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routes in the area.
6.3 Notification, by NOTAM, of anticipated or actual
disruption of air traffic services and/or related supporting
Annex 11 — Air Traffic Services Attachment D
27/03 ATT D-4
42
services should be dispatched to users of air navigation
services as early as practicable. The NOTAM should include
the associated contingency arrangements. In the case of
foreseeable disruption, the advance notice should in any case
not be less than 48 hours.
6.4 Notification by NOTAM of discontinuance of
contingency measures and reactivation of the services set forth
in the regional air navigation plan should be dispatched as
early as practicable to ensure an orderly transfer from
contingency conditions to normal conditions.
23/11/06
No. 44
ANNEX 11 ATT E-1 23/11/06
No. 44
ATTACHMENT E. ACCEPTABLE LEVEL OF SAFETY
1. Introduction
1.1 The introduction of the concept of acceptable level of
safety responds to the need to complement the prevailing
approach to the management of safety based upon regulatory
compliance, with a performance based approach that aims for
continuous improvement to the overall level of safety.
1.2 Acceptable level of safety expresses the safety goals
of an oversight authority, an operator, or a services provider.
From the perspective of the relationship between oversight
authorities and operators/services providers, it provides the
minimum safety objective(s) acceptable to the oversight
authority to be achieved by the operators/services providers
while conducting their core business functions. It is a reference
against which the oversight authority can measure safety
performance.
1.3 Establishing acceptable level(s) of safety for the
safety programme does not replace legal, regulatory, or other
established requirements, nor does it relieve States from their
obligations regarding the Convention on International Civil
Aviation and its related provisions.
1.4 Establishing acceptable level(s) of safety for the
safety management system does not relieve operators/services
providers from their obligations under relevant national regulations
and the Convention on International Civil Aviation.
2. Scope
2.1 Within each State, different acceptable levels of
safety may be established between the oversight authority and
individual operators/services providers.
2.2 Each agreed established level of safety should be
commensurate with the complexity of individual operator/
service providers operational contexts, and the level to which
safety deficiencies can be tolerated and realistically addressed.
3. Implementation
3.1 The concept of acceptable level of safety is
expressed in terms of safety performance indicators and safety
performance targets, and implemented through safety requirements.
3.2 The relationship between acceptable level of safety,
safety performance indicators, safety performance targets and
safety requirements is as follows: acceptable level of safety is
the overarching concept; safety performance indicators are the
measures or metrics to determine if the acceptable level of
safety has been achieved, safety performance targets are the
quantified objectives pertinent to the acceptable level of safety,
and safety requirements are the tools or means required to
achieve the safety performance targets.
3.3 The safety performance indicators of an acceptable
level of safety should be uncomplicated and linked to major
components of a State safety programme, or an operator/services
provider safety management system (SMS). They are generally
expressed in numerical terms.
3.4 The safety performance targets of an acceptable level
of safety should be determined after weighing what is desirable
and what is realistic for individual operator/services providers.
Safety performance targets should be measurable,
acceptable to the parties involved, and consistent with the
acceptable level of safety.
3.5 The safety requirements to achieve the safety performance
targets of an acceptable level of safety should be
expressed in terms of operational procedures, technology and
systems, programmes, contingency arrangements and so forth,
to which measures of reliability, availability and/or accuracy
may be added.
3.6 An acceptable level of safety should be expressed by
several safety performance indicators and translated into several
safety performance targets, rather than by single ones.
— END —

Annex 11
Thirteenth Edition
Corrigendum
(English only)
31110103
INTERNATIONAL STANDARDS
　
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