31 July 2011 C1 CIVIL AVIATION DEPARTMENT HONG KONG ...

one aircraft type or comparable tasks on different aircraft typesperiods of validity not exceeding three years.(b)(c)(d)Checks to determine serviceability must not require anything other thanoperational checks, simple functional tests or the use of Built in TestEquipment (BITE). On non-complex systems simple general testequipment may be used.Responsibility for the determination of serviceability in relation to aLimited Authorisation task rests solely with the person authorised.This cannot be fulfilled by a presumption of the competence of any otherperson therefore the signatory can only certify for tasks they havepersonally performed, or in the situation described in Paragraph 2.2,have personally seen performed.Formal training, including on the job training (OJT) on the specific taskto be authorised, will always be necessary for the grant/extension of aLimited Authorisation. Periodic continuation or refresher training willbe required in order to revalidate the Authorisation. A record of suchtraining must be maintained.2 Assessment of Tasks and Criteria for the Issue of Limited Authorisation2.1 The Director-General will normally only agree Limited Authorisationprocedures the limits of which are determined by Approved Organisations usingthe following criteria:(a)(b)(c)It must be assumed that the limited authorisation holder is onlyproficient in the tasks for which they are authorised.The Organisation shall carefully consider the scope of the authorisationto ensure that the holder is fully aware of the limits of the authorisation.For example, the Limited Authorisation holder should be aware thatwhat appears to be a straightforward condition indication may be asymptom of a defect with totally different diagnostic implications, anexample of this would be a heat pack which may be worn to limit as aresult of progressive normal wear or by premature excessive wearcaused by a braking system defect. The Limited Authorisation holdershould therefore be aware of the implications of repetitive defects andthat suitable steps should be taken to ensure that the defect does not fallinto this category and as a result lie outside the limits of authorisation.Use of test equipment should be limited by a determination of whetheror not the test sequence is in itself self-explanatory. The test sequenceshould be straightforward and produce a clear GO or NO GO result and31 January 2002 AN-14 A5 P.2