UFC 3-260-03
15 Apr 01
d. One objective of the evaluation is to assess capability of the pavement to carry out its mission for
the next 10 years. If the pavement is not up to par, only part of the 10-year mission will be completed. For
pavement purposes, this mission consists of three components: aircraft weights to be supported, aircraft
passes, and desired pavement life. Hence the reduction in mission can be accomplished in three ways:
by reducing the aircraft weights (and keeping passes and expected life constant), by reducing the aircraft
passes (and keeping the other two constant), or by realizing that at the current weight and passes the
expected life will be shorter. The Navy decided that this last option was most adequate since it would not
restrict day-to-day operations, hence results are typically shown in terms of pavement life expectancy, and
urgency of repair for each inadequate feature. This information can be conveyed simply via a color
structural condition map.
e. The airfield life pavement expectancy can be reported in form of a four-color structural condition
map, where the colors represent:
B (BLUE)
- Expected pavement life greater than 10 years
G (GREEN)
- Expected pavement life less than 10 years
Y (YELLOW)
- Pavement in need of structural repair/upgrade
R (RED)
- Very weak or failed pavement, no aircraft recommended
Alternatively the colors can be interpreted as indicating the weight restrictions necessary (at the original
level of passes) to ensure that the feature will last the projected 10 years:
B (BLUE)
- No weight restriction
G (GREEN) - To be used only by half-loaded aircraft
Y (YELLOW) - To be used only by half-loaded aircraft
R (RED) - Not recommended for aircraft traffic until upgrade.
Alternatively the colors could be interpreted as indicating the pass level restrictions (at the original weight)
necessary to ensure that the feature will last the projected 10 years. Note that increases in pass levels up
to 50 percent could typically be accommodated by blue areas without significantly affecting the pavement
life.
f. The color structural condition map is found as follows. First, the PCN of the design critical
aircraft is found. This PCN is then compared to the ACN values in Table 2-5. For the design critical
aircraft, and the given pavement and subgrade type, the PCN can be compared to three ACN values
corresponding to a loaded, half-loaded, and unloaded aircraft. Colors are determined from the
comparison:
If ACNfully loaded # PCN
the color is blue
If ACNhalf-loaded # PCN # ACNfully loaded
the color is green
If ACNempty # PCN # ACNhalf-loaded
the color is yellow
PCN # ACNempty
If
the color is red
g. It should be noted that any airfield pavement evaluation can be viewed as a life expectancy
prediction. As such, it will depend on both the current pavement status, and the projected traffic. If the
actual traffic later varies significantly from the projected traffic, a new evaluation will be necessary. Within
blue areas, small traffic increases are acceptable.
11. SUMMARY OF ARMY EVALUATION REQUIREMENTS. The required elements of an Army evalu-
ation are as follows:
a. Conduct a condition survey and assign PCI values to each feature.
2-10
Previous Page
