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101-590010-469R3_text.fm Page 13 Tuesday, January 29, 2013 8:56 AM

CONTAMINATED RUNWAY PERFORMANCE

All contaminated runway performance is based on analytical corrections of dry,
hard surface flight test data. The analytical corrections are based on guidance
provided by the Acceptable Means of Compliance (AMC) 25.1591. The contami-
nated runway performance assumes that:
1. The contaminant is spread over the entire runway surface to an even depth
(although rutting, for example, may have taken place).
2. The contaminant is of a uniform specific gravity as listed below.
Contaminant Specific Gravity
Standing Water 1.00
Slush 0.85
Wet Snow 0.50
Dry Snow 0.20
3. Where the contaminant has been sanded, graded (mechanically leveled)
or otherwise treated before use, that it has been done in accordance with
agreed national procedures.
Operation on runways contaminated with standing water, slush, wet snow, dry
snow, compacted snow, or other contaminants implies uncertainties with regard
to runway friction and contaminant drag and therefore to the achievable perfor-
mance and control of the airplane during takeoff, since the actual conditions may
not completely match the assumptions on which the performance is based.
Where possible, every effort should be made to ensure that the runway surface is
cleared of any significant contamination.
The provision of performance information for contaminated runways should not
be taken as implying that ground handling characteristics on these surfaces will
be as good as can be achieved on dry or wet runways, in particular following
engine failure, operating in crosswinds or when using reverse thrust. See Section
4, Normal Procedures in this Supplement.
Tests on contaminated runways have not identified clear, consistent trends with
respect to the effect of ambient temperature on braking action for a specific run-
way contaminant. The case where the surface temperature is just at the melting
point (i.e., about 0°C) may be an exception as a water film may form by surface
melting and result in reduced friction and consequently braking performance. The
guidance provided in this supplement does not address surfaces comprised of
multiple contaminant types such as loose snow, slush or standing water covering
compacted snow or any other cases where multiple contaminant types are pres-
ent.
Contaminated takeoff distance data contained within this supplement are not
applicable to airplanes with STC SA02131SE installed. Landing distance in the
referenced table remains unchanged and is applicable.

Approved Performance Data
Revised: January, 2013
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