Lesson 2/Learning Event 2
Problem #1: T/O Airfield Design
Design a support area, fully operational, tactical airfield capable of handling F4C traffic. Design the
Type C traffic area only. The following materials are available:
Surface:
Asphalt concrete pavement
Surface treatment
Base:
Sand shell
Subbase: Borrow material, GP, maximum size = 11/2", CBR = 0,
40% passes the #10 sieve, 4% passes the #200 sieve, LL = 20,
PI = 4.
Select:
None
Subgrade: ML, PI = 5, CBR = 4.
Solution:
Step 1  Check the materials.
(1) The base material has a CBR of 80 (Table 72).
(2) The borrow material meets the criteria for a CBR 50 (Table 12)
Step 2  Determine the aircraft characteristics (Table 1310).
For an F4C:
Design gear load

26.0 kips
Design curve

D27
Pavement

31/2"
Base

6" minimum
Step 3  Determine the cover requirements (Fig. D27).
Step 4  Determine the thickness design.
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