154. Definitions -(a) In this Part "Engineering and Inspection" refer to performance of all work necessary for ensuring airworthiness and safety of the aircraft, including overhaul, maintenance, modification, repair, replacement, manufacture, assembly, testing, treatment, inspection and certification.

(b) In this part, 'manual' refers to 'Operators' Maintenance System Manual' or 'Operators' Quality Control Manual' or any other manual covering such requirements as the case may be.