31 January 2007 AN-77 P.1 CIVIL AVIATION DEPARTMENT HONG ...

CIVIL AVIATION DEPARTMENTHONG KONG, CHINAAirworthiness NoticeNo. 77Issue 431 January 2007COUNTER/POINTER ALTIMETERS1 The United Kingdom Altimeter Committee in 1965 concluded the best altitudepresentation was provided by the counter/pointer type instrument. The Director-General is satisfied that subsequent experience has supported this conclusion.2 In the case of turbo-jet-engined aircraft, in which hazardous misreading of altimetersis more likely to occur, it is desirable to eliminate reliance on the less satisfactorytypes of presentation. Therefore, subject to the proviso of paragraph 3, all turbo-jetenginedaircraft of over 5700 kg MTWA shall, have as a minimum two approvedcounter pointer type instruments.NOTE: Temporary Guidance Leaflet No. 28 of JAA Administrative & Guidance Material, SectionFour identifies the unacceptable basic layouts.3 Presentations developed for Electronic Flight Instrument System (EFIS) altimeters(e.g. tapes, bars, etc) are acceptable equivalent to counter drum-pointer displays,provided that they do not replicate the unacceptable layouts described in paragraph 2.4 The Director-General may, under certain circumstances, accept as a minimum one ofthe following:(a)(b)One approved counter/pointer type instrument visible to both crew members,in addition to their normally positioned altimeters, orone approved counter/pointer type instrument in the Captain's normalaltimeter position, in addition to the existing altimeters at other crew stations.5 CancellationThis Notice cancels Airworthiness Notice No.77 Issue 3, dated 31 January 2002,which should be destroyed.Norman LODirector-General of Civil AviationAN-77 P.131 January 2007

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