4.1.5.2 Terminal Area
4.1.5.2.1
The system use accuracy required for the execution of SIDs and STARs, as
well as RNAV feeder routes, providing the transition to the en-route structure,
will be specified as part of the definition of the departure or arrival route.
Either RNP 5 or RNP 1 may be required and parts of the route may have
different requirements. Procedures demanding a specific RNP will only be
flown by equipment approved for that RNP and having the functions required
by paragraph 5.3. It should be noted that for a transition period, in addition to
RNP RNAV procedures, Terminal Area procedures, including SIDs and
STARs, may be designed for execution using specific navigation aids (eg
VOR/DME or DME/DME GPS/GNSS). In such situations the RNP value may
not be stated - note 3 applies.
NOTES
1. Some TMA RNAV routes (e.g. Arrival routes) may demand
performance better than RNP 1. This will be required only where the
navigation infrastructure can meet the required precision and
continuity of service levels.
2. To operate on TMA routes, the RNAV system shall have been
approved as meeting the RNP using the available navigation
infrastructure.
3. Where TMA routes have been designed and promulgated as requiring
the application of one or more defined “Reference” navigation aids,
these aids shall be used for position fixing unless it can be
demonstrated that the proposed alternative means of position fixing
meets or exceeds the required navigation accuracy, continuity and
integrity.
4. Where a fixed radius turn is required for terminal operation the turn
radius will be defined as part of the procedure in accordance with
Figure 4.
003-93 Area Navigation Equipment
Operational Requirements and
Functional Requirements
Page 18 Released Issue Edition 2.2
4.1.5.2.2
The achievable RNP type depends upon both the available navigation aids
and the on-board equipment capability. In all cases, operators have the
responsibility to ensure that their aircraft have the capability to navigate with
the required level of accuracy when operating within the notified RNAV
environment. In determining this capability, due account shall be taken of the
navigation aids available in the designated RNAV environment at the time of
operation, the RNAV system capability and, where appropriate, the required
procedures for the flight crew.
4.2 Regulatory Approval
4.2.1
The Joint Aviation Authorities (JAA) or regulatory authority of the Operator's
State of Registry will define the appropriate standards for the airworthiness
approval of the installation and operation of area navigation equipment as
required in this document.
4.2.2
The RNAV functional requirements set out in Paragraph 5.3 are the minimum
functional requirements required of systems for operation on Area Navigation
routes and airspace. The document provides references to the detailed
capability requirements for application by manufacturers, operators and
National Authorities.