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The ICASC Technical Working Group View on R-NAV DME/DME Flight Inspection

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Title: The ICASC Technical Working Group View on R-NAV DME/DME Flight Inspection 1 The ICASC Technical Working Group View on R-NAV DME/DME Flight Inspection
  • International Flight Inspection Symposium
  • Oklahoma City, OK USA June 2008
  • Mike SpannerHervé Renouf 2 Reminder
  • In addition to traditional applications, avionics have been developed that can interrogate multiple DME enabling determination of aircraft position
  • B-RNAV 5 Nm 95
  • P-RNAV (aka RNAV1) 1 Nm 95
  • ?Two Navigation Aids or Sensors GNSS and DME/DME
  • (DME/DME used as back-up for GNSS)
  • ? For DME/DME each combination of navigation aid needs to be assessed and potentially inspected
  • 3 DME/DME Navigation Example DME Out of range DME 1 DME Out of range DME 2 Combinations 1 2 not OK 2 4 OK 1 4 OK DME 4 4 FI of DME/DME procedures
  • Flight Inspection of DME/DME procedures was identified as an issue of concern for ANSP and FI providers
  • Presentation of ICASC technical working group view
  • Documents
  • Implementation for a FI organisation
  • Role of FI Principles
  • Input / Output list
  • Equipment
  • Examples
  • Recommendations
  • 5 DME/DME flight inspectionReference Documents
  • The ITWG identified a list of documents on DME/DME Flight inspection
  • (Ref. Published paper)
  • Eurocontrol Guidance Material for P-RNAV Infrastructure Assessment found to be a good reference
  • (Summary in published paper)
  • 6 Connection between documents 7 Procedure design process Collate data concerning navaid infrastructure, obstacles and aerodrome Procedure Design Office/ Procedure owner/ Navaid Engineering Office Supplied by approved surveyor/ airport/ government department Close cooperation with Navaid Service Provider and Users Design procedure Procedure Design Office Conduct independent review of design and check flyability if design is non-standard May be done by a third party Procedure Design Office Collate and check data to be issued to flight inspection organisation Procedure Design Office/ Procedure owner/ Navaid Engineering Office Define Inputs Flight inspection organisation See also ICAO Doc 8071 Conduct Flight inspection Analyse flight inspection report. Re check flyability if necessary Procedure Design Office/ Navaid Engineering Office Mainly for navaid coverage but may also address obstacle assessment and flyability Define Outputs Obtain approval for publication Procedure owner/ AIS/ Regulator Publish procedure and monitor operational application Procedure owner/ AIS/ ATC/ Procedure Design Office 8 Input list
  • Required
  • Identification of critical DMEs
  • Intended procedure (WP data and position of DMEs)
  • List of DMEs that are part of the procedure design
  • Identification of facilities that are to be used outside of their currently defined operational volumes
  • Desirable
  • Predicted coverage of DMEs to be inspected
  • Consideration of expanded service volumes
  • List of restrictions applicable to the DMEs under inspection
  • Review of existing DME Flight Inspection records
  • 9 Output list
  • Required
  • Basic DME accuracy
  • Signal in space, peak power pulse density
  • Operational (designated operational coverage, consideration of Extended Service Volume)
  • Critical DME performance
  • scanning or individual fixed mode
  • Potential DME interference
  • Feedback to Procedure designer
  • Notification of any DME that causes the PEE to exceed tolerance
  • Desirable
  • PEE for measured sample
  • TSE for measured sample
  • Location of DME unlocks
  • DME/DME or DME/DME/IRU
  • Flyability
  • Validation of DME/DME modelling
  • Comparison of FMS vs Flight Inspection System
  • 10 Important issues for DME/DME
  • Software tool highly recommended
  • identify individual qualifying DME facilities
  • determine which DME are within line of sight
  • define all possible combinations of pairs at each point usable by FMS (3NMrange160NM, angle 40)
  • evaluate the subtended angle (30 ? 150)
  • calculate the PEE (must be 0.866)
  • identify critical DME
  • 11 Flight Inspection Role
  • Confirm
  • signal in space compliance with ICAO Annex 10
  • initial assessment made by the software tool
  • It is generally sufficient to flight inspect the procedure on the defined path at the lowest published altitude
  • ? It is not necessary to flight inspect the totality of the procedures if the number of suitable DMEs are sufficient
  • ? According to experts experience and previous results, some flight inspection may be omitted or indeed increased
  • 12 Flight Inspection Equipment
  • It is recommended to use a Flight inspection equipment with the capability to record multiple DME simultaneously and accurately
  • Independent single channel transponders
  • Record Signal in Space and range errors
  • Scanning DME transponders
  • Record range errors only, use lock status for analysis
  • Spectrum analysis of the entire L band
  • Record Signal in Space and assess multipath
  • 13 Eg Nice P-RNAV DME/DME SIDs 14 Ex Nice P-RNAV DME/DME SIDs NICE SID 22 15 Predicted Coverage Predicted loss of lt 3 DMEs at this point 16 Actual Coverage after flight COULEUR Nombre de paires de DME 0 1 2 3 4 5 à 8 9 à 11 gt 12 Actual result confirmed lt 3 DMEs at this point NICE SID 22 17 A few recommendations
  • When commissioning R-NAV procedures it is prudent to
  • Check the real world
  • Detect potential interference
  • Clearly define the boundaries of FI
  • Use modelling techniques to reduce flying time (using a validated model)
  • Consider the content of Eurocontrol P-RNAV, FAA 8200 and DOC 8071
  • 18 Conclusions
  • Use of DME/DME RNAV procedures are increasing throughout the World
  • The ICASC paper presents some guidance to standardise the methods and processes used to check those procedures
  • No further detailed work on this subject is planned for the ITWG, however
  • 19 Thanks for your attention !
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