Practice Exercise Answers
PRACTICE EXERCISE ANSWERS
Lesson 2
Learning Event
1.
b
1
2.
d
1
3.
b
1
4.
c
2
5.
a
2 (appendix table 13-10)
6.
Solution:
Step 1 - Check the materials.
(1) The base material has a CBR of 80 (Table 4).
(2) The borrow material meets the CBR 50 criteria of
Table 12 for all values. The design CBR = 47.
(3) The select materials meets the criteria also. The design
CBR = 8.
Step 2 - Determine aircraft characteristics (Table 13-10).
For a C-130E
Design gear load
-
83.8 kips
Design curve
-
D-29
Pavement
-
2-1/2" asphalt concrete
Base
-
6" minimum
Step 3 - Determine the cover requirements (Fig. D-29).
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