Summary
The FAA proposes to supersede an existing airworthiness directive (AD) for Hartzell Propeller Inc. Model HC-B5MP-3C/M10876K propellers, installed on Short Brothers Model SD3-60 airplanes. That AD currently requires initial and repetitive removal, disassembly, inspection, and rework if necessary of Hartzell Propeller Inc. Model HC-B5MP-3C/M10876K propellers until blades are replaced with new design blades, no later than March 31, 1988. This proposed AD would require installation of new design blades before further flight, on Hartzell Propeller Inc. Models HC-B5MP-3C/M10876K propellers. This proposed AD is prompted by a review of all currently effective ADs. That review determined that AD 87-16-02 was not published in the Federal Register to make it effective to all operators, as opposed to just the operators who received actual notice of the original AD. We are proposing this AD to prevent propeller blade separation near the hub, which could result in engine separation from theairplane.