subpart D - Personnel:

  • The stations is required to have an Accountable Manager, responsible to ensure an adequately trained and certificated staff is in place to do the work.
  • Supervisory personnel directly in charge of all the work to be done and which are required to be certificated as a mechanic or repairman under Part 65. Individuals performing the work under that supervision must be trained, but are not required to be certificated.
  • Properly trained inspection personnel.
  • A person certificated as a mechanic or repairman under Part 65 authorized to approve an article for return to service.
  • If they choose to use repairmen, they must certify that the each person recommended to receive a repairman certificate, a) Is employed by the station, and b) meets the eligibility of Part 65.101.

You might want to also review Part 65 Subpart D - Mechanics and Part 65 Subpart E - Repairmen to understand the difference.

As a note to the second bullet above; from § 145.3 Definition of Terms:

(c) Directly in charge means having the responsibility for the work of a certificated repair station that performs maintenance, preventive maintenance, alterations, or other functions affecting aircraft airworthiness. A person directly in charge does not need to physically observe and direct each worker constantly but must be available for consultation on matters requiring instruction or decision from higher authority.

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