458
14 CFR Ch. I (1–1–19 Edition)
Pt. 25, App. N
curve, given by the 50 percent value and a
±
1-
standard deviation, as shown in Table 1 of
this appendix.
(ii) The flammability envelope of the fuel
that must be used for the flammability expo-
sure analysis is a function of the flash point
of the fuel selected by the Monte Carlo for a
given flight. The flammability envelope for
the fuel is defined by the upper flammability
limit (UFL) and lower flammability limit
(LFL) as follows:
(A) LFL at sea level = flash point tempera-
ture of the fuel at sea level minus 10
°
F. LFL
decreases from sea level value with increas-
ing altitude at a rate of 1
°
F per 808 feet.
(B) UFL at sea level = flash point tempera-
ture of the fuel at sea level plus 63.5
°
F. UFL
decreases from the sea level value with in-
creasing altitude at a rate of 1
°
F per 512
feet.
(4) For each flight analyzed, a separate
random number must be generated for each
of the three parameters (ground ambient
temperature, cruise ambient temperature,
and fuel flash point) using the Gaussian dis-
tribution defined in Table 1 of this appendix.
T
ABLE
1.—G
AUSSIAN
D
ISTRIBUTION FOR
G
ROUND
A
MBIENT
T
EMPERATURE
, C
RUISE
A
MBIENT
T
EMPERATURE
,
AND
F
UEL
F
LASH
P
OINT
Parameter
Temperature in deg F
Ground ambient
temperature
Cruise ambient
temperature
Fuel flash point
(FP)
Mean Temp ...........................................................................................
59.95
¥
70 120
Neg 1 std dev ........................................................................................
20.14
8
8
Pos 1 std dev ........................................................................................
17.28
8
8
(b) The Flight Length Distribution defined
in Table 2 must be used in the Monte Carlo
analysis.
T
ABLE
2.—F
LIGHT
L
ENGTH
D
ISTRIBUTION
Flight length (NM)
Airplane maximum range—nautical miles (NM)
From To 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
Distribution of flight lengths (percentage of total)
0 200
11.7 7.5 6.2 5.5 4.7 4.0 3.4 3.0 2.6 2.3
200 400 27.3 19.9 17.0 15.2 13.2 11.4 9.7 8.5 7.5 6.7
400 600 46.3 40.0 35.7 32.6 28.5 24.9 21.2 18.7 16.4 14.8
600 800
10.3
11.6
11.0
10.2 9.1 8.0 6.9 6.1 5.4 4.8
800
1000 4.4 8.5 8.6 8.2 7.4 6.6 5.7 5.0 4.5 4.0
1000
1200 0.0 4.8 5.3 5.3 4.8 4.3 3.8 3.3 3.0 2.7
1200
1400 0.0 3.6 4.4 4.5 4.2 3.8 3.3 3.0 2.7 2.4
1400
1600 0.0 2.2 3.3 3.5 3.3 3.1 2.7 2.4 2.2 2.0
1600
1800 0.0 1.2 2.3 2.6 2.5 2.4 2.1 1.9 1.7 1.6
1800
2000 0.0 0.7 2.2 2.6 2.6 2.5 2.2 2.0 1.8 1.7
2000
2200 0.0 0.0 1.6 2.1 2.2 2.1 1.9 1.7 1.6 1.4
2200
2400 0.0 0.0 1.1 1.6 1.7 1.7 1.6 1.4 1.3 1.2
2400
2600 0.0 0.0 0.7 1.2 1.4 1.4 1.3 1.2 1.1 1.0
2600
2800 0.0 0.0 0.4 0.9 1.0 1.1 1.0 0.9 0.9 0.8
2800
3000 0.0 0.0 0.2 0.6 0.7 0.8 0.7 0.7 0.6 0.6
3000
3200 0.0 0.0 0.0 0.6 0.8 0.8 0.8 0.8 0.7 0.7
3200
3400 0.0 0.0 0.0 0.7 1.1 1.2 1.2 1.1 1.1 1.0
3400
3600 0.0 0.0 0.0 0.7 1.3 1.6 1.6 1.5 1.5 1.4
3600
3800 0.0 0.0 0.0 0.9 2.2 2.7 2.8 2.7 2.6 2.5
3800
4000 0.0 0.0 0.0 0.5 2.0 2.6 2.8 2.8 2.7 2.6
4000
4200 0.0 0.0 0.0 0.0 2.1 3.0 3.2 3.3 3.2 3.1
4200
4400 0.0 0.0 0.0 0.0 1.4 2.2 2.5 2.6 2.6 2.5
4400
4600 0.0 0.0 0.0 0.0 1.0 2.0 2.3 2.5 2.5 2.4
4600
4800 0.0 0.0 0.0 0.0 0.6 1.5 1.8 2.0 2.0 2.0
4800
5000 0.0 0.0 0.0 0.0 0.2 1.0 1.4 1.5 1.6 1.5
5000
5200 0.0 0.0 0.0 0.0 0.0 0.8 1.1 1.3 1.3 1.3
5200
5400 0.0 0.0 0.0 0.0 0.0 0.8 1.2 1.5 1.6 1.6
5400
5600 0.0 0.0 0.0 0.0 0.0 0.9 1.7 2.1 2.2 2.3
5600
5800 0.0 0.0 0.0 0.0 0.0 0.6 1.6 2.2 2.4 2.5
5800
6000 0.0 0.0 0.0 0.0 0.0 0.2 1.8 2.4 2.8 2.9
6000
6200 0.0 0.0 0.0 0.0 0.0 0.0 1.7 2.6 3.1 3.3
6200
6400 0.0 0.0 0.0 0.0 0.0 0.0 1.4 2.4 2.9 3.1
6400
6600 0.0 0.0 0.0 0.0 0.0 0.0 0.9 1.8 2.2 2.5
6600
6800 0.0 0.0 0.0 0.0 0.0 0.0 0.5 1.2 1.6 1.9
6800
7000 0.0 0.0 0.0 0.0 0.0 0.0 0.2 0.8 1.1 1.3
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