Control Surface Inertial Loads
Control Surface Inertial Loads
(OP)
FAR 25.393 specifies that "Control surfaces and supporting hinge brackets must be designed for inertia loads acting parallel to the hinge line." A load of 12G (18G Ultimate) is given for horizontal surfaces.
I'm trying to determine if this requirement should be applied to the wing flaps. Is the wing flap considered a control surface?
Personally I think that the control surfaces would include the elevator, ailerons, and rudder however some colleagues disagree. If you believe that this requirement should be applied to the flap, is there any reason it shouldn't also be applied to the leading edge slats?
Perhaps the reasoning behind this requirement would help determine if it should apply.
I'm trying to determine if this requirement should be applied to the wing flaps. Is the wing flap considered a control surface?
Personally I think that the control surfaces would include the elevator, ailerons, and rudder however some colleagues disagree. If you believe that this requirement should be applied to the flap, is there any reason it shouldn't also be applied to the leading edge slats?
Perhaps the reasoning behind this requirement would help determine if it should apply.
RE: Control Surface Inertial Loads
see page 3 and 4: https://www.princeton.edu/~stengel/MAE331Lecture10...
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RE: Control Surface Inertial Loads
I thought I'd seen a spanwise load, I thought it was 100g; could've been an OEM's private case, could be I'm mis-remembering ...
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RE: Control Surface Inertial Loads
RE: Control Surface Inertial Loads
a flap can have a hinge line (very old designs) but most translate significantly (so not much of a hinge line).
i think the FAA thinks that different surfaces do different things. Ailerons and such are different to flaps. The consequences of failure are different too. And I guess over the years different things have happened (creating different rules).
another day in paradise, or is paradise one day closer ?
RE: Control Surface Inertial Loads
RE: Control Surface Inertial Loads
FAR 23.657 at the time.
Tim