PERFORMANCE
AIRPLANE
FLIGHT
MANUAL
5-01 ANAC APPROVED
Page 6 code 01 REVISION 13
AFM-1385
ALIGNMENT ALLOWANCE
It is the runway length distance that is lost when the airplane
maneuvers into the runway prior to takeoff. There are two alignments
distances:
− ASDA Alignment: is the distance 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 CAFM for dry runway condition is the
unfactored landing distance multiplied 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 clear of contaminants and visible
moisture within the required length and width being used.
GROOVED OR POROUS RUNWAY SURFACES
Both are intended to improve airplane performance in wet runways by
enhancing drainage capability. In grooved surfaces 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.
To Next Page
Loading...
