Pt. 25, App. N

14 CFR Ch. I (1-1-19 Edition)

curve, given by the 50 percent value and a Section1standard deviation, as shown in Table 1 of
this appendix.
(ii) The flammability envelope of the fuel
that must be used for the flammability exposure 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 temperature of the fuel at sea level minus 10 SectionF. LFL

decreases from sea level value with increasing altitude at a rate of 1 SectionF per 808 feet.
(B) UFL at sea level = flash point temperature of the fuel at sea level plus 63.5 SectionF. UFL
decreases from the sea level value with increasing altitude at a rate of 1 SectionF 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 distribution defined in Table 1 of this appendix.

TABLE 1. - GAUSSIAN DISTRIBUTION FOR GROUND AMBIENT TEMPERATURE, CRUISE AMBIENT
TEMPERATURE, AND FUEL FLASH POINT
Temperature in deg F
Parameter

Ground ambient
temperature

Mean Temp ...........................................................................................
Neg 1 std dev ........................................................................................
Pos 1 std dev ........................................................................................

Cruise ambient
temperature

59.95
20.14
17.28

Fuel flash point
(FP)
120
8
8

Section70
8
8

(b) The Flight Length Distribution defined
in Table 2 must be used in the Monte Carlo
analysis.

TABLE 2. - FLIGHT LENGTH DISTRIBUTION
Flight length (NM)
From

To

Airplane maximum range - nautical miles (NM)
1000

2000

3000

4000

5000

6000

7000

8000

9000

10000

spaschal on DSK3GDR082PROD with CFR

Distribution of flight lengths (percentage of total)
0
200
400
600
800
1000
1200
1400
1600
1800
2000
2200
2400
2600
2800
3000
3200
3400
3600
3800
4000
4200
4400
4600
4800
5000
5200
5400
5600
5800
6000
6200
6400
6600
6800

200
400
600
800
1000
1200
1400
1600
1800
2000
2200
2400
2600
2800
3000
3200
3400
3600
3800
4000
4200
4400
4600
4800
5000
5200
5400
5600
5800
6000
6200
6400
6600
6800
7000

11.7
27.3
46.3
10.3
4.4
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0

7.5
19.9
40.0
11.6
8.5
4.8
3.6
2.2
1.2
0.7
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0

6.2
17.0
35.7
11.0
8.6
5.3
4.4
3.3
2.3
2.2
1.6
1.1
0.7
0.4
0.2
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0

5.5
15.2
32.6
10.2
8.2
5.3
4.5
3.5
2.6
2.6
2.1
1.6
1.2
0.9
0.6
0.6
0.7
0.7
0.9
0.5
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0

4.7
13.2
28.5
9.1
7.4
4.8
4.2
3.3
2.5
2.6
2.2
1.7
1.4
1.0
0.7
0.8
1.1
1.3
2.2
2.0
2.1
1.4
1.0
0.6
0.2
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0

4.0
11.4
24.9
8.0
6.6
4.3
3.8
3.1
2.4
2.5
2.1
1.7
1.4
1.1
0.8
0.8
1.2
1.6
2.7
2.6
3.0
2.2
2.0
1.5
1.0
0.8
0.8
0.9
0.6
0.2
0.0
0.0
0.0
0.0
0.0

3.4
9.7
21.2
6.9
5.7
3.8
3.3
2.7
2.1
2.2
1.9
1.6
1.3
1.0
0.7
0.8
1.2
1.6
2.8
2.8
3.2
2.5
2.3
1.8
1.4
1.1
1.2
1.7
1.6
1.8
1.7
1.4
0.9
0.5
0.2

3.0
8.5
18.7
6.1
5.0
3.3
3.0
2.4
1.9
2.0
1.7
1.4
1.2
0.9
0.7
0.8
1.1
1.5
2.7
2.8
3.3
2.6
2.5
2.0
1.5
1.3
1.5
2.1
2.2
2.4
2.6
2.4
1.8
1.2
0.8

2.6
7.5
16.4
5.4
4.5
3.0
2.7
2.2
1.7
1.8
1.6
1.3
1.1
0.9
0.6
0.7
1.1
1.5
2.6
2.7
3.2
2.6
2.5
2.0
1.6
1.3
1.6
2.2
2.4
2.8
3.1
2.9
2.2
1.6
1.1

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2.3
6.7
14.8
4.8
4.0
2.7
2.4
2.0
1.6
1.7
1.4
1.2
1.0
0.8
0.6
0.7
1.0
1.4
2.5
2.6
3.1
2.5
2.4
2.0
1.5
1.3
1.6
2.3
2.5
2.9
3.3
3.1
2.5
1.9
1.3