engine nacelle halon replacement, faa, wj hughes technical center
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
Engine Nacelle Halon Replacement,FAA, WJ Hughes Technical Center
Point of Contact : Doug Ingerson
Department of TransportationFederal Aviation Administration
WJ Hughes Technical CenterFire Safety Section, AAR-422
Bldg 205Atlantic City Int'l Airport, NJ 08405 USA
tel: 609-485-4945fax: 609-485-7074email: [email protected] page: http://www.fire.tc.faa.gov/
International Aircraft Systems Fire Protection Working GroupSeattle-Tacoma Airport, WA 12-13 March 2002
Federal Aviation AdministrationWJ 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
International Aircraft Systems Fire Protection Working GroupSeattle-Tacoma Airport, WA 12-13 March 2002
Federal Aviation AdministrationWJ 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
International Aircraft Systems Fire Protection Working GroupSeattle-Tacoma Airport, WA 12-13 March 2002
Federal Aviation AdministrationWJ 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 resultsDifficulties repaired; operational 7Nov01
Electrical circuit for the pool hot plate faulted 31Jan02Plate removed, reason for fault found and correctedOperational 5Feb02
International Aircraft Systems Fire Protection Working GroupSeattle-Tacoma Airport, WA 12-13 March 2002
Federal Aviation AdministrationWJ 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 plumbingAgent/N2 equilibrium
The resultant changes in the system yielded positive gains in performanceIncreased the the cross sectional area of the discharge pathway for the agent flowThe single flow split in the discharge pathway changed from a tee to a wyeAgent/N2 equilibrium behavior calculated (NIST computer program PROFISSY)Agent/N2 equilibrium attained prior to test discharge
International Aircraft Systems Fire Protection Working GroupSeattle-Tacoma Airport, WA 12-13 March 2002
Federal Aviation AdministrationWJ Hughes Technical Center, Fire Safety Section, AAR-422
Atlantic City Int'l Airport, NJ 08405 USA
PRESENTATION OF RECENT DATA
1.25”OD WYEAS FLOW
SPLIT
5/8”OD tube
From firexball valve
1.25”OD TEEAS FLOW
SPLIT
From firex
ball valve
• 1/2” TUBE BUTT FOR NOZZLES
8” C/L-C/L8” C/L-C/L
1/2”OD tube
Within TestFixture Interior
International Aircraft Systems Fire Protection Working GroupSeattle-Tacoma Airport, WA 12-13 March 2002
Federal Aviation AdministrationWJ Hughes Technical Center, Fire Safety Section, AAR-422
Atlantic City Int'l Airport, NJ 08405 USA
• 5/8” TUBE BUTT FOR NOZZLES
• NOZZLES FARTHEST FROM CORE RESTRICTED BY 5/8”ODx3/8”ID WASHER
PRESENTATION OF RECENT DATAAgent/N2 Equilibrium Behavior
100
200
300
400
500
600
700
800
900
1000
1100
0 60 120 180 240
Time (min)
Pres
sure
(psig
)
-30
-20
-10
0
10
20
30
40
50
60
70
Age
nt/N
2 M
ixtur
e Te
mpe
ratu
re (°
F)
in firex, agent/N2 mixture in firex, "top-off" in equilibrium accumulator, agent/N2 mixture
in equilibrium accumulator, "top-off" mixture temperature mixture temperature
pr02
3C.x
ls
“Top-off” is the total pressure of the agent/N2 mixture when the system is in equilibrium for the given temperature.
International Aircraft Systems Fire Protection Working GroupSeattle-Tacoma Airport, WA 12-13 March 2002
Federal Aviation AdministrationWJ Hughes Technical Center, Fire Safety Section, AAR-422
Atlantic City Int'l Airport, NJ 08405 USA
PRESENTATION OF RECENT DATAImprovement of the Agent Discharge Duration
-100
0
100
200
300
400
500
600
700
20 22 24 26 28 30 32 34 36 38 40 42 44Time (sec)
Tem
p (°
F) a
nd P
res
(psi
g)
6 lb @ 51.8 lb/ft^3 3.5 lb @ 59.6 lb/ft^3 past plumbing, 3.7 lb @ 63.6 lb/ft^3
pr02
3C.x
ls
International Aircraft Systems Fire Protection Working GroupSeattle-Tacoma Airport, WA 12-13 March 2002
Federal Aviation AdministrationWJ 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 routineSmoothed data aligned at some consistent signal valueAll 12 channels reviewed as one distribution profileSecond review of data incorporates the minimum and maximum values for each time increment
International Aircraft Systems Fire Protection Working GroupSeattle-Tacoma Airport, WA 12-13 March 2002
Federal Aviation AdministrationWJ Hughes Technical Center, Fire Safety Section, AAR-422
Atlantic City Int'l Airport, NJ 08405 USA
PRESENTATION OF RECENT DATAComparing Raw and Smoothed Signal Data
3.5
3.6
3.7
3.8
3.9
4.0
4.1
4.2
4.3
4.4
4.5
5 7 9 11 13 15 17 19 21 23
Time (s)
Sens
or S
igna
l (VD
C)
Ch# 01, smooth Ch# 05, smooth Ch# 09, smooth RawData Ch1 RawData Ch5 RawData Ch9
NSa
0230
5_10
International Aircraft Systems Fire Protection Working GroupSeattle-Tacoma Airport, WA 12-13 March 2002
Federal Aviation AdministrationWJ Hughes Technical Center, Fire Safety Section, AAR-422
Atlantic City Int'l Airport, NJ 08405 USA
PRESENTATION OF RECENT DATAAgent Distribution Profile, HFC-125
3.4
3.5
3.6
3.7
3.8
3.9
4.0
4.1
4.2
31 32 33 34 35 36 37 38 39
Time (s)
Sens
or S
igna
l (VD
C)
Ch# 11
Ch# 09
Ch# 04
Ch# 08
Ch# 05
Ch# 03Ch# 01
Ch# 06Ch# 10
Ch# 12
Ch# 02
Ch# 07
CertificationActual
NSa
0230
5
as of 25Feb02...Ring location
ch# - clock position FWD MID AFT
11-12:00 05-1:00 10-12:0009-3:00 03-4:30 12-3:00 04-6:00 01-7:30 02-6:00 08-9:00 06-11:00 07-9:00
International Aircraft Systems Fire Protection Working GroupSeattle-Tacoma Airport, WA 12-13 March 2002
Federal Aviation AdministrationWJ Hughes Technical Center, Fire Safety Section, AAR-422
Atlantic City Int'l Airport, NJ 08405 USA
PRESENTATION OF RECENT DATAAgent Distribution Profile, Min/Max Evaluation, HFC-125
3.4
3.5
3.6
3.7
3.8
3.9
4.0
4.1
4.2
31 32 33 34 35 36 37 38 39
Time (s)
Sens
or S
igna
l (VD
C)
min/max signal
CertificationActual
NSa
0230
5
International Aircraft Systems Fire Protection Working GroupSeattle-Tacoma Airport, WA 12-13 March 2002
Federal Aviation AdministrationWJ Hughes Technical Center, Fire Safety Section, AAR-422
Atlantic City Int'l Airport, NJ 08405 USA
PRESENTATION OF RECENT DATAComparing Distribution Profiles, Hal2 RBLT
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
4.0
4.1
4.2
30 31 32 33 34 35 36 37 38 39 40
Time (s)
Sens
or S
igna
l (VD
C)
02227_15, min/max 02227_16, min/max 02228_11, min/max 02305_11, min/max 02306_11, min/max
pr02
3C.x
ls
International Aircraft Systems Fire Protection Working GroupSeattle-Tacoma Airport, WA 12-13 March 2002
Federal Aviation AdministrationWJ 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°FProcess refined
Testing continuing now (12-15March02)Will find acceptable distribution profiles for two air flow conditionsAir flow conditions => high flow/low temperature & low flow/high temperature
Closure analysis will include :Distribution profile measurements at agent storage conditions during fire testingDistribution profile measurements for agent storage conditions at depressed temperature
International Aircraft Systems Fire Protection Working GroupSeattle-Tacoma Airport, WA 12-13 March 2002
Federal Aviation AdministrationWJ 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
International Aircraft Systems Fire Protection Working GroupSeattle-Tacoma Airport, WA 12-13 March 2002
Federal Aviation AdministrationWJ Hughes Technical Center, Fire Safety Section, AAR-422
Atlantic City Int'l Airport, NJ 08405 USA