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Glide Slope Considerations to Provide Support for Aircraft Certification for Steep Angle Approaches International Flight Inspection Symposium Oklahoma.

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Presentation on theme: "Glide Slope Considerations to Provide Support for Aircraft Certification for Steep Angle Approaches International Flight Inspection Symposium Oklahoma."— Presentation transcript:

1 Glide Slope Considerations to Provide Support for Aircraft Certification for Steep Angle Approaches International Flight Inspection Symposium Oklahoma City, OK USA June 2008 David Quinet Aaron Wilson Avionics Engineering Center Ohio University

2 Glide Slope Considerations to Provide Support for Aircraft Certification for Steep Angle Approaches 2 of 27IFIS 2008, OKC ILS Signal Requirements Localizer Signal: –Aligned with runway centerline –Meet Category I course roughness tolerances Glide Slope Signal –5.5 to 8.65 degree path angle –Meet Category I path roughness down to an altitude of 344 feet

3 Glide Slope Considerations to Provide Support for Aircraft Certification for Steep Angle Approaches 3 of 27IFIS 2008, OKC Location Previous Facility: Blythe removed when cooling tower built under approach –Aircraft decoupling due to updraft TMB: 09L –Known site performance –National FAA ILS test facility Equipment and infrastructure [power, foundations, buildings] already exists Established working relations with ATC

4 Glide Slope Considerations to Provide Support for Aircraft Certification for Steep Angle Approaches 4 of 27IFIS 2008, OKC Summary of Aircraft Using Facility Aircraft TypeAvionicsPath Angles Flown (Degrees) Engineering Flight Dates E-175Honeywell5.55/08-6/1/08 Cessna MustangGarmin5.52/20-2/21/07 Gulfstream G-550Honeywell5.51/09/07 Gulfstream G -150Honeywell5.51/09/07 Cessna Encore+Rockwell Collins5.53/14/07 Cessna ExcelRockwell Collins5.53/31-4/01/08 Falcon 900Honeywell5.5, 6.65, 8.658/10-8/12/08;10/24- 26/07

5 Glide Slope Considerations to Provide Support for Aircraft Certification for Steep Angle Approaches 5 of 27IFIS 2008, OKC TMB Layout

6 Glide Slope Considerations to Provide Support for Aircraft Certification for Steep Angle Approaches 6 of 27IFIS 2008, OKC Summary of Ground Equipment Parameter Equipment LocalizerGlide Slope Frequency (MHz) Antenna TypeLog Periodic DipoleFAA 8971 Array Type8-Element Single-FrequencyNull Reference TransmitterMark 20Mark 1F CSB Power (W) Standby PowerBatteries (6 hours minimum)

7 Glide Slope Considerations to Provide Support for Aircraft Certification for Steep Angle Approaches 7 of 27IFIS 2008, OKC Glide Slope Mast All-Angles

8 Glide Slope Considerations to Provide Support for Aircraft Certification for Steep Angle Approaches 8 of 27IFIS 2008, OKC Flight Results Summary ParameterFlight Measurement ResultsFlight Inspection Tolerance Path Angle 5.5 Degrees 5/12/06 - 8/27/07 Width (degrees)1.36[1.41] Symmetry (%)47[47] Structure Angle (degrees)3.50[3.41]1.65 (minimum) Path Angle (degrees)5.49[5.46] Path Angle 6.65 Degrees 8/27/07 Width (degrees) Symmetry (%) Structure Angle (degrees) (minimum) Path Angle (degrees) Path Angle 8.65 Degrees 8/27/07 Width (degrees) Symmetry (%) Structure Angle (degrees) (minimum) Path Angle (degrees)

9 Glide Slope Considerations to Provide Support for Aircraft Certification for Steep Angle Approaches 9 of 27IFIS 2008, OKC Proportional Guidance Sector 5.5 Degrees

10 Glide Slope Considerations to Provide Support for Aircraft Certification for Steep Angle Approaches 10 of 27IFIS 2008, OKC Proportional Guidance Sector 6.65 Degrees

11 Glide Slope Considerations to Provide Support for Aircraft Certification for Steep Angle Approaches 11 of 27IFIS 2008, OKC Proportional Guidance Sector 8.65 Degrees

12 Glide Slope Considerations to Provide Support for Aircraft Certification for Steep Angle Approaches 12 of 27IFIS 2008, OKC Path Quality Summary Category Structure Roughness (μA / % Tolerance / nmi) ILS Zone 2ILS Zone 3 Path Angle 5.5 Degrees 5/12/ /66.5/ /14.8/0.23 III16.8/ /59.4/0.20 Path Angle 5.5 Degrees 8/27/07 I23.3 / 77.5 / / 15.9 / 0.18 III19.7 / 96.6 / / 23.9 / 0.18 Path Angle 6.65 Degrees 8/27/07 I9.9 / 33 / / 12.7 / 0.09 III9.9 / 48.5 / / 19.1 / 0.09 Path Angle 8.65 degrees 8/27/07 I9.0 / 30.1 / / 27.8 / 0.13 III8.5 / 42.4 / / 41.7 / 0.13

13 Glide Slope Considerations to Provide Support for Aircraft Certification for Steep Angle Approaches 13 of 27IFIS 2008, OKC Structure Roughness 5.5 Degrees

14 Glide Slope Considerations to Provide Support for Aircraft Certification for Steep Angle Approaches 14 of 27IFIS 2008, OKC Structure Roughness 6.65 Degrees

15 Glide Slope Considerations to Provide Support for Aircraft Certification for Steep Angle Approaches 15 of 27IFIS 2008, OKC Structure Roughness 8.65 Degrees

16 Glide Slope Considerations to Provide Support for Aircraft Certification for Steep Angle Approaches 16 of 27IFIS 2008, OKC Summary Localizer Performance ParameterFlight Measurement ResultsFlight Inspection Tolerance Width (degrees) Symmetry (%) Minimum Clearance 90 Hz (μA) (minimum) Minimum Clearance 150 Hz (μA) (minimum)

17 Glide Slope Considerations to Provide Support for Aircraft Certification for Steep Angle Approaches 17 of 27IFIS 2008, OKC Horizontal Sector

18 Glide Slope Considerations to Provide Support for Aircraft Certification for Steep Angle Approaches 18 of 27IFIS 2008, OKC Localizer Performance ILS Zone Structure Roughness (μA / % / nmi) Category ICategory III 22.6 / 13.6 / / 36.3 / / 13.8 / / 52.3 / N/A5.4 / / N/A2.9 / 36.9 / 0.59

19 Glide Slope Considerations to Provide Support for Aircraft Certification for Steep Angle Approaches 19 of 27IFIS 2008, OKC Course Quality

20 Glide Slope Considerations to Provide Support for Aircraft Certification for Steep Angle Approaches 20 of 27IFIS 2008, OKC Equipment Consideration –Path Angle Change –CEGS/M-Array: »Antenna heights »UA- amplitude/phase change »LA-amplitude/phase change »Snow accumulation –SBR: »Antenna heights »UA-amplitude change »LA-amplitude change »Snow accumulation –EFGS: »Pedestal displacement »Phase change [F-R] –

21 Glide Slope Considerations to Provide Support for Aircraft Certification for Steep Angle Approaches 21 of 27IFIS 2008, OKC Null Reference –Path Angle Change Upper Antenna Height [0.01° per 1”] –Verified height with tape measure Snow Accumulation

22 Glide Slope Considerations to Provide Support for Aircraft Certification for Steep Angle Approaches 22 of 27IFIS 2008, OKC Path Roughness Aircraft on Taxiways –No taxiways near mast Terrain Modification –Visual inspection SBO CSB Power Ratio –Test equipment

23 Glide Slope Considerations to Provide Support for Aircraft Certification for Steep Angle Approaches 23 of 27IFIS 2008, OKC 8-Element Array –Course Alignment Change Phase change in antenna cable or DU –Verified with ground checks Modulation Balance [0.001 DDM=> 2.3’ at threshold] –Verified using calibrated external equipment –Structure Roughness Constant –No change to environment [buildings/parked aircraft] in front of array »Visual inspection –No change in CSB/SBO power ratio »Verified using thru-line elements

24 Glide Slope Considerations to Provide Support for Aircraft Certification for Steep Angle Approaches 24 of 27IFIS 2008, OKC Signal Verification Based on ground measurements –Transmitter output power & modulation –In-line phase –GS antenna heights –Localizer ground checks (CL, width points) –Taken pre & post mission

25 Glide Slope Considerations to Provide Support for Aircraft Certification for Steep Angle Approaches 25 of 27IFIS 2008, OKC Path Angle Stability

26 Glide Slope Considerations to Provide Support for Aircraft Certification for Steep Angle Approaches 26 of 27IFIS 2008, OKC Structure Roughness

27 Glide Slope Considerations to Provide Support for Aircraft Certification for Steep Angle Approaches 27 of 27IFIS 2008, OKC Conclusions Localizer & Glide Slope remained within tolerances during all certification flights. Based on reference readings (antenna height); angle remained within degrees.


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