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

when installed, shall be monitored.3.1.2 Annual inspections shall be carried out as follows:(a)(b)(c)(d)(e)(f)(g)the read-out of the recorded data from the FDR and CVR shallensure that the recorder operates correctly for the nominalduration of the recording;the analysis of the FDR shall evaluate the quality of therecorded data to determine if the bit error rate is withinacceptable limits and to determine the nature and distribution ofthe errors;a complete flight from the FDR shall be examined inengineering units to evaluate the validity of all recordedparameters. Particular attention shall be given to parametersfrom sensors dedicated to the FDR. Parameters taken fromthe aircraft's electrical bus system need not be checked if theirserviceability can be detected by other aircraft systems;the read-out facility shall have the necessary software toaccurately convert the recorded values to engineering units andto determine the status of discrete signals;an annual examination of the recorded signal on the CVR shallbe carried out by re-play of the CVR recording. Whileinstalled in the aircraft, the CVR shall record test signals fromeach aircraft source and from relevant external sources toensure that all required signals meet intelligibility standards;andwhere practicable, during the annual examination, a sample ofin-flight recordings of the CVR shall be examined for evidencethat the intelligibility of the signal is acceptable.an annual examination of the recorded images on the AIR shallbe carried out by replay of the Airborne Image Recorder (AIR)recording. While installed in the aircraft, the AIR shall recordtest images from each aircraft source and from relevant externalsources to ensure that all required images meet recordingquality standards.3.1.3 Flight recorder systems shall be considered unserviceable if there is asignificant period of poor quality data, unintelligible signals, or if oneor more of the mandatory parameters is not recorded correctly.15 November 2010 AN-36F P.2