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attention should be paid to ensuring that the required level of
safety will be maintained under conditions which may be
encountered during such operations, e.g. flight for extended
periods following failure of an engine and/or essential
systems. Information or procedures specifically related to
extended range operations should be incorporated into the
aeroplane flight manual, maintenance manual or other
appropriate document.
Note.- Criteria for aeroplane systems performance and
reliability for extended range operations are contained in the
Airworthiness Manual (Doc 9760).
4. Propulsion system maturity
and reliability
4.1 Basic elements to be considered for the authorization
of extended range operations are the maturity and reliability of
the propulsion system. These should be such that the risk of
complete loss of power from independent causes is extremely
remote.
4.2 The only way to assess the maturity of the propulsion
system and its reliability in service is to exercise engineering
judgement, taking account of the worldwide experience with
the power-unit.
4.3 For a propulsion system whose reliability has already
been assessed, each national authority must evaluate the ability
of the operator to maintain that level of reliability, taking into
account the operator's record of reliability vis-a-vis powerunits
of closely related types.
5. Airworthiness modifications and
maintenance programme reqoirements
Each operator's maintenance programme should ensure that:
a) the titles and numbers of all airworthiness modifications,
additions and changes which were made to
qualify aeroplane systems for extended range operations
are provided to the State of Registry and, where
applicable, to the State of the Operator;
b) any changes to maintenance and training procedures,
practices or limitations established in the qualification
for extended range operations are submitted to the State
of the Operator and, where applicable, to the State of
Registry before such changes are adopted;
C) a reliability reporting programme is developed and
implemented prior to approval and continued after
approval;
d) prompt implementation of required modifications and
inspections which could affect propulsion system
reliability is undertaken;
e) procedures are established which prevent an aeroplane
from being dispatched for an extended range operation
after power-unit shutdown or primary system failure on
a previous flight until the cause of such failure has been
positively identified and the necessary corrective action
is completed. Confirmation that such corrective action
has been effective may, in some cases, require the
successful completion of a subsequent flight prior to
dispatch on an extended range operation; and
f) a procedure is established to ensure that the airborne
equipment will continue to be maintained at the level of
performance and reliability required for extended range
operations.
6, Flight dispatch requirements
In applying the general flight dispatch requirements of
Chapter 4 particular attention should be paid to the conditions
which might prevail during extended range operations, e.g.
extended flight with one power-unit inoperative, major
systems degradation, reduced flight altitude, etc. In addition to
the requirement of Chapter 4, 4.7.3, at least the following
aspects should be considered:
a) pre-flight system serviceability;
b) communication and navigation facilities and capabilities;
c) fuel requirements; and
d) availability of relevant performance information,
7. Operational principles
An aeroplane which is engaged in an extended range operation
should normally, in the event of:
a) shutdown of a power-unit, fly to and land at the nearest
(in terms of the least flying time) aerodrome suitable for
landing;
b) a single or multiple primary aeroplane system failure,
fly to and land at the nearest suitable aerodrome unless
1/11/01 ATT E-2
Attachment E Annex 6 - Operation of Aircm!
it has been demonstrated, in view of the flight
consequences of the failure and the probability and
consequences of subsequent failures, that no substantial
degradation of safety results from continuation of the
planned flight; and
C) changes impacting the status of items on the minimum
equipment list, the communications and navigation
facilities, fuel and oil supply, en-route alternate
aerodromes or aeroplane performance, make appropriate
adjustments to the flight plan.
8. Operational authorization
In authorizing the operation of an aeroplane with two powerunits
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ICAO 附件6 Operation of Aircraft(75)
