Embraer EMB145 Operation Manual page 706

PERFORMANCE
EMB-145/135 FAA
CONTAMINATED RUNWAYS
UNFACTORED LANDING DISTANCE - ADVISORY
INFORMATION
A runway is considered to be contaminated when more than 25% of
the runway surface area (whether in isolated areas or not) within the
required length and width being used is covered by the following:
− Surface water more than 3 mm (0.125 in) deep, or by slush, or
dry snow, equivalent to more than 3 mm (0.125 in) of water;
− Snow which has been compressed into a solid mass which
resists further compression and will hold together or break into
lumps if picked up (compacted snow); or
− Ice, including wet ice.
Contaminants can be classified as being: drag producing, for example
by contaminant displacement or impingement; braking friction
reducing; or a combination of both. Runways contaminated with
compacted snow, ice and wet ice are considered slippery, once there
is no impingent drag and the braking friction coefficient reduces. Other
contaminants, such as, standing water, slush or dry snow, combine
both effects.
The contaminated unfactored landing distance is the actual distance to
land the airplane after a stabilized approach, crossing a point at 50 ft
above the runway threshold at V
temperature, using maximum manual braking effort.
The following tables present guidance information for obtaining the
airplane landing distance on contaminated runways. The result is the
worst value between wet and contaminated landing distance.
However, this distance does not consider the 1.15 factor from EU-OPS
1.515 and 1.520. It is the operator's responsibility to evaluate the
application of the factor above.
In order to find the contaminated landing distance, enter the table with
the current contaminant, flaps configuration and actual landing weight
and obtain a reference contaminated unfactored landing distance
(CULD ).
REF
Page
6
1-04-30
AIRPLANE
OPERATIONS
MANUAL
Code
02
Copyright © by Embraer. Refer to cover page for details.
, on a zero slope runway, ISA
REF
REVISION 41