CAP 670 Air Traffic Services Safety Requirements 2(53)

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PowerDensity  In accordance with ICAO Annex 10 Volume 1 paragraph 3.11.4.10.1 for high rate approachazimuth guidance and approach elevation guidance  Commissioning 20 NM ±40 degrees part orbit within coverage at MSA; andPart orbit at not less than 5NM from ARD at MSARoutine Part orbit at not less than 5NM from ARD at MSA  CommissioningPlot of ±40 degrees at 20NM; andPlot of ±40 degrees at 5 NMRoutinePlot of ±40 degrees at 5 NM  Commissioning20 NM one TXonly5 NM both TXRoutineBoth 
PowerDensityat ARD  +15 dB above the value in ICAO Annex 10 Volume1 paragraph 3.11.4.10.1  Ground spot checkAntenna extended to ARD  Direct read off groundequipment  CommissioningBothRoutineBoth 

Parameter  Tolerance  Profile  Measurement to be made  Transmitter tobe checked 
PowerDensity along runway  Greater than 5 dB above the value in ICAO Annex 10 Volume 1 paragraph 3.11.4.10.1 for one degreeor 9 dB for 2 degree or larger beam width antennas at 2.5 m (8 ft) above the runway surface, at theMLS datum point, or at the farthest point of therunway centre line which is in line of sight of the azimuth antenna  Ground spot check  Direct read off groundequipment  CommissioningBothRoutineBoth 
Multipath relativepowerdensity Within theMLS azimuth coverage at60 m (200 ft)or more abovethreshold  The duration of a reflected scanning beam signal whose power density is higher than 4 dB belowthe azimuth guidance scanning beam signal power density shall be shorter than one second  Level Slice on centreline from 20NM at 0.3 theta to intersect a Fly down from 7 NM on azimuth and elevation to ARD  Plot or analysis  CommissioningOne TXBiennial OneTX 
Multipath relativepowerdensityWithin theMLS azimuth proportional guidancesector, below 60 m (200 ft)above threshold  The power density of any reflected approachazimuth guidance scanning beam signal shall be less than 10 dB above the power density of the approach azimuth guidance scanning beam signal  Ground check on centreline between ARD and along runway  From plot  CommissioningOne TXBiennial OneTX 

Parameter  Tolerance  Profile  Measurement to be made  Transmitter tobe checked 
Monitor Verification  Ground check  Spot check  CommissioningBothRoutineBoth 
Identification  Ground check  Spot check  CommissioningBothRoutineBoth 

Parameter  Tolerance  Profile  Measurement to be made  Transmitter tobe checked 
Accuracy at ApproachReference Datum  Mean Glidepath Error (MGE) ± 0.3mNote: The ICAO Standard in Annex 10 Volume 1 paragraph 3.11.5.3.5.1 is for ground equipmentcontribution. Checks in the far field would include the effects of multipath.  Due to the similarity withILS it is assumed that this requirement includes multipath effectsMGE standard needs to be clarified by ICAO  Static antenna at the ARD  Direct reading  CommissioningBothRoutineBoth 

Parameter  Tolerance  Profile  Measurement to be made  Transmitter tobe checked 
AngleAccuracyEdge ofcoverage to ARD  PFE and PFN PFE ± 0.6m at ARDPFN ± 0.4m at ARDThe PFE limit and PFN limit, expressed in angular terms at 37 km (20 NM) from the runway threshold on the minimum glide path, shall degrade linearly to 0.2 degreesCMNCMN ± 0.3m at ARDThe CMN limit, expressed in angular terms at 37 km (20 NM) from the runway threshold on the minimum glide path, shall degrade linearly to 0.1 degreesFly up deflection shall exist at all angles betweenlower limit of coverage and 2.2 degrees, thereafterAnnex 10 Volume 1 Standard applies between 2.2 degrees and theta  This is a two-part testLevel Slice on centreline from 20NM at 0.3 theta to 1.75 theta ofthe elevationFly down from 7 NM on azimuth and elevation to ARD  Plot from 0.3 theta to 1.75theta, and;Plot from 7NM to ARD  CommissioningBothRoutineBoth 
　
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