Section 135.427 - Manual requirements(a) Each certificate holder shall put in its manual the chart or description of the certificate holder's organization required by § 135.423 and a list of persons with whom it has arranged for the performance of any of its required inspections, other maintenance, preventive maintenance, or alterations, including a general description of that work.(b) Each certificate holder shall put in its manual the programs required by § 135.425 that must be followed in performing maintenance, preventive maintenance, and alterations of that certificate holder's aircraft, including airframes, aircraft engines, propellers, rotors, appliances, emergency equipment, and parts, and must include at least the following:(1) The method of performing routine and nonroutine maintenance (other than required inspections), preventive maintenance, and alterations.(2) A designation of the items of maintenance and alteration that must be inspected (required inspections) including at least those that could result in a failure, malfunction, or defect endangering the safe operation of the aircraft, if not performed properly or if improper parts or materials are used.(3) The method of performing required inspections and a designation by occupational title of personnel authorized to perform each required inspection.(4) Procedures for the reinspection of work performed under previous required inspection findings (buy-back procedures).(5) Procedures, standards, and limits necessary for required inspections and acceptance or rejection of the items required to be inspected and for periodic inspection and calibration of precision tools, measuring devices, and test equipment.(6) Procedures to ensure that all required inspections are performed.(7) Instructions to prevent any person who performs any item of work from performing any required inspection of that work.(8) Instructions and procedures to prevent any decision of an inspector regarding any required inspection from being countermanded by persons other than supervisory personnel of the inspection unit, or a person at the level of administrative control that has overall responsibility for the management of both the required inspection functions and the other maintenance, preventive maintenance, and alterations functions.(9) Procedures to ensure that required inspections, other maintenance, preventive maintenance, and alterations that are not completed as a result of work interruptions are properly completed before the aircraft is released to service.(10) Policies, procedures, methods, and instructions for the accomplishment of all maintenance, preventive maintenance, and alterations carried out by a maintenance provider. These policies, procedures, methods, and instructions must be acceptable to the FAA and ensure that, when followed by the maintenance provider, the maintenance, preventive maintenance, and alterations are performed in accordance with the certificate holder's maintenance program and maintenance manual.(c) Each certificate holder shall put in its manual a suitable system (which may include a coded system) that provides for the retention of the following information- (1) A description (or reference to data acceptable to the Administrator) of the work performed;(2) The name of the person performing the work if the work is performed by a person outside the organization of the certificate holder; and(3) The name or other positive identification of the individual approving the work.(d) For the purposes of this part, the certificate holder must prepare that part of its manual containing maintenance information and instructions, in whole or in part, in printed form or other form, acceptable to the Administrator, that is retrievable in the English language.Doc. No. 16097, 43 FR 46783, Oct. 10, 1978, as amended by Amdt. 135-66, 62 FR 13257, Mar. 19, 1997; 69 FR 18472 , Apr. 8, 2004; Amdt. 135-118, 74 FR 38522 , Aug. 4, 2009; Docket FAA-2011-1136, Amdt. 135-132, 80 FR 11547 , Mar. 4, 2015