R.G.W. Cherry & Associates Limited Slide 1 International Aircraft Fire and Cabin Safety Research Conference International Aircraft Fire and Cabin International Aircraft Fire and Cabin Safety Research Conference Safety Research Conference – Lisbon – Lisbon November 2004 November 2004 Reduction in Rate of Fire Reduction in Rate of Fire Caused Accidents and Deaths Caused Accidents and Deaths
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R.G.W. Cherry & Associates Limited International Aircraft Fire and Cabin Safety Research Conference Slide 1 International Aircraft Fire and Cabin Safety.
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R.G.W. Cherry & Associates Limited Slide 1International Aircraft Fire and Cabin Safety Research Conference
International Aircraft Fire and Cabin Safety International Aircraft Fire and Cabin Safety Research Conference Research Conference – Lisbon November 2004– Lisbon November 2004
Reduction in Rate of Fire Reduction in Rate of Fire Caused Accidents and DeathsCaused Accidents and Deaths
R.G.W. Cherry & Associates Limited Slide 2International Aircraft Fire and Cabin Safety Research Conference
Reduction in Rate of Fire Caused Reduction in Rate of Fire Caused Accidents and DeathsAccidents and Deaths
The Research Study was commissioned by The Research Study was commissioned by Transport Canada. Transport Canada.
Its objective was to determine any trends that Its objective was to determine any trends that might exist in occupant survival in passenger might exist in occupant survival in passenger aircraft accidents. aircraft accidents.
Over the past thirty years improvements have Over the past thirty years improvements have been made to many occupant survival factors, been made to many occupant survival factors, however little is known as to the real effect that however little is known as to the real effect that these improvements have made to the these improvements have made to the survivability of occupants. survivability of occupants.
R.G.W. Cherry & Associates Limited Slide 3International Aircraft Fire and Cabin Safety Research Conference
Reduction in Rate of Fire Caused Reduction in Rate of Fire Caused Accidents and DeathsAccidents and Deaths
i)i) An assessment of the trend in the Total Fatal An assessment of the trend in the Total Fatal Accident Rate.Accident Rate.
ii)ii) An assessment of the trend based on those fatal An assessment of the trend based on those fatal accidents that have been caused by aircraft fires. accidents that have been caused by aircraft fires.
iii)iii) An assessment of the trend in the proportion of An assessment of the trend in the proportion of fire fatalities occurring in aircraft accidents as a fire fatalities occurring in aircraft accidents as a function of total number of occupant fatalities.function of total number of occupant fatalities.
Three separate studies were carried out on Three separate studies were carried out on western world turbojet aircraft as follows:western world turbojet aircraft as follows:
R.G.W. Cherry & Associates Limited Slide 4International Aircraft Fire and Cabin Safety Research Conference
Reduction in Rate of Fire Caused Reduction in Rate of Fire Caused Accidents and DeathsAccidents and Deaths
i)i) The accident occurred to a Western World The accident occurred to a Western World Turbojet aircraft Turbojet aircraft
ii)ii) The accident resulted in at least one The accident resulted in at least one fatalityfatality
iii)iii) The aircraft was operating in the The aircraft was operating in the Passenger or Passenger/Cargo role with Passenger or Passenger/Cargo role with passengers on-boardpassengers on-board
Accidents were studied that satisfied the Accidents were studied that satisfied the following criteria:following criteria:
R.G.W. Cherry & Associates Limited Slide 5International Aircraft Fire and Cabin Safety Research Conference
Trend in the Total Fatal Trend in the Total Fatal Accident RateAccident Rate
So what is the trend in So what is the trend in total accident rate?total accident rate?
R.G.W. Cherry & Associates Limited Slide 6International Aircraft Fire and Cabin Safety Research Conference
Trend in the Total Fatal Trend in the Total Fatal Accident RateAccident Rate
DateTotal
Landings (x1000)
Cumulative landings (x1000)
ACCIDENTSCUMULATIVE ACCIDENTS
Cumulative Accidents per
landing
1991 13,079 232,953 8 271 1.16E-06
1992 13,710 246,663 8 279 1.13E-06
1993 14,268 260,931 11 290 1.11E-06
1994 15,097 276,028 10 300 1.09E-06
1995 15,852 291,880 6 306 1.05E-06
1996 16,642 308,522 12 318 1.03E-06
1997 17,372 325,894 10 328 1.01E-06
1998 17,992 343,886 9 337 9.80E-07
1999 18,953 362,839 9 346 9.54E-07
2000 20,501 383,340 10 356 9.29E-07
R.G.W. Cherry & Associates Limited Slide 7International Aircraft Fire and Cabin Safety Research Conference
R.G.W. Cherry & Associates Limited Slide 15International Aircraft Fire and Cabin Safety Research Conference
Trends In Fire FatalitiesTrends In Fire Fatalities
An assessment of the proportion of An assessment of the proportion of fatalities attributable to fire in accidents fatalities attributable to fire in accidents to western built aircraft over the period to western built aircraft over the period
1967 to 2000 inclusive1967 to 2000 inclusive
R.G.W. Cherry & Associates Limited Slide 16International Aircraft Fire and Cabin Safety Research Conference
Trends In Fire FatalitiesTrends In Fire Fatalities•131 Accidents were studied and an 131 Accidents were studied and an assessment made of the number of assessment made of the number of fatalities attributable to fire. fatalities attributable to fire. • Where a precise determination could Where a precise determination could not be made of the number of fatalities not be made of the number of fatalities attributable to the fire the maximum attributable to the fire the maximum and minimum number possible was and minimum number possible was recorded. recorded.
R.G.W. Cherry & Associates Limited Slide 17International Aircraft Fire and Cabin Safety Research Conference
Trends In Fire FatalitiesTrends In Fire Fatalities
Cumulative Fatlities Fatlities Proportion of Fire Fatlities
Date Aircraft Type TotalFire
Maximum
Sample DataSample Data
R.G.W. Cherry & Associates Limited Slide 18International Aircraft Fire and Cabin Safety Research Conference
Trends In Fire FatalitiesTrends In Fire Fatalities
y = -0.0000134x + 0.6804081
0.000.100.200.30
0.400.50
0.600.700.800.90
1.00
0 1000 2000 3000 4000 5000 6000 7000Cumulative Number of Fatalities
0923/Master Spreadsheet Feasibility Study/All Data
Pro
port
ion
of F
atal
ities
at
trib
utab
le to
Fir
e Maximum
Minimum
Average
y = -0.0000134x + 0.6804081
0.000.100.200.30
0.400.50
0.600.700.800.90
1.00
0 1000 2000 3000 4000 5000 6000 7000Cumulative Number of Fatalities
0923/Master Spreadsheet Feasibility Study/All Data
Pro
port
ion
of F
atal
ities
at
trib
utab
le to
Fir
e
y = -0.0000134x + 0.6804081
0.000.100.200.30
0.400.50
0.600.700.800.90
1.00
0 1000 2000 3000 4000 5000 6000 7000Cumulative Number of Fatalities
0923/Master Spreadsheet Feasibility Study/All Data
Pro
port
ion
of F
atal
ities
at
trib
utab
le to
Fir
e Maximum
Minimum
Average
Maximum
Minimum
Average
R.G.W. Cherry & Associates Limited Slide 19International Aircraft Fire and Cabin Safety Research Conference
y = -0.0000357x + 0.8151364
0.000.100.200.300.400.500.600.700.800.901.00
0 1000 2000 3000 4000 5000 6000
Cumulative Number of Fatalities 0923/Master Spreadsheet Feasibility Study/All Data with Info Death
Pro
po
rtio
n o
f F
atal
itie
s at
trib
uta
ble
to
F
ire
y = -0.0000357x + 0.8151364
0.000.100.200.300.400.500.600.700.800.901.00
0 1000 2000 3000 4000 5000 6000
Cumulative Number of Fatalities 0923/Master Spreadsheet Feasibility Study/All Data with Info Death
Pro
po
rtio
n o
f F
atal
itie
s at
trib
uta
ble
to
F
ire
Trends In Fire FatalitiesTrends In Fire Fatalities
R.G.W. Cherry & Associates Limited Slide 20International Aircraft Fire and Cabin Safety Research Conference
ConclusionsConclusions
The Duane Growth Model seems to The Duane Growth Model seems to represent the improvement in fatal represent the improvement in fatal accident rate to western world turbojets accident rate to western world turbojets for All fatal accidents & Fatal accidents for All fatal accidents & Fatal accidents attributable to fireattributable to fire
R.G.W. Cherry & Associates Limited Slide 21International Aircraft Fire and Cabin Safety Research Conference
ConclusionsConclusions
There appears to be a continuous There appears to be a continuous downward trend in the total Fatal downward trend in the total Fatal Accident Rate and the accident rate Accident Rate and the accident rate attributable to fire, for western built attributable to fire, for western built turbojet aircraft, over the period 1967 to turbojet aircraft, over the period 1967 to 2000.2000.
R.G.W. Cherry & Associates Limited Slide 22International Aircraft Fire and Cabin Safety Research Conference
ConclusionsConclusions
• The proportion of fatalities The proportion of fatalities attributable to fire appears to attributable to fire appears to demonstrate a continuous downward demonstrate a continuous downward trend over the period 1967 to 2000.trend over the period 1967 to 2000.
• However, further data are required to However, further data are required to confirm this conclusion.confirm this conclusion.