Originally Posted by
john_tullamarine
FAR 25.149(e) suggests a max rudder load of 150lb for the current standard. This had been the case for many years. I'll leave it for you to track down but an earlier standard used 180lb for max rudder load.
Voila!.....
Originally Posted by Sec. 25.149 - 1965 original text
(d) The rudder forces required to maintain control at VMC may not exceed 180 pounds nor may it be necessary to reduce power or thrust of the operative engines.
Originally Posted by Sec. 25.149 - Amdt. 25-42, Eff. 3/1/78
(d) The rudder forces required to maintain control at VMC may not exceed [150] pounds nor may it be necessary to reduce power or thrust of the operative engines. ....
The rationale may be found in ...
Originally Posted by Notice of Airworthiness Review Program No. 6; Notice No. 75-25; Issued on 05/29/75.
The proposal for Sec. 25.149(d) would reduce the maximum permissible rudder force used in determining VMC, from 180 pounds to 150 pounds, because flight test experience indicates that 180 pounds may make control too difficult for some pilots under some flight conditions.
All available on the FAA website ww.faa.gov -
Historical Federal Aviation Regulations then select the specific section under "Historical FAR by section", and you'll be presented with the history of the amendments to any given rule.