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EASA HighIWC (EASA.2011.OP.28). Presented by Fabien Dezitter / Airbus Prepared by Alice Grandin, Fabien Dezitter / Airbus . EASA HighIWC Final Meeting. Comparison study between existing in-service events and proposed envelope. EASA- HighIWC Final Meeting Content. Introduction

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easa highiwc final meeting

EASA HighIWC (EASA.2011.OP.28)

Presented by

Fabien Dezitter / Airbus

Prepared by

Alice Grandin, Fabien Dezitter / Airbus

EASA HighIWC Final Meeting

Comparison study between existing in-service events and proposed envelope

EASA.2011.OP.28

easa highiwc final meeting content
EASA-HighIWC Final MeetingContent

EASA.2011.OP.28

Introduction

Engineevents

Air Data Probes events

Conclusion & Recommendations

easa highiwc final meeting content1
EASA-HighIWC Final MeetingContent

EASA.2011.OP.28

Introduction

Engineevents

Air Data Probes events

Conclusion & Recommendations

easa highiwc final meeting introduction
EASA-HighIWC Final MeetingIntroduction

EASA.2011.OP.28

  • Objectives: To perform a comparison study between existing in-service events and proposed envelope, to identify areas which require a further amendment/extension of the envelope.
  • Pending on the type of technology, the reported in-service events are not occurring in the same conditions and thus, two types of in-service events are considered in this section:
    • Engine in-service events
    • Air Data Probes in-service events
easa highiwc final meeting content2
EASA-HighIWC Final MeetingContent

EASA.2011.OP.28

Introduction

Engineevents

Air Data Probes events

Conclusion & Recommendations

easa highiwc final meeting engine events
EASA-HighIWC Final MeetingEngineevents

Extract from Technical Compendium from meetings of the Engine Harmonization Working Group DOT/FAA/AR-09/13

EASA.2011.OP.28

Analysis made by the EHWG of the international database of engine in-service events led to the recommendations at the basis of proposed envelope.

No engine in-service event had been reported outside of the proposed envelope (altitude – SAT envelope)

Due to lack of information available on the concentration of water during the in-service events, no evaluation of proposed envelope for TWC values can be made.

easa highiwc final meeting content3
EASA-HighIWC Final MeetingContent

EASA.2011.OP.28

Introduction

Engineevents

Air Data Probes events

Conclusion & Recommendations

easa highiwc final meeting air data probes events
EASA-HighIWC Final MeetingAir Data Probes events

Airbus ISRO (In Service Reported Occurrence)

EASA.2011.OP.28

easa highiwc final meeting air data probes events1
EASA-HighIWC Final MeetingAir Data Probes events
  • Altitude vs. Temperature Domain
    • AIRBUS has observed 6 in-service events of Pitot icing in high-altitude icing conditions that were outside of the Appendix D envelope.
  • Therefore, Airbus has proposed an extended envelope (blue dotted polygon) for glaciated icing conditions.
  • Size of Typical Cloud
    • The Appendix D provides TWC concentration values scaled for a 17.4 NMcloud. AIRBUS considers that these 17.4 NM scaled values are not applicable to a pitot probe.
  • For a pitot probe, Airbus believes that the peak TWC concentration values have to be considered instead of the 17.4 NM values.

EASA.2011.OP.28

easa highiwc final meeting content4
EASA-HighIWC Final MeetingContent

EASA.2011.OP.28

Introduction

Enginein-service events

Air Data Probes in-service events

Conclusion & Recommendations

easa highiwc final meeting conclusion recommendations
EASA-HighIWC Final MeetingConclusion & Recommendations
  • To be able to evaluate proposed envelopes, Airbus has reviewed existing in-service events. Pending on the type of technology, the reported in-service events are not occurring in the same conditions and thus, two types of in-service events were considered.
  • Engine in-service events
    • Analysis made by the EHWG of the international database of engine in-service events led to the recommendations at the basis of proposed envelope.
    • No engine in-service event had been reported outside of the proposed envelope (altitude – SAT envelope).
    • Due to lack of information available on the concentration of water during the in-service events, no evaluation of proposed envelope for TWC values can be made.

EASA.2011.OP.28

easa highiwc final meeting conclusion recommendations1
EASA-HighIWC Final MeetingConclusion & Recommendations

EASA.2011.OP.28

  • Air Data Probes in-service events
    • For sizing and qualification of air data probes, Airbus recommends the extension of proposed envelopes regarding mixed phase and glaciated icing conditions.
      • Extension of altitude-temperature envelope.
      • Use of Peak values instead of 17.4Nm scaled values for TWC.
  • Nevertheless, to perform a statistical approach for the analysis of proposed envelopes in terms of concentrations, additional results and measurements of the atmosphere are needed. International field campaign should fill this gap and provide the necessary data for rulemaking activities and evaluation of proposed envelopes
slide13

Ice Water Content of clouds at High altitude (EASA HighIWC, EASA.2011.OP.28)

This document and the information contained are EASA HighIWC Contractors’ property and shall not becopied or disclosed to any third party without EASA HighIWC Contractors’ prior written authorization

Project funded by the European Aviation SafetyAgency(EASA)

EASA.2011.OP.28