FAA Federal Aviation Regulations (FARS, 14 CFR)

If speed control devices (such as spoilers and drag flaps) are incorporated for use in enroute conditions --

(a) The airplane must be designed for the symmetrical maneuvers and gusts prescribed in §§23.333, 23.337, and 23.341, and the yawing maneuvers and lateral gusts in §§23.441 and 23.443, with the device extended at speeds up to the placard device extended speed; and

(b) If the device has automatic operating or load limiting features, the airplane must be designed for the maneuver and gust conditions prescribed in paragraph (a) of this section at the speeds and corresponding device positions that the mechanism allows.

[Amdt. 23-7, 34 FR 13089, Aug. 13, 1969]