Rnav approach amc status
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RNAV approach AMC Status. B. RABILLER DGAC/DCS CNS/ATM Steering group meeting Brussels 01-02 July 08. AMC Status. RNP APCH AMC 20-XX  AMC 20-27 Includes APV Baro VNAV airworthiness and OPS criteria Vertical Total system error clarified Vertical Fly by capability clarified

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RNAV approach AMC Status

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Rnav approach amc status

RNAV approachAMC Status

B. RABILLER DGAC/DCS

CNS/ATM Steering group meeting

Brussels

01-02 July 08


Amc status

AMC Status

  • RNP APCH

    • AMC 20-XX  AMC 20-27

    • Includes APV Baro VNAV airworthiness and OPS criteria

      • Vertical Total system error clarified

      • Vertical Fly by capability clarified

    • NPA 2008-14 issued (dated 26 May 2008)

  • LPV

    • No change from last meeting

      • AMC 20-LPV Draft 1.2.

    • New EASA Rulemaking tasking is awaited


Amc status1

AMC Status

  • RNP AR APCH

    • AMC 20-XZ  AMC 20-26

    • A/C failure effects on the navigation performance have been refined:

      • A/C remains in the 1xRNP corridor when probable failure occured

      • A/C remains in the 1xRNP corridor in OEI condition

      • A/C remains in the 2xRNP corridor when remote failure occured

      • A/C remains manoeuvrable and a safe extraction may be flown when extremely remote failure occured

    • NPA 2008-14 issued (dated 26 May 2008)


Amc 20 27 vertical tse clarification 1 2

Vertical Total System Error requirement driven by consistency with the procedure design criteria

Vertical TSE compatible with the obstacle clearance criteria

Vertical clearance of 322 ft is intended to accommodate a 3σ TSE with an additional buffer

VPA (3°)

Max vertical clearance = 322 ft

VPA + T° correction

MOCApp

FAS Obstacle protection

ATT error

MOCApp = 75m (246ft)

ATT error = 556m (1824ft)

AMC 20-27Vertical TSE clarification (1/2)

Vertical TSE (3) + Buffer

PANS OPS


Amc 20 27 vertical tse clarification 2 2

AMC 20-27Vertical TSE clarification (2/2)

  • The Vertical Total System Error (using the Root Sum Square of all errors components) on a 99.7percent probability basis is as follow:

More stringent compared to AC 20-129

Vert TSE(3) + Buffer = 322 ft ( on a 3° path)

For instance, buffer = 100 ft for airport at altitude < 5000 ft


Amc 20 27 vertical fly by transition capability clarification

AMC 20-27Vertical Fly By transition capability clarification

  • Capability to automatically intercept the vertical path at the FAP using a vertical fly by technique

  • Required or recommended ?

    • This capability is a recommended Function

FAP


Npa 2008 14 amc 20 27

NPA 2008-14/ AMC 20-27

  • Document slighly amended by EASA compared to the submitted document

  • Comments before end of August

    ---------------------------------------------------------------

  • My comments:

    • The main comment is associated to Appendix 4 which is considered in the AMC as an airworthiness appendices whereas it is an operational section.

    • Other comments

      • VNAV equipment error should be 150 ft instead of 220 ft for altitude between 10000 and 15000ft (para 6.3.2.b)

      • ……


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