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4.2  Radiated Frequency The equipment shall transmit only on the frequency assigned by the CAA and as
appears in the schedule to the radio licence issued under the Wireless Telegraphy Act (1807).
4.3  Beacon Accuracy ICAO Annex 10, Volume 1, section 3.3 gives a measurement distance of four
wavelengths from the centre of a CVOR beacon, the equivalent measurement position for a DVOR shall be 300 metres from the centre of the DVOR (1808).
4.4  Effective Coverage of the Beacon
The DOC will be determined as part of a standard flight check during the commissioning of the VOR (1809).
4.5  Identification
The Identification shall be suppressed when the VOR is not available for operational purposes, e.g. under maintenance (1810).
NOTE:  The normal identity code may be radiated for short periods during maintenance or flight inspection as necessary.
4.6  Speech Modulation
With the exception of ATIS, no other voice communication channel shall be transmitted via the VOR system (1811).
4.7  Standby Power
Standby power supplies shall be provided commensurate with the service being supported (1812).
4.8  Status Information
4.8.1  Flight Information Service Officers and/or Air Traffic Controllers directly responsible for approach, landing and take-off at the aerodrome(s) with which they are concerned shall be provided with information on the operational status of radio navigation services, on a timely basis, consistent with the use of the service(s) involved (2312).
4.8.2  Where status information is reliant upon a visual status indicator, then an audible alarm should be provided which indicates that the visual indicator has changed state (2313).
4.9 Flight Inspection
Flight inspection shall be carried out in accordance with the requirements in CAP 670 NAV 03 (1814).
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NAV 05  Engineering Requirements for Distance Measuring Equipment (DME) Transponders
Part 1 Preliminary Material
1 Introduction
Under the terms of Article 205 of the Air Navigation Order all Distance Measuring Equipment (DME) Transponder installations intended for use in the provision of an Air Traffic Service in the United Kingdom require approval by the CAA.
2 Scope
This document sets out the Engineering Requirements for all Distance Measuring Equipment (DME) Transponders intended for use in the provision of an Air Traffic Service.
Part 2 Requirements
3  Safety Objective
The DME Transponder equipment shall not radiate a signal which falls outside standard operating tolerances or provide false information over its Designated Operational Coverage area (DOC).
4  System Requirements
4.1  SARPs Compliance
In addition to the requirements below, DME transponder systems shall comply with the Standards and Recommended practices (SARPs) in ICAO annex 10 Volume 1 Chapter 2 General Provisions for Radio Navigation Aids (1816) and Chapter 3 Section
3.5. Specification for UHF Distance Measuring Equipment (DME) (1817).
NOTE:  Where the UK has differences filed to SARPs these will be published in Supplements to the annexes and in the UK AIP.
4.2  Radiated Frequency
The equipment shall operate only on the frequencies assigned by the CAA and as appears in the schedule to the radio licence issued under the Wireless Telegraphy Act (1818).
4.3  Identification
The Identification signal shall be suppressed when the DME is not available for operational service (1819).
NOTE:  The normal identity code may be radiated for short periods during maintenance or flight inspection as necessary.
4.4  Flight Inspection Requirements
DME shall be flight inspected in accordance with the requirements for DME Flight Inspections contained in NAV 06, Distance Measuring Equipment (DME) Flight Inspection Types and Requirements (1820).
　
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