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code giving an appreciably lower level of performance than
that illustrated by these Acceptable Means of Compliance was
considered to be a violation of the Standards in Chapter 5 of
this Annex.
Present policy on international airworthiness. There had
been some concern about the slow progress that had been
made over the years with respect to developing supplementary
airworthiness specifications in the form of Acceptable Means
of Compliance. It was noted that the majority of the Acceptable
Means of Compliance in Annexes 6 and 8 had been
developed in 1957 and were therefore applicable to only those
aeroplane types operating at that time. No effort had been
made to update the specifications in these Acceptable Means
of Compliance nor had there been any recommendations from
the Airworthiness Committee for upgrading of any of the
Provisional Acceptable Means of Compliance, which had been
developed as potential material for full-fledged Acceptable
Means of Compliance. The Air Navigation Commission therefore
requested the Airworthiness Committee to review the
progress made by it since its inception with a view to determining
whether or not desired results had been achieved and
to recommend any changes to improve the development of
detailed airworthiness specifications.
The Airworthiness Committee at its Ninth Meeting
(Montreal, November/December 1970) made a detailed study
of the problems and recommended that the concept of
developing airworthiness specifications in the form of Acceptable
Means of Compliance and Provisional Acceptable Means
of Compliance be abandoned and a provision be made for an
airworthiness technical manual to be prepared and published
by ICAO to include guidance material intended to facilitate the
development and uniformity of national airworthiness codes
by Contracting States.
The Air Navigation Commission reviewed the recommendations
of the Airworthiness Committee in the light of the
history of the development of the airworthiness policy
approved by the Council in 1956. It came to the conclusion
that the basic objectives and principles on which the ICAO
airworthiness policy had been based were sound and did not
require any significant change. It was also concluded that the
main reason for the slow progress in the development of
airworthiness specifications in the form of Acceptable Means
of Compliance and Provisional Acceptable Means of
Compliance was the degree of mandatory status to the former
implied by the following statement included in the Forewords
of Annexes 6 and 8:
"To adopt a code giving an appreciably lower level of
airworthiness than that given in an Acceptable Means of
Compliance would be a violation of the Standard
supplemented by that Acceptable Means of Compliance."
Several approaches were examined by the Air Navigation
Commission to eliminate this difficulty. Finally, it came to the
conclusion that the idea of developing airworthiness
specifications in the form of Acceptable Means of Compliance
and Provisional Acceptable Means of Compliance should be
abandoned and ICAO should declare that the States'
obligations, for the purpose of Article 33 of the Convention,
shall be met by their compliance with the broad Standards in
Annex 8 supplemented, as necessary, by airworthiness
technical guidance material, devoid of all mandatory implications
or obligations. Also the requirement that each Contracting
State should either establish its own comprehensive
and detailed code of airworthiness or select a comprehensive
and detailed code established by another Contracting State
should be retained.
The Council on 15 March 1972 approved the above
approach to form the basis for the present policy of ICAO in
the field of airworthiness.
It also approved the issuance of the airworthiness guidance
material under the title of Airworthiness Technical Manual. It
was understood that the guidance material would have no
formal status and its main purpose would be to provide
guidance to Contracting States in developing the detailed
national airworthiness code mentioned in 2.2 of Part I1 of
Annex 8.
With respect to Annex 6, Part I, it was agreed that the
guidance material in the Acceptable Means of Compliance for
Aeroplane Performance Operating Limitations should be
Annex 6 - Operation of Aircraft
edited suitably and retained in the Annex but in the form of an
Attachment (green pages).
Performance Standards of Annex 8. Chapter 2, Part IIIA,
and Sub-part B, Part IIIB, of Annex 8 contain aeroplane performance
Standards that are complementary to the Standards
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ICAO 附件6 Operation of Aircraft(9)
