AD/PHZL/92 Propeller Blade Counterweight Slug Attach Bolts (Cth)
AIRWORTHINESS DIRECTIVE
For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.001(1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.
Propellers - Variable Pitch - Hartzell
| AD/PHZL/92 | Propeller Blade Counterweight Slug Attach Bolts | 8/2009 |
Applicability: | Hartzell Propeller Inc. steel hub turbine propellers listed in Table 1 of this AD, with any counterweight slug attachment bolts, part number (P/N) B-3386-14H, LFC manufacturing lot 224, installed. Note 1: These propellers are installed on, but not limited to, the aeroplanes listed in Table 1 of this AD. Table 1
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Requirement: | Identify and remove all propeller blade counterweight slug bolts, P/N B-3386-14H, LFC manufacturing lot 224, from service, and install serviceable bolts. Use paragraphs 3.A.(1) through 3.A.(4)(b)5 of the Accomplishment Instructions of Hartzell Propeller Inc. ASB No. HC- ASB-61-313, Revision 2, dated 27 March 2009, to do the identification, removals from service, and installations. For the purpose of this AD, a serviceable propeller blade counterweight slug bolt is a P/N B-3386-14H bolt with an LFC manufacturing lot other than lot 224. Note 2: FAA AD 2009-10-14 Amdt 39-15910 dated 8 May 2009 refers. | |||||||||||||||||||||||||||||||||||||||||||||||||||||
Compliance: | Within 50 flight hours after the effective date of this AD, unless the actions have already been done. | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| This Airworthiness Directive becomes effective on 30 July 2009. |
Background: | This AD results from two reports of failure of the bolts that attach the propeller blade counterweight slug, and separation of the counterweight slug which led to propeller vibration and damage to the propeller spinner. Investigation by Hartzell Propeller Inc. revealed that the bolts failed due to a bolt manufacturing defect. The issuing of this AD is intended to prevent separation of the propeller blade counterweight slug, which could lead to injury and damage to the aeroplane. |
James Coyne
Delegate of the Civil Aviation Safety Authority
16 June 2009
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