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to the cerhficating authori@,in compliance is not suflciently
high, i.e. less than 90 per cent. Consequently, the
manufacturer should be allowed to present additional
evdence of engine type compliance.
3.1 If an engine type fails a certification test, the
certificating authority shall permit the manufacturer, if he so
wishes, to conduct additional tests on the certification
engines. If the total results available still show that the engine
type fails the certification requirements, the manufacturer
shall be allowed to test as many additional engines as desired.
The resulting test results shall then be considered with all
previous data.
11/11/93 54 ANNEX 16 - VOLUME I1
Appendix 6 Annex 16 - Environmental Protection
3.2 If the result is still failure, the manufacturer shall
be allowed to select one or more engines for modification.
The results of the tests already made on the selected engine(?.)
while unmodified shall be inspected, and further testing shall
be done so that at least three tests are available. The mean of
these tests shall be determined for each engine and described
as the "unmodified mean".
3.3 The engine($ may then be modified, and at least
three tests shall be conducted on the modified engine(s), the
mean of which shall be described as the "modified mean" in
each case. This "modified mean" shall be compared to the
"unmodified mean" to give a proportional improvement
which shall then be applied to the previous certification test
result to determine if compliance has been achieved. It shall
be determined before testing of any modified engine is begun
that the modification(s) comply with the appropriate
airworthiness requirements.
3.4 This procedure shall be repeated until compliance
has been demonstrated or the engine type application is
withdrawn.
- END -
ICAO TECHNICAL PUBLICATIONS
The following summary gives the status, and also
describes in general terms the contents of the various
series of technical publications issued by the International
Civil Aviation Organization. It does not
include specialized publications that do not fall specifically
within one of rhe series, such as the Aeronautical
Chart Catalogue or the Meteorological Tables for
International Air Navigation.
International Standards and Recommended Practices
are adopted by the Council in accordance with
Articles 54, 37 and 90 of the Convention on International
Civil Aviation and are designated, for
convenience, as Annexes to the Convention. The
uniform application by Contracting States of the specifications
contained in the International Standards is
recognized as necessary for the safety or regularity of
international air navigation while the uniform application
of the specifications in the Recommended
Practices is regarded as desirable in the interest of
safety, regularity or efficiency of international air
navigation. Knowledge of any differences between the
national regulations or practices of a State and those
established by an International Standard is essential to
the safety or regularity of international air navigation.
In the event of non-compliance with an International
Standard, a State has, in fact, an obligation, under
Article 38 of the Convention, to notify the Council of
any differences. Knowledge of differences from
Recommended Practices may also be important for the
safety of air navigation and, although the Convention
does not impose any obligation with regard thereto, the
Council has invited Contracting States to notify such
differences in addition to those relating to International
Standards.
Procedures for Air Navigation Services (PANS) are
approved by the Council for world-wide application.
They contain, for the most part, operating procedures
regarded as not yet having attained a sufficient degree
of maturity for adoption as International Standards and
Recommended Practices, as well as material of a more
permanent character which is considered too detailed
for incorporation in an Annex, or is susceptible to
frequent amendment, for which the processes of the
Convention would be too cumbersome.
Regional Supplementary Procedures (SUPPS) have a
status similar tc, that of PANS in that they are approved
by the Council, but only for application in the respective
regions. They are prepared in consolidated form, since
certain of the procedures apply to overlapping regions
or are common to two or more regions.
The follo wing publicatipns are prepared by au thqrity
of the Secretary General in accordance with the
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