CAP 670 Air Traffic Services Safety Requirements 2(65)

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10.4  IRVR measurement on a runway operating to CAT I shall be made at one location representing the Touchdown TDZ area in accordance with the ICAO Recommended Practice (2252).
10.5  Recommendation: IRVR should be provided on a runway operating to CAT I in accordance with the ICAO Recommended Practice (2252) and if provided shall be made at one location representing the Touchdown TDZ area (1769).
NOTE:  Runway Visual Range (RVR) assessment using Human Observers may be permitted for runways operating to CAT I.
10.6  IRVR measurements on a runway operating to CAT II shall be made at two locations, representing the TDZ and midpoint (MID) (1770).
10.7  IRVR measurements on a runway operatingl to CAT II with a LDA greater than 2000 metres are recommended to be made at three locations, representing TDZ, MID and stop end (STP) (1771).
10.8  IRVR measurements on a runway operating to CAT III shall be made at three locations, representing TDZ, MID and STP (1772).
NOTE:  Particular attention should be paid to the design and location of the sensor heads to ensure an effective representation of the required coverage area.
10.9  The sensor housing shall not affect the accuracy of the atmospheric measurement (1682).
10.10  Summary of System Requirements Under Normal Operating Conditions:
IRVR Assessment Site (LDA – Landing Distance Available)  Category I Rwy less than 2000m LDA  Category II Rwy less than 2000m LDA  Category II Rwy 2000m or more LDA  Category III All Runways 
TDZ  Recommended  Required  Required  Required 
MID  Required  Required  Required 
STP  Recommended  Required 

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NAV 02  Engineering Requirements for MF Non-Directional Beacons
Part 1 Preliminary Material
1  Introduction 
Under the terms of Article 205 of the Air Navigation Order all Civil MF Non-Directional Beacon (NDB) installations, intended for use in the provision of an Air Traffic Service, require approval by the CAA. 
2  Scope 
2.1  This document sets out the Engineering requirements for MF Non-Directional Beacons (NDBs) intended for use in the provision of an Air Traffic Service. This document applies to all NDBs including those associated with published Instrument Approach Procedures, also known as Locators, promulgated as NDB(L). 

Part 2 Requirements
3  Safety Objective
The system shall radiate a signal which complies with the standard operating parameters and provides correct guidance to users within its rated coverage.
4  System Requirements
4.1  SARPs Compliance
In addition to the requirements below, NDB systems shall comply with the Standards and Recommended practices (SARPs) in ICAO annex 10 Volume 1, Chapter 2, General Provisions for Radio Navigation Aids (2038) and Chapter 3 Section 3.4, Specification for non-directional radio beacon (NDB) (2040).
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  Transmission Characteristics
4.2.1  Radiated Frequency
The equipment shall only transmit on the frequency assigned by the CAA and as appears in the schedule to the radio licence issued under the Wireless Telegraphy Act. (2041). The assigned frequency shall be maintained within ±0.01% (2042).
4.2.2  Power Output
The power output shall be adjusted to give a vertical field strength of 70 microvolts/ metre at the limit of the rated coverage (2043), and be maintained within tolerances of +2 dB (2044) and .3 dB (2045).
4.3  Modulation Characteristics
4.3.1  Identification
Modulation is by on/off keying of an amplitude modulating tone (2046). Each NDB shall be individually identified by a two or three letter international Morse code group as assigned (2047) and transmitted at a rate corresponding to approximately 7 words per minute (2048). The complete identification shall be transmitted at least 3 times in each 30 second period, equally spaced within that period (2049).
　
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