Aerodrome operating minima head up displays enhanced vision systems
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Aerodrome Operating Minima Head-Up Displays Enhanced Vision Systems. NPA-OPS 41. Presenters. Robert-Jan Venema (CAA NL) Chairman, AWOSG Tim Price (AEA / British Airways) Secretary, AWOSG [Bo Eckerbert (LS Sweden) Retiring Chairman, AWOSG]. Organisations Participating.

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Aerodrome Operating Minima Head-Up Displays Enhanced Vision Systems

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Aerodrome Operating MinimaHead-Up DisplaysEnhanced Vision Systems



  • Robert-Jan Venema (CAA NL)

    • Chairman, AWOSG

  • Tim Price (AEA / British Airways)

    • Secretary, AWOSG

  • [Bo Eckerbert (LS Sweden)

    • Retiring Chairman, AWOSG]

Organisations Participating

  • AWOSG Member Organisations:

    • CAA NL*

    • LS (Sweden)*

    • DGAC (France)

    • CAA UK

    • FAA*

    • AEA (British Airways, BMI, Air France, KLM*)

    • IFALPA (Braathens)

    • EAG UK

    • Jeppesen

      (* ICAO Panel Members)


  • OST endorsed NPA OPS 41 in May 05

  • Editorial and harmonisation work

  • Workshop for industry on 10 Nov 05

  • OST further endorsement 30 Nov 05

  • RST endorsement end 05

  • Public Consultation 1 Mar – 31 May 06

  • Revision of NPA in light of CRD

Contents of Today’s Presentation

  • Rationale for NPA 41

    • Contents of the NPA

    • Stabilised Approach

    • Continuous Descent Final Approach

  • Harmonisation work

  • Comment Response Period

  • Detailed Rule & ACJ changes following on from CRD

  • Conclusion


  • The proposal contains draft texts for:

    • Aerodrome Operating Minima (1.430)

      • Comments received post NPA 20, OST, Workshop

      • JAA / FAA harmonisation work (ongoing)

    • Requirements for Cat I, II and III Operations (1.440 and Appendix)

      • JAA / FAA harmonisation work

    • Introduction of HUD & HUDLS

    • Introduction of EVS

    • Training and qualification requirements for all of the above (1.450)

Stabilised Approach - Background

  • CFIT & ALARP programmes encouraged authorities to prescribe stabilised approach criteria

  • SAp: An approach which is flown in a controlled and appropriate manner in terms of configuration, energy and control of the flight path from a pre-determined point or altitude/height down to a point 50 feet above the threshold or the point where the flare manoeuvre is initiated if higher.

Stabilised Approach and CDFA

  • NPA 20 / 41 defines a new method of meeting the Stabilised Approach criteria: the Continuous Descent Final Approach (CDFA) technique

  • A specific technique for flying the final-approach segment of a non-precision instrument approach procedure as a continuous descent, without level-off, from an altitude / height at or above the Final Approach Fix altitude / height to a point approximately 15m (50ft) above the landing runway threshold or the point where the flare manoeuvre should begin for the type of aeroplane flown.

CDFA and SAp - Benefits

  • The CDFA technique aims to increase the safety of inter alia Non-Precision Approaches by eliminating level flight at MDA, ie close to the ground

  • Pilot workload is reduced as a/c attitude, power and energy are stabilised

  • One ‘decision point’ for the pilot

  • The intention is that all approaches should be flown using the CDFA technique (if physically possible)




Decision Point




CDFA Technique v ‘Dive & Drive’ NPA

Continuous descent from FAF; no level-flight segment at MDH

Harmonisation Work

  • Further meeting of JAA / FAA AWO Harmonisation Working Group in Mar 05

  • FAA members participated in AWOSG meetings

  • FAA will soon publish revised Ch 3 of TERPS (harmonised AOM) for consultation

  • NPA41 represents the European end of the harmonisation process; hence, it is of vital importance

Comment Response Period

  • About 200 responses received

    • Hard to be precise: some were multiple comments on one form

  • Very useful process: much help to the AWOSG from interested parties

  • Most important: none of the comments said ‘this is rubbish, get rid of it!’

  • All were supportive

  • Thank you to all who commented

Detailed Rule, Appendix and ACJ ChangesFrom CRD


  • No major change has occurred as a result of the Comment Period

  • The changes fall into 3 main categories:

    • Editing of the English (many thanks to UK CAA for very detailed editorial comments)

    • Clarification of what constitutes an approach operation, and the techniques which may be employed to fly an approach

    • Some better definitions

Changes - CDFA Technique

  • Continuous Descent Final Approach

    • A specific technique for flying the last part of an instrument approach (as proposed by ICAO OPSP/7, May 06)

    • Not an approach operation in itself

    • This clarification is applied throughout the NPA41 document, notably in the appropriate ACJ

  • Important clarification

Changes -Enhanced Vision Systems

  • An approach may be flown utilising EVS guidance to obtain lower minima

  • There is no such thing as ‘an EVS approach’

  • Another important clarification

Better definitions

  • JAR OPS 1.435 Terminology

    • (9) CDFA

    • (11) HUD

    • (14) EVS

    • (17) Other than Standard Cat II Operation

    • (18) GNSS Landing System [new]

Other changes

  • Appendix 1 to 1.430

    • (c)Criteria for establishing RVR / Converted Met Visibility clarified

    • (d)(5) Clarification of the requirements for allowing an RVR of <750m

    • Table 4. Lighting-system definitions improved and aligned with ICAO

    • (f) Requirements for Cat II and OS Cat II clarified

    • (j) Requirements for Circling clarified

  • ACJs improved


  • No major changes have been made since OST 05/2

  • Many of the items have been endorsed separately by the OST at various times in the past:

    • Circling ACJ

    • HUD material

    • NPA 20

    • NPA 41 (first draft; reworking)

  • This major reworking of Sub Part E is overdue and should be well received by the aviation community


Robert-Jan Venema (

Tim Price (

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