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accordance with accepted industry practices and if special equipment or test apparatus is recommended by the aircraft manufacturer involved, they use that equipment or apparatus or its equivalent acceptable to the 121 certificate holder and the Administrator.  (Ref. §§ 43.13(a), 91.403(b), 121.367(a) and (b), 121.369(b)(5).


Ensuring the certificate holder’s periodic inspection and calibration of precision tools measuring devices and test equipment procedures, standards, and limits for the performance of the work that it has made arrangements with an outsource maintenance provider to perform, are met. (Ref. §§121.367, 121.369(b)(5).)


Ensuring the duty time limitations of § 121.377 are met for persons used by the certificate holder to perform maintenance. (Any outsource maintenance provider.)  


Determining that the training requirements of § 121.375 are met by the certificate holder’s or the outsource maintenance providers training program.


Ensuring the certificate holder’s procedures for preparing an airworthiness release or appropriate entry in the aircraft log are followed after maintenance, preventive maintenance or alterations have been performed on an aircraft by an outsource maintenance provider. (Ref. § 121.709(b)(1).)


Ensuring the certificate holder has all the records from maintenance providers required for the issuance of an airworthiness release has been met before the aircraft is released to service. (Ref. § 121.380.)


Performing receiving inspections on products that outsource maintenance providers have performed work on.  These inspections should include a review of a tear-down or build-up report to ensure airworthiness directive compliance and the procedures and standards for the certificate holder’s inspections, checks, service, repair, and/or preventive maintenance, checks, or tests prescribed in its manual were met.  Also, that the component parts, accessories, or appliances are maintained in an airworthy condition in accordance with the time limits for the accomplishment of the overhaul, replacement, periodic inspection, and routine checks of the aircraft and its component parts, accessories, and appliances.  (Ref. § 121.367.)


When a certificate holder makes arrangements with a person to perform work that does not have the authority under § 43.7 to approve an aircraft, airframe, aircraft engine, propeller, appliance, or component part for return to service for the work they performed, the certificate holder must approve it for return to service under the authority of § 121.379 or have it approved for return to service by a person authorized by § 43.7 as applicable.  In either case, the certificate holder must have a control in place to ensure the work was performed IAW the requirements of its CAMP and maintenance manual.  The certificate holder’s manual must include the instructions and information necessary for personnel to determine the adequacy of the work performed for the approval for return to service of an aircraft, airframe, aircraft engine, propeller, appliance, or component part that has undergone this type of maintenance. (Ref. §§ 91.407(a)(1), 121.135(a)(1), 121.367(a), 121.379(a) and (b).)


When a certificate holder requests authorization to have an organization perform SUBSTANTIAL MAINTENANCE for them, they must request an amendment to their OpSpecs (Opspec D091).  



A.Comment Fields:

(1)Inspectors will validate the overall effectiveness of their assigned certificate holders’ management and oversight of outsourced maintenance.

(2)All comments should be written in clear, concise language.  Explanations should be complete and descriptive, with as much information as necessary for other CMT members to understand the comments without requiring further information from the inspector.  Comments submitted should include who, what, where, when, why, and how.  References should be entered when appropriate.

B.EPI Recording:  Enter all the information you have available from each activity.  At a minimum, every inspection activity should include Activity Start Date, Activity End Date, and Departure Point/Location.  If the inspection activity involves an aircraft, the registration number and make, model, and series should be entered.  Record the results of the evaluation and any discrepancies found in the PTRS or ATOS program.  

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