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Glide Path Interference - YSSYRon Hard

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Glide Path Interference - YSSY

• Overview of 3 occurrences• YSSY layout• ILS PRM• ILS Protection• ILS Modelling• Traffic Analysis• Controls

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Occurrences

• 12 February, 16 March & 23 March• ILS PRM in progress• On approach to RWY16R• Cat E or F aircraft taxying across A1 for 16R departure• Between 9 and 12 NM from threshold• Descended below the published glide path• MSAW alert triggered

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Glide Path Interference

• Known interference with glide path at A1

• Usually observable as fluctuations on PFD

• In these occurrences, aircraft have captured an erroneous signal of sufficient duration

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ILS PRM

• Aircraft cleared to 3000’ 15-18NM from threshold• Also cleared the approach

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ILS Protection

• ICAO does not specify ILS protection areas but provides guidance• In Australia, we have ILS Critical and Sensitive Areas

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ILS ProtectionCountry Australia New Zealand USA Canada UKWeather Criteria ILS CSA protected

when cloud is below 600 ft or visibility is less than 2000 m

ILS CSA protected when cloud is below 1000 ft or visibility is less than 5000 m

ILS CSA protected when cloud is below 800 ft or visibility is less than 3200 m

ILS CSA protected when cloud is below 1000 ft and visibility is less than 3 miles

ILS CSA proetectedwhen cloud is below 300 ft and visibility is less than 1000 m

Critical and Sensitive Area (CSA) Protection

Aircraft within the ILS OM or 4 NM from touchdown. Depending on cloud base and visibility, the ILS sensitive area is protected when arriving aircraft are 2 NM from touchdown

Arriving aircraft are within 8 NM of touchdown

Arriving aircraft is within the ILS OM. Depending on cloud and visibility, the critical area is protected when arriving aircraft are inside the Middle Marker

Arriving aircraft is inside the final approach fix on an ILS approach

Withdrawal of vehicles and personnel involved in non‐essential activities on the manoeuvring area also initiated

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ILS Modelling

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Traffic Analysis

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Controls

• Monitoring (ATC and Flight Crew)• MSAW• EGPWS• Awareness (AIC, new chart)

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Conclusion

• Significant increase in A380 traffic• Increase in IFR arrivals to RWY16R• ILS not protected outside 4NM• A380 can cause interference which causes the capture of false guidance• Interference can last between 14 – 18 seconds as A380 transits A1• Maximum exposure is 00:01:47 per hour