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6.2  ATS providers intending to facilitate RNAV(GNSS) IAPs must provide the usual notice of the intended change to the Air Traffic Standards Division (ATSD) in accordance with CAP 670 Part A Regulatory Framework, paragraph 6.9 Change Notification Requirements.
6.3  RNAV(GNSS) IAPs must be supported by safety assurance documentation arguing the adequate safety of the proposed IAP in accordance with the proposer's Safety Management System and should be submitted to the appropriate CAA ATSD Regional Office in parallel with the application to DAP referred to in paragraph 4.1 above.
6.4  An essential aspect to be addressed in the safety assurance documentation is that of the suitability of the performance of the GPS Signal in Space (SiS) to support the intended operation. It is recognised that a performance assessment of the GPS SiS is not a trivial task and is unlikely to be achieved by individual service providers in the short term. With this in mind, the CAA will make available data from monitoring carried out over recent years to allow assurance to be gained that the performance of the SiS is suitable to meet ICAO requirements for the support of Instrument Approach procedures. This or other suitable third party data may be used in the development of safety assurance documentation to argue the acceptability of the GPS to support the approach procedure.
6.5  Further guidance material is available in the Global Navigation Satellite System (GNSS) Supported Services area of the ATS requirements Overview pages on the CAA website: www.caa.co.uk/ATSRequirementsOverview.
VDF 01  Requirements for Flight and Ground Inspection of VHF Direction Finding (VDF) Systems
Part 1 Preliminary Material
1 Introduction
Approval under Article 205 of the ANO may be granted for a VDF used in support of ATC operation providing Navigation assistance for aircraft under their control.
2 Scope
This document details the minimum requirements for the flight inspection of VDF systems. Additional checks may be required due to poor or difficult siting conditions.
Part 2 Requirements
3  Safety Objective
The VDF equipment shall provide indications of known accuracy to ATC of the magnetic bearing to or from the VDF site of aircraft transmitting on associated aerodrome communication frequencies.
4  Functional Requirements
4.1  Introduction
4.2  To achieve the safety objective the accuracy and useful service area of the VDF installation shall be demonstrated by Flight Inspection.
4.3  VDF Flight Inspection shall be undertaken on Commissioning of new equipment, replacement of aerial system, relocation of equipment or other major adjustment or modification which may cause the accuracy of the equipment to be compromised, or at any other time as required by an ATSD Engineering Inspector.
NOTE:  The method of flight inspection is not specified in this publication, only the parameters to be measured. Examples of methods of flight inspection include:
a) A suitably equipped flight inspection aircraft, using an automatic or semi-automatic positioning or tracking system.
b) Positioning an aircraft over previously surveyed ground checkpoints.
c) Use of a theodolite, sympathetically positioned at the VDF antenna in order to minimise reception induced errors, tracking the target aircraft.
d) Use of Radar positioning of the aircraft in combination with ground surveyed checkpoints.
e) Use of GPS equipped aircraft, in combination with ground surveyed checkpoints.
4.4  Use can be made of any suitable method, providing that the positioning accuracy of the aircraft is better than the required accuracy of the VDF by a factor of 5, i.e. Class A / 5 = ± 0.4° aircraft positioning accuracy.
5  Required Procedures
5.1  The following activities shall be carried out during the commissioning of the VDF.
5.2  Ground checks
　
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本文鏈接地址：CAP 670 Air Traffic Services Safety Requirements 2(73)