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Sound Testing Requirements For Zero Flight Time (Level D) Simulators

Sound Testing Requirements For Zero Flight Time (Level D) Simulators. By Mark Dransfield and David Haselum. Contents. Industry initiatives Current FFS sound requirements & regulations Draft Proposals Results of Assessment of Proposals The next steps , Summary & Conclusions.

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Sound Testing Requirements For Zero Flight Time (Level D) Simulators

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  1. Sound Testing Requirements For Zero Flight Time (Level D) Simulators By Mark Dransfield and David Haselum

  2. Contents • Industry initiatives • Current FFS sound requirements & regulations • Draft Proposals • Results of Assessment of Proposals • The next steps , Summary & Conclusions

  3. Industry Initiatives • Greater breadth of data available should enhance • Fidelity of simulation • Effective (objective) testing • Simulator Technical Issues Group (STIG) • Industry participation • A/c manufacturers • Simulator manufacturers & operators • Regulatory authorities • Output was a draft proposal for enhanced Level D testing

  4. Current FFS Sound Requirements • AC120-40B /C • Level C and below • Subjective assessment only (Pilot tuned) • Level D (zero flight time) • Subjective assessment • Static Tests only • No explicit tolerances • IQTG / JAR-STD1A / ICAO regulations • Level C & D requirements as above

  5. Draft Proposals • Static tests • Four different phases • Ambient - A/C systems powered only • Gear Extended - Landing phase , gear & flaps extended • Cruise - (VMO/MMO) • On ground static - Take-Off thrust against brakes • Test type required • Third Octave band analysis • Tolerances • Algorithm developed (+/- 5dB to 10 dB)

  6. Draft Proposals • Dynamic / Transient tests • 6 engine or configuration change tests • Engine start • Engine acceleration • Engine deceleration • Gear retraction • Gear extension • Thrust reverser operation (if applicable) • Airplane Specific Special Cases • Condition Lever Sweep (Turboprops) • Speedbrakes or other specifics

  7. Draft Proposals • Dynamic / Transient tests (Contd. ...) • Test type required • dBA Time history (typically 30 to 60 seconds) • Octave band spectral analysis on 3 to 5 of the transients • Representative cases & bands to be specified by a/c manufacturer • Tolerances • Time history plots +/- 3db • Octave band analysis +/- 2db or 20% (on significant octave band)

  8. Implementation • October 96 until present .... • Boeing flight test data provided for B777 (including dynamic tests) • Data analysed and incorporated • Checks developed on UAL B777 FFS • Initial results obtained • Pilot subjective assessment performed • FAA Level D achieved (static plots only)

  9. Findings • Static tests • Tolerances seem realistic & achievable • Add Climb condition? • Dynamic Tests • Time history tolerance (+/- 3dB) • Tight but achievable • Octave band analysis tolerance (+/- 2dB) • Very tight , difficult to achieve (+/- 6dB achieved) • Equipment expensive to hire and skilled operator required • Time consuming, little effect on pilot satisfaction • Some wording in proposal needs clarification • Allowance for Pilot subjective assessment required

  10. Next Steps • Feedback , discussion of results , comments , opinions from • A/c manufacturers • Simulator manufacturers • Pilot community • Refinement of Draft proposals • Further testing? • Adoption into regulations

  11. Summary & Conclusions • Draft proposal developed for enhanced testing of sound simulation for Level D FFS • Assessment completed on B777 device, with some concerns on ... • Tight tolerances for Octave band dynamic tests • Some wording open to interpretation • Costs in equipment and training • Initial versus recurrent approval requirements • Allowance for subjective tuning • Refine draft proposal with industry involvement • Adoption into regulations

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