Yes, clause 6.1.5 requires the IB to have a documented procedure for authorising all personnel involved in inspection activities. That would include the Technical Manager. The procedure developed under 6.1.5 would provide the specific details for how this would apply to the Technical Manager.
How can a very small inspection body, e.g. a one-man inspection body, fulfil the requirement for authorising inspectors and other personnel involved in inspection activities?
STANDARD: ISO/IEC 17020 · CLAUSE: 6.1.5 · TOPIC: Authorising inspectors and other personnel involved in inspection activities
Answer:
This is not a problem limited to small inspection bodies. No matter how many employees, the first person has to be self-authorized or authorized by somebody who is not authorized himself/herself.