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ACN-PCN – Technical Evaluation
Enter Gross
Weight (lbs)
Click “OK”
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ACN-PCN – Technical Evaluation
Click on the
coverages to enter
the desired 20-year
total number of
coverages for this
airplane
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Determine total coverages for the B747
Find P/C ratio from COMFAA (use flexible value = 1.73)
Coverages = annual departures/{(P/C)/(P/TC)} *years in design
Total coverages = 3000 ann. departures/1.73/1}*20 = 34,682
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Enter the desired
coverages and click
OK
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ACN-PCN – Technical Evaluation
OPTIONAL
PROCEDURE
if TC = 1
Click on the annual
departure to enter the
desired annual
departures for this
airplane
Note that this example
uses the Flexible annual
departures
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ACN-PCN – Technical Evaluation
Since our example has
TC=1
Click on annual
departures and
enter the desired
annual departures
for this airplane
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ACN-PCN – Technical Evaluation
Click on “AC
Thickness” to
calculate the flexible
pavement thickness
requirement
Repeat for each
airplane
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airplane Data – required thickness determination
Airplane
Operating
Weight,
(lbs)
Tire
Pressure
(psi)
Annual
Departures
Flexible
**P/C
Required t,
(in.)
B727-200 185,000 148 400 2.92 22.6
B737-300 130,000 195 6,000 3.79 22.7
A319-100 145,000 196 1,200 3.18 20.3
B747-400 820,000 200 3,000 1.73 30.9
B767-300ER 370,000 190 2,000 1.80 27.9
DC8-63 330,000 194 800 1.68 26.6
A300-B4 370,000 205 1,500 1.75 29.1
B777-200 600,000 215 300 1.42 28.0
** P/C ratio provided by COMFAA while in pavement thickness mode
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ACN-PCN – Technical Evaluation
3c) Convert traffic to equivalent traffic of the critical airplane
Two step process
1. Convert departures based on gear type
2. Complete conversion using wheel load ratio equation
I
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ACN-PCN – Technical Evaluation
Gear type to “Critical”
gear type conversion
factors
M=# wheels on critical
airplane gear
N=# wheels on
converted airplane gear
AC 150/5335-5A
paragraph 1.2, App. 1
To Convert From (N) To (M) Multiply Traffic Cycles By
S D 0.80
S 2D 0.51
S 3D 0.33
D S 1.33
D 2D 0.64
D 3D 0.41
2D S 1.95
2D D 1.56
2D 3D 0.64
3D S 3.05
3D D 244
3D 2D 1.56
2D/2D2 D 1.56
2D/2D2 2D 1.00
2D/2D2 3D 0.64
0.8(M−N)
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Sample conversion to B747 gear type
(2D since procedure only uses one gear of the 2D/2D2 configuration)
Airplane Gear Type
Annual Traffic
Cycles (TC)
Conversion
Factor
Equivalent
(2D) TC
727-200 D 400 0.64 256
737-300 D 6,000 0.64 3,840
A319-100 D 1,200 0.64 768
747-400 2D/2D2 3,000 1.0 3,000
767-200ER 2D 2,000 1.0 2,000
DC8-63 2D 800 1.0 800
A300-B4 2D 1,500 1.0 1,500
777-200 3D 300 1.56 468
15,200 12,632
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