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2  Scope
2.1  This document defines the ATS requirements for Lower Than Standard Category 1, Other Than Standard Category 2 and Enhanced Vision Systems approach operations, above and beyond those already published for the normal facility category.
3  Safety Objective
The equipment shall provide a complete, identified, accurate and uncorrupted source of guidance information to aircraft, with levels of integrity and continuity of service which are consistent with the category of service provided.
4  Lower Than Standard Category 1 Operations
4.1  The Localiser offset shall be less than or equal to 3 degrees (2357).
4.2  Operations to an RVR between 549 m and 450 m
4.2.1  The Localiser shall meet the Localiser Course Structure requirement for Category 2 as detailed in ILS 02 Table 1 (2358).
4.2.2  The Localiser Sensitive Area shall be defined to protect the CAT II course structure requirements of ILS 02 Table 1 (2359).
4.3  Operations to an RVR between 449 m and 400 m
4.3.1  The Localiser and Glidepath shall meet the Category 2 requirements in ILS 01 (2360).
4.3.2  The Localiser and Glidepath shall meet the Category 2 requirements in ILS 02 (2361).
4.3.3  The Localiser shall comply with ILS 10 paragraph 13.1.4 (2362).
4.3.4  The Glidepath Sensitive Areas shall be defined to protect the CAT II course structure requirements in ILS 02 Table 2 (2363).
4.3.5  The Localiser Sensitive Area shall be defined to protected the CAT III course structure requirements of ILS 02 Table 1 and ILS 10 paragraph 13.1.4 (2364).
5  Other Than Standard Category 2 Operations
5.1  The Localiser offset shall be less than or equal to 3 degrees (2365).
5.2  Operations to an RVR between 450 m and 350 m
5.2.1  The Localiser shall comply with ILS 10 paragraph 13.1.4 (2366).
5.2.2  The Localiser Sensitive Area shall be set to protect the CAT III course structure requirements of ILS 02 Table 1 and ILS 10 paragraph 13.1.4 (2367).
ILS 06  Requirements for ILS and ILS/DME Identity Keying
Part 1 Preliminary Material
1 Introduction
ICAO Annex 10 requires that ILS and DME systems shall radiate an identity code when they are operationally available.
2 Scope
This document defines the identity keying requirements for all categories of ILS including those systems with an associated DME.
Part 2 Requirements
3  Safety Objective
An operationally available ILS or DME shall radiate an identity code permitting it and its operational status to be positively identified (1327).
4  Keying Sequence
4.1  Safety Objective
An associated ILS and DME shall radiate identity codes which positively identify their association (1328).
4.2  When a DME is associated with an ILS, the identity keying of both systems shall be synchronised (1329). ICAO Annex 10 refers to this as 'associated' code.
4.3  A complete keying sequence shall occupy approximately 40 seconds (1330).
NOTE:  In the following descriptions the 40 second interval is represented by /4 and the number of times the Morse code is repeated in that interval is shown by the preceding figure. i.e. 1/4 means that the Morse code identity occurs once in each 40 second interval.
5  Master Equipment
Unless the DME is also associated with an MLS, either the DME or the ILS may be used as the master identity keyer.
6  System Operation
6.1  If at any time the master equipment fails, the slave equipment shall revert to totally independent keying (1331).
6.2  If the master keyer is subsequently returned to service, the slave equipment shall automatically return to normal slave operation, with no requirement for manual resetting at the slave equipment (1332).
6.3  When a localiser is acting as slave to a DME it shall key 3/4. The DME keying shall be synchronised to occur where there is an interval in the localiser keying. If the DME fails, the localiser shall revert to 4/4 keying with no gap where the DME identity would have been (1333).
　
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