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Federal Aviation Administration. Flammability Reduction Methods: Compliance Options. AAR-440 Fire Safety Branch Wm. J. Hughes Technical Center Federal Aviation Administration. Reticulated Foam. Advantages:. 100% protection Passive System No model – no need for flight testing.

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slide1

Federal Aviation

Administration

Flammability Reduction Methods: Compliance

Options

AAR-440 Fire Safety BranchWm. J. Hughes Technical CenterFederal Aviation Administration

slide2

Reticulated Foam

Advantages:

  • 100% protection
  • Passive System
  • No model – no need for flight testing

Disadvantages:

  • Weight
  • Fuel displacement
  • Interference with maintenance
  • Haz. Mat. When out of tank

Certification issues:

  • Foam pedigree
  • Voiding
  • Durability
  • Interference in tank
slide3

Inerting with Stored CO2

Advantages:

  • ?

Disadvantages:

  • Must be stored on aircraft

Certification issues:

  • Needed O2 concentration not known
  • Fuel solubility
  • Effect on pumps
slide4

Inerting with Exhaust Gas

Advantages:

  • Already produced on aircraft

Disadvantages:

  • How to obtain

Certification issues:

  • Needed O2 concentration unknown
  • Contaminants unknown
slide5

Catalytic Inerting

Advantages:

  • Possible weight
  • Less power from aircraft
  • environmental

Disadvantages:

  • ?

Certification issues:

  • Needed O2 concentration not known
  • Fuel solubility
  • Effect on pumps
slide6

Rapid Ventilation

Advantages:

  • Cost
  • Weight

Disadvantages:

  • Loss of fuel
  • Environmental
  • Need for in-tank monitoring

Certification issues:

  • Tank flammability verification
slide7

Misting Fuel Vapor

Advantages:

  • Possible weight savings
  • Possible lower cost

Disadvantages:

  • Loss of fuel
  • Environmental
  • Safety issues

Certification issues:

  • Post crash implications
  • Failure modes
  • In-tank hydrocarbon measurements
slide8

Nitrogen Inerting

  • Cryogenic Nitrogen
  • High Pressure Stored Nitrogen
  • Ground Based Nitrogen
  • Two Flow Nitrogen
  • Full Time On Demand Nitrogen
slide9

Cryogenic Nitrogen

Stored: Too heavy

Manufactured: Developing technology

ground based nitrogen
Ground Based Nitrogen
  • Logistics
  • Manpower
full time on demand nitrogen
Full Time On Demand Nitrogen
  • Advantages:
    • Less power from aircraft
    • Environmental

Disadvantages:

  • Weight
  • Vent valve
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