Federal Register of Legislation
AIRWORTHINESS DIRECTIVE On the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below repeals Airworthiness Directive (AD) AD/PHS/18 Amdt 3 and issues the following AD under subregulation 39.001 (1) of CASR 1998 and subsection 33 (3) of the Acts Interpretation Act 1901. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct an 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 - Hamilton Standard AD/PHS/18 Amdt 4 Hub Cracking 20/2014
Applicability: All model 14RF-9, 14RF-19 and 14RF-21 propellers.
Note 1: These propellers may be installed on but are not limited to Embraer EMB-120 series, CASA CN-235 series and SAAB SF-340 series aircraft. Requirement: 1. (a) Perform a torque check of the propeller hub retaining nuts, in accordance with the applicable Hamilton Sundstrand Maintenance Manual (MM).
(b) Remove from service propellers where the hub retaining nuts are found not to meet the acceptance criteria outlined in the applicable Hamilton Sundstrand MM.
(c) Inspect hub dowel pin holes for cracks in accordance with the applicable Hamilton Sundstrand MM using the prescribed fluorescent penetrant inspection method.
(d) Remove from service propeller hubs with crack indications.
(e) If the initial propeller hub retaining nut torque check per requirement 1.(a) is acceptable in accordance with the applicable Hamilton Sundstrand MM, support the propeller with an appropriate lifting fixture and loosen the propeller hub retaining nuts. Tighten the propeller hub retaining nuts as detailed in the applicable Hamilton Sundstrand MM.
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