AMC1 CAT.POL.A.305 Take-off

CAA ORS9 Decision No. 15

RUNWAY SURFACE CONDITION

(a)    Unless otherwise specified in the AFM or other performance or operating manuals from the manufacturer, the variables affecting the take-off performance and the associated factors that should be applied to the AFM data are shown in Table 1 below. They should be applied in addition to the operational factors as prescribed in CAT.POL.A.305.

Table 1 Runway surface condition — Variables

Surface type	Condition	Factor
Grass (on firm soil) up to 20 cm long	Dry	1.2
up to 20 cm long	Wet	1.3
Paved	Wet	1.0

(b)    The soil should be considered firm when there are wheel impressions but no rutting.

(c)    When taking off on grass with a single-engined aeroplane, care should be taken to assess the rate of acceleration and consequent distance increase.

(d)    When making a rejected take-off on very short grass that is wet and with a firm subsoil, the surface may be slippery, in which case the distances may increase significantly.

(e)    The determination of take-off performance data for wet and contaminated runways, when such data is available, should be based on the reported runway surface condition in terms of contaminant and depth.