PERFORMANCE
AIRPLANE
FLIGHT
MANUAL
ALIGNMENT ALLOWANCE
It is the runway length distance that is lost when the airplane
maneuvers into the runway prior t
o
takeoff. There are two alignm
ents
dist
an
ce
s:
−
ASDA Alignment: is the
distan
ce from
the airplane nose landing
gear to the start of the runway surface. This allowance is
subtracted
from the accelerate-stop distance available.
− TODA Alignment: is the distance from the airplane main landing
gear to the start of the runway surface. This allowance is
subtracted
from the takeoff run available (TORA) and from the
takeoff distance available (TODA).
LANDING DISTANCE - LD
It is the distance necessary to land from a screen height of 50 ft above
the landing surface and come to a complete stop.
The landing distance provided by CAF
M for dry runway condition is
the unfactored landing distance multiplie
d by a factor of 1.67.
The landing distance provided by CAFM for wet runway condition is
the factored dry landing distance multiplied by a factor of 1.15.
TAKEOFF AND LANDING RUNWAY CONDITIONS
DRY RUNWAY
A runway is considered dry when it is cle
a
r
of contami
nants an
d visi
ble
moistu
re withi
n the requi
re
d length an
d width being used.
GROOVED OR POROUS RUNWAY SURFACES
Both are intended to improve airplane performance in wet runways by
enhancing drainage capability. In grooved surfa
ces this is achieved
through a specially prepared pavement with transverse wire comb
texturing when the surface is in the plastic stage or with closely
spaced transverse grooves. For porous surface drainage capability is
enhanced by the use of voids on a specially treated wearing course
(porous friction course).
WET RUNWAY
A runway is considered wet when it is neither dry nor contaminated.
5-01 ANAC APPROVED
Page 6 code 01
REVISION 11
AFM-1912
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