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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) gust conditions to CS 25.345(c), 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) is to be considered as a balanced condition. (See CS 25.331(b) for definition.)