Independent Inspection

   Independent inspection is an inspection performed by an ‘independent qualified person’ of a task carried out by an ‘authorised person’, taking into account that: 

   (1) the ‘authorised person’ is the person who performs the task or supervises the task and they assume the full responsibility for the completion of the task in accordance with the applicable maintenance data;

     (2) the ‘independent qualified person’ is the person who performs the independent inspection and attests the satisfactory completion of the task and that no deficiencies have been found. The ‘independent qualified person’ does not issue a certificate of release to service, therefore they are not required to hold certification privileges;
     (3) the ‘authorised person’ issues the certificate of release to service or signs off the completion of the task after the independent inspection has been carried out satisfactorily;
    (4) the work card system used by the organisation should record the identification of both persons and the details of the independent inspection as necessary before the certificate of release to service or sign-off for the completion of the task is issued.

Qualifications of persons performing independent inspections  

 The organisation should have procedures to demonstrate that the ‘independent qualified person’ has been trained and has gained experience in the specific inspection to be performed. The organisation could consider making use of, for example:
     (1) staff holding a certifying staff or support staff or sign-off authorisation or equivalent necessary to release or sign off the critical maintenance task;
    (2) staff holding a certifying staff or support staff or sign-off authorisation or equivalent necessary to release or sign off similar task in a product of similar category and having received specific practical training in the task to be inspected; or
    (3) a commander holding a limited certification authorisation in accordance with 145.A.30(j)(4) and having received adequate practical training and having enough experience in the specific task to be inspected and on how to perform independent inspection.have undergone maintenance, the independent qualified person should consider the following points independently:
               (1) all those parts of the system that have actually been disconnected or disturbed should be inspected for correct assembly and locking;
               (2) the system as a whole should be inspected for full and free movement over the complete range;
               (3) cables should be tensioned correctly with adequate clearance at secondary stops;
               (4) the operation of the control system as a whole should be observed to ensure that the controls are operating in the correct sense;
               (5) if different control systems are interconnected so that they affect each other, all the interactions should be checked through the full range of the applicable controls; and
               (6) software that is part of the critical maintenance task should be checked, for example: version, compatibility with aircraft configuration.
Independent inspection is one possible error-capturing method.
AMC4 145.A.48(b) Performance of maintenance

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