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accordance with the standard procedures associated with the
ACN-PCN method.
Note.- The standard procedures for determining the ACN
of an aircrafi are given in the Aerodrome Design Manual,
Part 3. For convenience several aircrafi types currently in use
have been evaluated on rigid andjlexiblepavements founded on
the four subgrade categories in 2.6.6 b) below and the results
tabulated in that manual.
2.6.5 For the purposes of determining the ACN, the
behaviour of a pavement shall be classified as equivalent to a
rigid or flexible construction.
2.6.6 Information on pavement type for ACN-PCN
determination, subgrade strength category, maximum allowable
tire pressure category and evaluation method shall be reported
using the following codes:
a) Pavement type for ACN-PCN determination:
Rigid pavement
Flexible pavement
Code
Note.- Zfthe actual construction is composite or nonstandard,
include a note to that efect (see example 2
below).
b) Subgrade strength category:
Code
High strength: characterized by K = A
150 MN/m3 and representing all K values
above 120 h4FJ/m3 for rigid pavements, and
by CBR = 15 and representing all CBR
values above 13 for flexible pavements.
Medium strength: characterized by K = B
80 h4FJ/m3 and representing a range in K of
60 to 120 h4FJ/m3 for rigid pavements, and
by CBR = 10 and representing a range in
CBR of 8 to 13 for flexible pavements.
Low strength: characterized by K = C
40 MN/m3 and representing a range in K of
25 to 60 MN/m3 for rigid pavements, and
by CBR = 6 and representing a range in
CBR of 4 to 8 for flexible pavements.
Ultra low strength: characterized by K = D
20 MN/m3 and representing all K values
below 25 MN/m3 for rigid pavements, and
by CBR = 3 and representing all CBR
values below 4 for flexible pavements.
c) Maximum allowable tire pressure category:
Code
High: no pressure limit W
Medium: pressure limited to 1.50 h4Pa X
Low: pressure limited to 1.00 h4Pa Y
Very low: pressure limited to 0.50 h4Pa Z
d) Evaluation method:
Code
Technical evaluation: representing a speci- T
fic study of the pavement characteristics
and application of pavement behaviour
technology.
Using aircrafr experience: representing a U
knowledge of the specific type and mass of
&craft satisfactorily being supported under
regular use.
Annex 14 - Aerodromes Volume I
Note.- The following examples illustrate how pavement
strength data are reported under the ACN-PCN method.
Example 1.- If the bearing strength of a rigid pavement,
resting on a medium strength subgrade, has been assessed by
technical evaluation to be PCN 80 and there is no tire pressure
limitation, them the reported information would be:
Example 2.- If the bearing strength of a composite
pavement, behaving like a flexible pavement and resting on a
high strength subgrade, has beem assessed by using aircraft
experience to be PCN 50 and the maximum tire pressure
allowable is 1.00 MPa, then the reported information.would be:
Not&- Composite construction.
Example 3.- If the bearing strength of a flexible pavement,
resting on a medium strength subgrade, has been assessed by
technical evaluation to be PCN 40 and the maximum allowable
tire pressure is 0.80 MPa, then the reported information would be:
Example 4.- If a pavement is subject to a B747-400 all-up
mass limitation of 390 000 kg, then the reported information
would include the following note.
Note.- The reported PCN is subject to a B747-400 all-up
mass limitation of 390 000 kg.
2.6.7 Recommendation.- Criteria should be established
to regulate the use of a pavement by an aircraft with an ACN
higher than the PCN reported for thatpavement in accordance
with 2.6.2 and 2.6.3.
Note.- Attachment A, Section 19 details a simple method for
regulating overload operations while the Aerodrome Design
Manual, Part 3 includes the descriptions of more detailed
procedures for evaluation ofpavements and their suitability for
restricted overload operations.
2.6.8 The bearing strength of a pavement intended for
aircraft of apron (ramp) mass equal to or less than 5 700 kg shall
be made available by reporting the following information:
a) maximum allowable aircraft mass; and
b) maximum allowable tire pressure.
Example: 4 000 kgt0.50 MPa.
2.7 Pre-flight altimeter
check location
2.7.1 One or more pre-flight altimeter check locations
shall be established for an aerodrome.
2.7.2 Recommendation.- A pre-flight check location
should be located on an apron.
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