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Engine Nacelle Halon Replacement, FAA, WJ Hughes Technical Center

International Aircraft Systems Fire Protection Working Group Seattle-Tacoma Airport, WA 12-13 March 2002. Federal Aviation Administration WJ Hughes Technical Center, Fire Safety Section, AAR-422 Atlantic City Int'l Airport, NJ 08405 USA.

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Engine Nacelle Halon Replacement, FAA, WJ Hughes Technical Center

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  1. International Aircraft Systems Fire Protection Working Group Seattle-Tacoma Airport, WA 12-13 March 2002 Federal Aviation Administration WJ Hughes Technical Center, Fire Safety Section, AAR-422 Atlantic City Int'l Airport, NJ 08405 USA Engine Nacelle Halon Replacement,FAA, WJ Hughes Technical Center Point of Contact : Doug Ingerson Department of Transportation Federal Aviation Administration WJ Hughes Technical Center Fire Safety Section, AAR-422 Bldg 205 Atlantic City Int'l Airport, NJ 08405 USA tel: 609-485-4945 fax: 609-485-7074 email: Douglas.A.Ingerson@tc.faa.gov web page: http://www.fire.tc.faa.gov/

  2. International Aircraft Systems Fire Protection Working Group Seattle-Tacoma Airport, WA 12-13 March 2002 Federal Aviation Administration WJ Hughes Technical Center, Fire Safety Section, AAR-422 Atlantic City Int'l Airport, NJ 08405 USA Three Major Topics for Review : progress/current status presentation of recent data near term plans

  3. International Aircraft Systems Fire Protection Working Group Seattle-Tacoma Airport, WA 12-13 March 2002 Federal Aviation Administration WJ Hughes Technical Center, Fire Safety Section, AAR-422 Atlantic City Int'l Airport, NJ 08405 USA • PROGRESS/CURRENT STATUS • Test Fixture • Fuel System • Prior system to heat the fuel and deliver it to the nozzles in the spray fire zone deemed inadequate • Replaced pump for fuel heating; heating time changes from 1+ hours to 20 minutes • Replace pump for spray nozzles w/pressurized ullage system • Fuel nozzles will be changed to alter flow rate to the spray fire zone • Fire Extinguisher • Equilibrium system in place • Agent/N2 solubility is a notable phenomena • Firex servicing procedures now account for agent/N2 behavior • Distribution plumbing altered to decrease discharge duration

  4. International Aircraft Systems Fire Protection Working Group Seattle-Tacoma Airport, WA 12-13 March 2002 Federal Aviation Administration WJ Hughes Technical Center, Fire Safety Section, AAR-422 Atlantic City Int'l Airport, NJ 08405 USA • PROGRESS/CURRENT STATUS • Test Fixture (cont’d) • Hot plates • Spray hot plate failed 15Oct01 • Process control thermocouples separate from plate; significant overheat results • Difficulties repaired; operational 7Nov01 • Electrical circuit for the pool hot plate faulted 31Jan02 • Plate removed, reason for fault found and corrected • Operational 5Feb02

  5. International Aircraft Systems Fire Protection Working Group Seattle-Tacoma Airport, WA 12-13 March 2002 Federal Aviation Administration WJ Hughes Technical Center, Fire Safety Section, AAR-422 Atlantic City Int'l Airport, NJ 08405 USA • PRESENTATION OF RECENT DATA • Data Presentation • Fire Extinguishing System • Problems w/past distribution results required system evaluation • Evaluation produced the following areas likely causing the difficulty • Distribution plumbing • Agent/N2 equilibrium • The resultant changes in the system yielded positive gains in performance • Increased the the cross sectional area of the discharge pathway for the agent flow • The single flow split in the discharge pathway changed from a tee to a wye • Agent/N2 equilibrium behavior calculated (NIST computer program PROFISSY) • Agent/N2 equilibrium attained prior to test discharge

  6. 8” C/L-C/L 8” C/L-C/L International Aircraft Systems Fire Protection Working Group Seattle-Tacoma Airport, WA 12-13 March 2002 Federal Aviation Administration WJ Hughes Technical Center, Fire Safety Section, AAR-422 Atlantic City Int'l Airport, NJ 08405 USA PRESENTATION OF RECENT DATA From firex ball valve From firex ball valve 1.25”OD TEE AS FLOW SPLIT 1.25”OD WYE AS FLOW SPLIT • 1/2” TUBE BUTT FOR NOZZLES 1/2”OD tube 5/8”OD tube • 5/8” TUBE BUTT FOR NOZZLES • NOZZLES FARTHEST FROM CORE RESTRICTED BY 5/8”ODx3/8”ID WASHER Within Test Fixture Interior

  7. International Aircraft Systems Fire Protection Working Group Seattle-Tacoma Airport, WA 12-13 March 2002 Federal Aviation Administration WJ Hughes Technical Center, Fire Safety Section, AAR-422 Atlantic City Int'l Airport, NJ 08405 USA PRESENTATION OF RECENT DATA “Top-off” is the total pressure of the agent/N2 mixture when the system is in equilibrium for the given temperature.

  8. International Aircraft Systems Fire Protection Working Group Seattle-Tacoma Airport, WA 12-13 March 2002 Federal Aviation Administration WJ Hughes Technical Center, Fire Safety Section, AAR-422 Atlantic City Int'l Airport, NJ 08405 USA PRESENTATION OF RECENT DATA

  9. International Aircraft Systems Fire Protection Working Group Seattle-Tacoma Airport, WA 12-13 March 2002 Federal Aviation Administration WJ Hughes Technical Center, Fire Safety Section, AAR-422 Atlantic City Int'l Airport, NJ 08405 USA • PRESENTATION OF RECENT DATA • Data Presentation (cont’d) • Gas Analysis • Analyzer completed; known as “Hal2 Rebuilt” • Producing data from transducers as a Direct Current Voltage (VDC) history • Sensor signal starts at a maximum value; as gas concentration increases, signal decreases (converse behavior applies) • Data manipulation • Raw signal run through a smoothing routine • Smoothed data aligned at some consistent signal value • All 12 channels reviewed as one distribution profile • Second review of data incorporates the minimum and maximum values for each time increment

  10. International Aircraft Systems Fire Protection Working Group Seattle-Tacoma Airport, WA 12-13 March 2002 Federal Aviation Administration WJ Hughes Technical Center, Fire Safety Section, AAR-422 Atlantic City Int'l Airport, NJ 08405 USA PRESENTATION OF RECENT DATA

  11. International Aircraft Systems Fire Protection Working Group Seattle-Tacoma Airport, WA 12-13 March 2002 Federal Aviation Administration WJ Hughes Technical Center, Fire Safety Section, AAR-422 Atlantic City Int'l Airport, NJ 08405 USA PRESENTATION OF RECENT DATA as of 25Feb02... Ring location ch# - clock position FWD MID AFT 11-12:00 05-1:00 10-12:00 09-3:00 03-4:30 12-3:00 04-6:00 01-7:30 02-6:00 08-9:00 06-11:00 07-9:00

  12. International Aircraft Systems Fire Protection Working Group Seattle-Tacoma Airport, WA 12-13 March 2002 Federal Aviation Administration WJ Hughes Technical Center, Fire Safety Section, AAR-422 Atlantic City Int'l Airport, NJ 08405 USA PRESENTATION OF RECENT DATA

  13. International Aircraft Systems Fire Protection Working Group Seattle-Tacoma Airport, WA 12-13 March 2002 Federal Aviation Administration WJ Hughes Technical Center, Fire Safety Section, AAR-422 Atlantic City Int'l Airport, NJ 08405 USA PRESENTATION OF RECENT DATA

  14. International Aircraft Systems Fire Protection Working Group Seattle-Tacoma Airport, WA 12-13 March 2002 Federal Aviation Administration WJ Hughes Technical Center, Fire Safety Section, AAR-422 Atlantic City Int'l Airport, NJ 08405 USA • NEAR TERM PLANS • Test Activity • Gas Analysis • Cold agent testing on-going since latter Feb ‘02 • Difficulty getting agent temperature to -65°F • Process refined • Testing continuing now (12-15March02) • Will find acceptable distribution profiles for two air flow conditions • Air flow conditions => high flow/low temperature & low flow/high temperature • Closure analysis will include : • Distribution profile measurements at agent storage conditions during fire testing • Distribution profile measurements for agent storage conditions at depressed temperature

  15. International Aircraft Systems Fire Protection Working Group Seattle-Tacoma Airport, WA 12-13 March 2002 Federal Aviation Administration WJ Hughes Technical Center, Fire Safety Section, AAR-422 Atlantic City Int'l Airport, NJ 08405 USA • NEAR TERM PLANS • Test Activity (cont’d) • Fire Testing • Will follow on immediately after agent distribution work at depressed temperature is completed (mid-March ‘02) • Basic fire characterizations completed

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