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AMC 25.345(c) High lift devices (Procedure flight condition)

Available versions for ERULES-1963177438-8381

ED Decision 2003/2/RM found in: CS-25 Amdt 27 - Large Aeroplanes (Jan 2023)

Version Text

AMC 25.345(c) High lift devices (Procedure flight condition)

ED Decision 2003/2/RM

1 En-route conditions are flight segments other than take-off, approach and landing. As applied to the use of high lift devices the following flight phases are to be included in en-route conditions:

— holding in designated areas outside the terminal area of the airport, and

— flight with flaps extended from top of descent.

The following flight phases are not to be included in en-route conditions:

— portion of the flight corresponding to standard arrival routes preceding the interception of the final approach path, and

— holding at relatively low altitude close to the airport.

2 To apply [CS 25.341(a)](#_DxCrossRefBm1709820927) gust conditions to [CS 25.345(c)](#_DxCrossRefBm1709820949), the speeds VFC and VFD should be determined for the flap positions selected in en-route conditions.

These procedures should ensure proper speed margins for flap retraction in the case of severe turbulence when the aeroplane is in a low speed en-route holding configuration.

3 The manoeuvre of [CS 25.345(c)(1)](#_DxCrossRefBm1709820949) is to be considered as a balanced condition. (See [CS 25.331(b)](#_DxCrossRefBm1709820915) for definition.)