OBIGGS Utilization In Inaccessible Areas
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1OBIGGS Utilization In Inaccessible Areas April 16, 2007 Federal Aviation
Administration 1
OBIGGS Utilization In Inaccessible Areas
Steve Summer Project Engineer Federal Aviation AdministrationFire Safety Branch
Federal AviationAdministration
International Aircraft Systems Fire Protection Working GroupLondon, UK April 16, 2007
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2OBIGGS Utilization In Inaccessible Areas April 16, 2007 Federal Aviation
Administration 2
Background
• The FAA recently has released an NPRM requiring the reduction of flammability within heated fuel tanks (affecting over 3,200 in service aircraft)
• The most likely method of conformance is the utilization of an On Board Inert Gas Generating System (OBIGGS)
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3OBIGGS Utilization In Inaccessible Areas April 16, 2007 Federal Aviation
Administration 3
Background
• CAA Paper 2002/01 (FAA Reference DOT/FAA/AR-02/50) determined that 90% of non-survivable hidden area fires could be prevented if extinguished within 8 minutes
CUMULATIVE PROBABILITY DISTRIBUTION OF TIME TO BECOME NON-SURVIVABLE
0.000.100.200.300.400.500.600.700.800.901.00
0 10 20 30 40 50 60TIME MINUTES 1705 Final Repor t and Data Step 2.2 T ime NS
CU
MU
LATI
VE P
RO
BA
BIL
ITY
• 90% of hidden fires could be accommodated if the hidden area was inerted within 8 minutes
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4OBIGGS Utilization In Inaccessible Areas April 16, 2007 Federal Aviation
Administration 4
Background• With inerting systems now/soon to be on board, an integrated fire
protection system to provide protection for these hidden areas may be feasible
• Such a system would provide enhanced fire protection while utilizing a system already installed, thus saving on cost, weight and space on board the aircraft
PAX/CREWO2 SUPPLY
WATERSYSTEM
FUELTANKS
CARGOBAYSCABIN WHEEL
WELLSE/E BAYSINACCESSIBLE AREAS
OBIGGS/OBOGS
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5OBIGGS Utilization In Inaccessible Areas April 16, 2007 Federal Aviation
Administration 5
OBJECTIVES
• Design and install an NEA distribution system for fire protection of the overhead area of the FAAs 747SP and 737 test articles
• Examine the effect of various conditions on the ability of the OBIGGS to successfully protect the overhead area:
• Bleed air pressure• OBIGGS feed pressure• OBIGGS back pressure• Permeate pressure (altitude)• Ventilation• Etc.
• Future work may include expanding the OBIGGS system to other hidden areas aboard the aircraft (E/E bays, wheel wells, etc.)
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6OBIGGS Utilization In Inaccessible Areas April 16, 2007 Federal Aviation
Administration 6
TEST ARTICLES
• 747SP equipped with OBIGGS installed in the empty pack bay utilizing up to 6 ASMs
• 737 aircraft in process of being equipped with a single ASM OBIGGS
• Instrumentation allowing for monitoring of oxygen at 12 locations in overhead area of each aircraft
• NEA flow and purity also measured as well as various system pressures
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7OBIGGS Utilization In Inaccessible Areas April 16, 2007 Federal Aviation
Administration 7
TEST CONFIGURATION – 747SP
Current Test Section (STA 1241)
From OBIGGS
Vacuum Source
From OBIGGS
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8OBIGGS Utilization In Inaccessible Areas April 16, 2007 Federal Aviation
Administration 8
TEST SECTION – 747SP
• Located at approximately STA 1241
• Approximately 20 ft. wide, 5 ft. tall at center
• Cross-sectional area of approximately 42 ft2
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9OBIGGS Utilization In Inaccessible Areas April 16, 2007 Federal Aviation
Administration 9
TEST CONFIGURATION – 737
Current Test Section
From OBIGGS
From OBIGGS`
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10OBIGGS Utilization In Inaccessible Areas April 16, 2007 Federal Aviation
Administration 10
TEST SECTION – 737
• Approximately 9 ft. wide, 10 in. tall at center
• Cross-sectional area of approximately 3 ft2
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11OBIGGS Utilization In Inaccessible Areas April 16, 2007 Federal Aviation
Administration 11
CURRENT STATUS
• Preliminary testing on 747SP with a single NEA deposit location has confirmed the need for a vacuum source (or other method) to control the spread of NEA
• Vacuum pump has been installed in forward cargo bay of 747SP and is plumbed to test section
• OBIGGS and test instrumentation build up on 737 is underway