Sec. 23.907 - Propeller vibration.
(a) Each propeller other than a
conventional fixed-pitch wooden propeller must be shown to have vibration
stresses, in normal operating conditions, that do not exceed values that
have been shown by the propeller manufacturer to be safe for continuous
operation. This must be shown by --
(1) Measurement of stresses through
direct testing of the propeller;
(2) Comparison with similar
installations for which these measurements have been made; or
(3) Any other acceptable test method or
service experience that proves the safety of the installation.
(b) Proof of safe vibration
characteristics for any type of propeller, except for conventional,
fixed-pitch, wood propellers must be shown where necessary.
[Doc. No. 4080, 29 FR 17955, Dec. 18, 1964; 30
FR 258, Jan. 9, 1965, as amended by Amdt. 23-51, 61 FR 5136, Feb. 9, 1996]