AWO.A.ALS.109 CS AWO.A.ALS.109 Automatic landing distance

The landing distance referred to in CS AWO.A.ALS.109 may be derived as follows:

- (a) The configuration procedure and speed should be those recommended for an automatic landing. - (b) The distance from the runway threshold to the touchdown point should be the distance from the runway threshold to the glideslope origin (SO) plus the mean distance from the glideslope origin to touchdown (STD) plus three times the standard deviation of the distance from the glideslope origin to touchdown σ (S TD ). - (c) The gross distance from touchdown to a complete stop should be determined in accordance with CS 25.125, assuming a touchdown speed equal to the main touchdown speed plus three standard deviations of the touchdown speed.

Note: The main values and standard deviations considered in points (b) and (c) should be based on random variations. Systematic variation of parameters should cover the normal range of flight manual conditions.

The landing distance required should be taken as the distance from the runway threshold to the touchdown point, as defined in (b), factored by 1.15 (i.e. 1.15 (SO + STD + 3 σ (S TD )), plus the ground-roll distance defined in (c), multiplied by a factor of 1.15.

- (d) The landing distance required should include corrections for variations in the glideslope angle and variations in the glideslope height at the threshold. Alternatively, these effects may be included by use of conservative assumptions in the basic presentation of data, with the applicable ranges stated in the AFM.

Note: The landing distance as derived in (a) to (d) should be compared with the normal landing distance according to CS 25.125.

[Issue: CS-AWO/2]

the procedures and assigned tasks of the flight crew. The indications shall be grouped in a logical and consistent manner and be visible under all expected normal lighting conditions.

[Issue: CS-AWO/2]