EASA SIB 2008-88: WITHDRAWN - REPLACED BY FAA AD 2009-10-14

What to do

Affected operators should review Hartzell Propeller Inc. Alert Service Bulletin HC-ASB-61-313 and conduct inspections of the B-3386-14H counterweight slug attachment bolts as recommended. Although the bulletin is informational and not mandatory, compliance with the inspection guidance is strongly advised. For further information, stakeholders should contact EASA or Hartzell technical support.

Summary

EASA Safety Information Bulletin 2008-88 is an informational bulletin addressing the inspection of propeller counterweight slug bolt failures on certain Hartzell propeller models. The affected propellers include the HC-A3VF-( ), HC-B3MN-( ), HC-B3TF-( ), HC-B3TN-( ), HC-B4MN-( ), HC-B4MP-( ), HC-B4TN-( ), HC-B5MA-( ), and HC-B5MP-( ) series, which are installed on various aircraft as detailed in Hartzell Propeller Inc. Alert Service Bulletin HC-ASB-61-313 dated 17 November 2008. This bulletin warns of bolt failures that may cause counterweight slug separation, potentially leading to aircraft damage and safety risks.

What changed

This bulletin informs owners and operators about reported failures of B-3386-14H counterweight slug attachment bolts and supports the inspection recommendations issued by Hartzell Propeller Inc. It does not introduce mandatory requirements but signals that future airworthiness directives may be issued. The bulletin replaces previous guidance by referencing FAA AD 2009-10-14.

Why it matters

The bulletin highlights a safety concern that could affect aircraft control and structural integrity due to propeller counterweight slug separation. Aviation professionals, including operators and maintenance organizations, need to be aware of these risks to prevent in-flight failures and potential ground injuries. Early awareness allows for proactive inspection and maintenance planning to ensure continued airworthiness.