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4.3 Independent inspections should be carried out by at least two persons, to ensure correct assembly, locking and sense of operation. A technical record of the inspections should contain the signatures of both persons before the relevant CRS is issued.
4.3.1  An independent inspection is an inspection first made by  an authorised person signing the maintenance release who assumes full responsibility for the
Rev 0, dated 2nd March, 2010 satisfactory completion of the work, before being subsequently inspected by a second independent competent person who attests to the satisfactory completion of the work recorded and that no deficiencies have been found.
4.3.2  The second independent competent person is not issuing a maintenance release therefore is not required to hold certification privileges.  However they should be suitably qualified to carry out the inspection.
4.4  When work is being done under the control of an approved  maintenance organization the organisation should have procedures to demonstrate that the signatories have been trained and have gained experience on the specific control systems being inspected.
4.5.  When work is being undertaken by an independent M.A.801 (b) 2 certifying staff, the qualifications and experience of the second independent competent person should be directly assessed by the person certifying for the maintenance, taking into account the individual’s training and experience. It should not be acceptable for the certifying staff signing the release to show the person performing the independent inspection how to perform the inspection at the time the work is completed.
4.6  In summary the following maintenance tasks should primarily be considered when inspecting aircraft control systems that have been disturbed:
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installation, rigging and adjustment of flight controls.

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installation of aircraft engines, propellers and rotors.

.  overhaul, calibration or rigging of components such as engines, propellers, transmissions and gearboxes.
Consideration should also be given to:
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previous experience of maintenance errors depending on the consequences of the failure.

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information arising from an ‘occurrence reporting system’

4.7  When checking control systems that have undergone maintenance the person signing the maintenance release and the person performing the independent check should consider the following points independently:
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all those parts of the system that have actually been  disconnected or disturbed should be inspected for correct assembly and locking.

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the system as a whole should be inspected for full and free movement over the complete range.

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cables should be tensioned correctly with adequate clearance at secondary stops.

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the operation of the control system as a whole should be observed to ensure that the controls are operating in the correct sense.

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if the control system is duplicated to provide  redundancy, each system should be checked

Rev 0, dated 2nd March, 2010 separately.
.  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.
AMC M.A.402 (b) Performance of maintenance
When performing maintenance, personnel are required to use the tools, equipment and test apparatus necessary to ensure completion of work in accordance with accepted maintenance and inspection standards. Inspection, service or calibration on a regular basis should be in accordance with the equipment manufacturers' instructions. All tools requiring calibration should be traceable to an acceptable standard.
If the organisation responsible for the type design involved recommends special equipment or test apparatus, personnel should use the recommended equipment or apparatus or equivalent equipment accepted by DGCA. All work should be performed using materials of such quality and in a manner, that the condition of the aircraft or its components after maintenance will be at least equal to its original or modified condition (with regard to aerodynamic function, structural strength, resistance to vibration, deterioration and any other qualities affecting airworthiness).
　
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