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e-CFR data is current as of September 24, 2020

Title 14Chapter ISubchapter CPart 25Subpart D → §25.779


Title 14: Aeronautics and Space
PART 25—AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY AIRPLANES
Subpart D—Design and Construction


§25.779   Motion and effect of cockpit controls.

Cockpit controls must be designed so that they operate in accordance with the following movement and actuation:

(a) Aerodynamic controls:

(1) Primary.

ControlsMotion and effect
AileronRight (clockwise) for right wing down.
ElevatorRearward for nose up.
RudderRight pedal forward for nose right.

(2) Secondary.

ControlsMotion and effect
Flaps (or auxiliary lift devices)Forward for flaps up; rearward for flaps down.
Trim tabs (or equivalent)Rotate to produce similar rotation of the airplane about an axis parallel to the axis of the control.

(b) Powerplant and auxiliary controls:

(1) Powerplant.

ControlsMotion and effect
Power or thrustForward to increase forward thrust and rearward to increase rearward thrust.
PropellersForward to increase rpm.
MixtureForward or upward for rich.
Carburetor air heatForward or upward for cold.
SuperchargerForward or upward for low blower. For turbosuperchargers, forward, upward, or clockwise, to increase pressure.

(2) Auxiliary.

ControlsMotion and effect
Landing gearDown to extend.

[Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as amended by Amdt. 25-72, 55 FR 29778, July 20, 1990]

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