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Arrival traffic is ignored and only the departure is counted
One plane will load the pavement ~ 1 time (P/TC = 1)
Departures are converted to coverages by the Pass-tocoverage
ratio (P/C)/(P/TC) or (P/C)/1
44
Transportation Systems Workshop
April 23, 2008
Federal Aviation
Administration
44
ACN-PCN - Coverages
If the airplane is not refueled
Arrival weight ~= departure weight
One plane will load the pavement ~ 2 times (P/TC = 2)
Annual Departures are converted to coverages by the Pass-tocoverage
ratio (P/C)/(P/TC) or (P/C)/2
45
Transportation Systems Workshop
April 23, 2008
Federal Aviation
Administration
45
ACN-PCN - Coverages
Center entrance/exit - Airplane is refueled
Arrival weight < departure weight
Arrival is ignored
One plane will load the pavement ~ 2 times (P/TC = 2)
Annual Departures are converted to coverages by the Pass-tocoverage
ratio (P/C)/(P/TC) or (P/C)/2
46
Transportation Systems Workshop
April 23, 2008
Federal Aviation
Administration
46
ACN-PCN - Coverages
Center entrance/exit - Airplane is not refueled
Arrival weight ~= departure weight
One plane will load the pavement ~ 3 times (P/TC = 3)
Annual Departures are converted to coverages by the Pass-tocoverage
ratio (P/C)/(P/TC) or (P/C)/3
See AC 150/5335-5A for further details
47
Transportation Systems Workshop
April 23, 2008
Federal Aviation
Administration
47
ACN-PCN - Coverages
Design example
Annual Departures are converted to coverages by the Pass-tocoverage
ratio (P/C)/1
Total coverages = {Ann. Departures/(P/C)/1} x 20 years
48
Transportation Systems Workshop
April 23, 2008
Federal Aviation
Administration
48
ACN-PCN System
For a technical evaluation, a most demanding or “critical”
airplane must be determined
Using the current procedure identified in AC 150/5335-5A the
airplane which requires the thickest pavement based on its
own demand is considered the critical airplane
49
Transportation Systems Workshop
April 23, 2008
Federal Aviation
Administration
49
ACN-PCN – Technical Evaluation
Determine total thickness requirements for each Airplane in
the traffic mixture
Airplane
Operating
Weight, (lbs)
Tire Pressure
(psi)
Annual
Departures
Flexible
P/C
400 2.92
3.79
3.18
1.73
1.80
1.68
1.75
1.42
6,000
1,200
3,000
2,000
800
1,500
300
148
195
196
200
190
194
217
215
20 year Total
Coverages
B727-200 185,000 2,740
B737-300 130,000 31,662
A319-100 145,000 7,547
B747-400 820,000 34,682
B767-300ER 370,000 22,222
DC8-63 330,000 9,524
A300-B4 370,000 17,143
B777-200 600,000 4,225
50
Transportation Systems Workshop
April 23, 2008
Federal Aviation
Administration
50
ACN-PCN – Technical Evaluation
Determine total thickness requirements for each airplane
For example:
B747-400
3,000 Annual Departures
820,000 lbs Max gross operating weight
Subgrade CBR = 9.0
USE THE COMFAA PROGRAM
51
Transportation Systems Workshop
April 23, 2008
Federal Aviation
Administration
51
ACN-PCN – Technical Evaluation
Start the COMFAA
program
Begin by switching
to “Pavement
Thickness” mode
52
Transportation Systems Workshop
April 23, 2008
Federal Aviation
Administration
52
ACN-PCN – Technical Evaluation
Select “Boeing”
from the Aircraft
groups
Select the
B747-400
53
Transportation Systems Workshop
April 23, 2008
Federal Aviation
Administration
53
ACN-PCN – Technical Evaluation
Click on “CBR” to
enter the subgrade
CBR value
54
Transportation Systems Workshop
April 23, 2008
Federal Aviation
Administration
54
ACN-PCN – Technical Evaluation
Enter subgrade
CBR value
Click “OK”
55
Transportation Systems Workshop
April 23, 2008
Federal Aviation
Administration
55
ACN-PCN – Technical Evaluation
Adjust the airplane
weight to the
known/permitted
operating weight
Start by clicking on
the box containing
gross weight
56
　
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