Four-blade prop for Metro II | Aviation International News

Maintenance and Modifications

Four-blade prop for Metro II

Hartzell has introduced a four-bladed aluminum propeller conversion for the Fairchild Metro II that the company said reduces sound levels by 10 to 12 dBA,

By Gordon Gilbert • Contributor - Accidents and Regulations

May 7, 2008

Hartzell has introduced a four-bladed aluminum propeller conversion for the Fairchild Metro II that the company said reduces sound levels by 10 to 12 dBA, providing a quieter cabin and lower external noise. The diameter of the new prop system is reduced by five inches from that of the original three-blade system. An “advanced airfoil configuration” was also applied to the new blades, said Hartzell.

The new 97-in.-diameter blades are designed to reduce maintenance and operating costs “through the reduction in propeller-blade erosion from the shorter diameter and subsequently greater ground clearance,” said Hartzell. Also, the wide-chord design was specifically developed and tested to “provide more generous blade repair limits than the standard three-blade prop,” and the new blades eliminate the hub replacement compliance costs associated with AD 96-18-14.

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