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(f) type of approach(es) to be expected  .  . 
(g) the runway(s) in use; status of arresting system constituting a potential hazard, if any  .  .  . 
(h) significant runway surface conditions and, if appropriate, braking action  .  .  . 
(i) holding / departure delay, if appropriate  .  .  . 
(j) transition level, if applicable  .  .  . 
(k) other essential operational information  .  .  . 
(l) surface wind direction and speed, including significant variations and, if surface wind sensors related specifically to the sections of the runway(s) in use are available and the information is required by operators, the indication of the runway and the section of the runway to which the information refers  .  .  . 
(m) visibility and, when applicable, RVR  *  .  .  . 
(n) present weather  *  .  .  . 
(o) cloud below 1 500 m (5 000 ft) or below the highest minimum sector altitude, whichever is greater; cumulonimbus; if the sky is obscured, vertical visibility when available  *  .  .  . 
(p) air temperature  .  .  . 
(q) dew point temperature  .  .  .  . 
(r) altimeter setting(s);  .  .  . 
(s) any available information on significant meteorological phenomena in the approach and climb-out areas including wind shear, and information on recent weather of operational significance  .  .  . 
(t) trend-type landing forecast, when available; and  .  .  . 
(u) specific ATIS instructions  .  .  . 

Footnote 
*  Those elements are replaced by the term “CAVOK”, whenever the conditions as specified in reference [4] Chapter 11 prevail. 
.  As determined on the basis of regional air navigation agreements. See reference [5]. 

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COM 06 UHF Radio Equipment and Systems
Part 1 Preliminary Material
1  Introduction
1.1  Under the terms of Article 205 (1) of the Air Navigation Order, any Air Traffic Service Equipment is required to have CAA approval before being established or used in the United Kingdom. An Aeronautical Radio Station is specifically included in the meaning of Air Traffic Service Equipment in Article 255 (1).
1.2  The definition of 'Aeronautical Radio Station' in Article 255 (1) is considered to include UHF radio equipment and systems at Base Stations and Land Mobile Stations of the Land Mobile Service, where they are used for the purpose of assisting aircraft.
1.3  The CAA regulatory responsibility for UHF radio equipment and systems is limited to those aspects associated with the ANO Approval. Ofcom are responsible for WT Act licensing and associated frequency assignments.
2  Scope
2.1  This document sets out the engineering requirements for UHF radio equipment and systems at Base Stations and Land Mobile Stations established or used within the United Kingdom in support of ATS aerodrome communications such as those used for ground movement (surface movement ) control service, fire service and air traffic engineering.
2.2  This document applies to the equipment categories of fixed (Base Station), vehicle, portable and hand held (Land Mobile Station) comprising equipment types of transmitter, receiver (Base Station) and transceiver (Land Mobile Station).
2.3  This document applies to UHF radio equipment and systems operating on frequency assignments in the UHF Land Mobile Service allocation 450 MHz to 470 MHz, using Frequency Modulation (FM) with 12.5 kHz channel spacing, for analogue voice communications.
3  Definitions and Abbreviations
3.1  Definitions
　
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