CAP 670 Air Traffic Services Safety Requirements 2(38)

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Clearance Below Path (at ±8° azimuth)  During the prescribed level flight, a minimum deflection current of 190 μA (0.22 ddm) must beachieved at 0.45θ measured close to the edge of DOC. (1234)  Commissioning 1 & 2Annual 1 or 2Routine – Alternate from the annual 
Clearance Above Path  Smooth increase in fly-down from the glidepath angle to an angle where the fly-down is 190 μA (0.22 ddm). Between this angle and 1.75θ, the fly-down must not fall below 150 μA (0.175 ddm). (1934)  Commissioning 1 & 2Annual 1 & 2Routine 1 & 2 

Parameter  Commissioning  Annual/ Routine  Transmitter to be checked 
Coverage  Adequate coverage must exist to the edge of the DOC and down to 0.45θ or a lower angle down to0.3θ, as required to safeguard the promulgated glidepath intercept procedure. (2169)Adequate coverage is defined as a receiver input exceeding the equivalent of a 40 μV source of EMF and a total impedance of 50 ohms resistive, together with sufficient current to remove the flag alarm.  Commissioning 1 & 2Annual 1 & 2Routine 1 & 2 
Course Structure  Course structure shall have a probability of 95% or better of not exceeding the limits given below,when assessed over a 40 second interval (1238).Cat I30 μA (0.035 ddm) Edge of DOC to point C. (2170)Cat II30 μA (0.035 ddm) Edge of DOC to point A, then decreasing at a linear rate to 20 μA (0.023 ddm) atpoint B. 20 μA from point B to the ILS reference datum. (2171)Cat III30 μA (0.035 ddm) Edge of DOC to point A, then decreasing at a linear rate to 20 μA (0.023 ddm) atpoint B. 20 μA from point B to the ILS reference datum. (2172)NOTE: Guidance on course structure assessment may be found in Attachment C to ICAO Annex 10Volume 1.  Commissioning 1 or 2Annual 1 or 2Routine 1 or 2 
Biased Structure  The structure of the edges used to calculate the displacement sensitivity should have goodcorrelation with the course structure. (1935)  Commissioning 1 or 2Annual 1 or 2Routine None 

Parameter  Commissioning / Annual / Routine  Transmitter 
Coverage  The following distances shall be measured whilst on the ILS glidepath and localiser course line:Inner Marker 150 m ± 50 m (2175)Middle Marker 300 m ±100 m (2176)Outer Marker 600 m ±200 m (2177)  Commissioning 1 & 2Annual 1 & 2Routine 1 & 2 
Field strength  No less than 1.5 millivolts per metre at the limits of coverage. Rising to at least 3 millivolts per metre (2178)  Commissioning 1 & 2Annual 1 & 2Routine 1 & 2 

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ILS 03 EU OPS 1 General Requirements

1  Introduction
1.1  Subpart E of the European Union Commission Regulation (EC) No. 859/2008 (Commonly known as EU-OPS 1) introduces revised requirements for All Weather Operations.
1.2  A key component in Subpart E is the introduction of the concept of "Lower Than Standard Category 1" and "Other Than Standard Category 2" approach operations. In these operations, approved aircraft operators will be able to take advantage of the aircraft's autoland capability or new Head Up Display Landing System (HUDLS) technology when the Runway Visual Range (RVR) is below the conventional limit for Category 1 and with reduced Aeronautical Ground Lighting requirements for Category 2.
1.3  These operations require that the Instrument Landing System meets more stringent requirements based on the ICAO ILS Classification scheme depending upon the minimum RVR value that is intended to be used.
NOTE:  The ICAO ILS Classification scheme is defined in ICAO Annex 10 Volume 1 Radio Navigation Aids Attachment C 2.14.
1.4  Subpart E also allows suitably approved aircraft operators to benefit from the use of Enhanced Vision Systems (EVS). Operators will be able to conduct Category 1 Precision Approaches and Approaches with Vertical Guidance (APV) in reduced RVR conditions.
　
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