Embraer EMB145 Operation Manual page 685

AIRCRAFT CLASSIFICATION NUMBER - ACN
The Pavement Classification Number (PCN) reported shall indicate
that an airplane with ACN equal to or less than the reported PCN can
operate on that pavement.
PCN - PAVEMENT CLASSIFICATION NUMBER
Example: PCN 50 / F / A / X / T
1 - Type of pavement:
R = Rigid (concrete)
2 - Pavement sub-grade strength category:
A = High, B = Medium, C = Low, D = Ultra-low.
3 - Maximum tire pressure authorized for the pavement:
W = High, no limit;
Y = Low (up to 145 psi);
4 - Pavement evaluation method:
T = Technical evaluation;
U = By experience of airplane actually using the pavement.
OVERLOAD OPERATIONS
Individual airport authorities are free to decide on their own criteria for
permitting overload operations as long as pavements remain safe for
use by airplane. However, a 10% difference in ACN over PCN for
flexible pavement and 5% for rigid pavements is generally accepted,
provided that overload operations do not exceed 5% of the annual
departures and are spread throughout the year.
REVISION 40
AIRPLANE
OPERATIONS
MANUAL
1 2 3 4
F = Flexible (asphalt)
X = Medium (up to 217 psi)
Z = Very low (up to 73 psi)
PERFORMANCE
EMB-145 LB
Page
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Code
02