AD/SD3-30/23 Amdt 2 Propeller Attaching Bolts (Cth)
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 revokes Airworthiness Directive (AD) AD/SD3-30/23 Amdt 1 and issues the following 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.
Short SD3-30 Series Aeroplanes
| AD/SD3-30/23 Amdt 2 | Propeller Attaching Bolts | 9/2005 |
Applicability: | Hartzell Propeller Inc. (formerly Hartzell Propeller Products Division) Model |
Requirement: | 1. Perform an initial torque check inspection of the Hartzell propeller attach bolts, P/N B-3339. Use Procedure 1 "Mounting Bolt Torque Check" of Hartzell Alert Service Bulletin (ASB) A203A, dated 5 January 1995, to do the inspections. 2 If the torque check fails, remove the propeller and do the following: Inspect and rework if necessary, the engine and propeller mounting flange surfaces. Use Procedure 2 "Engine/ Propeller Mounting Flanges" of Hartzell ASB A203A, dated January 5, 1995, to do the inspections and rework. Also inspect the hub mounting bolt holes as follows: (a) Clean bolt holes using Stoddard solvent or equivalent and a soft bristle brush. (b) Visually inspect the area around the bolt holes. No deformations, evidence of rework, depressions, or protrusions around bolt holes are permitted, except for an edge chamfer of the bolt hole up to 0.030 inch. (c) Using a 10X magnification, and an appropriate light source, visually inspect threads for chipping, missing material, deformation, and scratches. No damage is permitted. (d) Using a new P/N B-3339 bolt, check threads by threading bolt by hand into the bolt hole. The bolt must thread in easily with no binding. (e) Any hub with a bolt hole showing one or more of the prohibited conditions specified in requirements 2(b) through 2(d) of this Directive must be removed from service. 3. Apply anti-seize compound MIL-PRF-83483, to the threaded surfaces of the attach bolt. Do not use any other anti-seize compound on attach bolts. |
| 4. Before installing a Hartzell HC-B5MP-3( )/M10282A( )+6 propeller, the propeller mounting flange and engine flange must be clean and dry. Do not use anti-fretting compounds on the flanges. You may install an approved Pratt & Whitney shim between the propeller mount flange and engine flange. Note: FAA AD 2004-21-01 Amdt 39-13822 refers, which supersedes FAA AD | |
Compliance: | 1. Unless already done within 120 hours time-in-service (TIS) before the effective date of this AD, initial check to be done before further flight and thereafter at intervals not to exceed 120 hour TIS intervals since the last inspection. 2 Before further flight. 3. Before installing any Hartzell propeller attach bolt P/N B- 3339 after the effective date of this Directive. 4. From the effective date of this Directive. |
| This Amendment becomes effective on 1 September 2005. | |
Background: | This Directive requires repetitive torque check inspections and requires additional visual inspections of mounting flanges, and threads in hub bolt holes and replacement of attach bolts and hubs, if necessary. This Directive is in response to results from four reports in the last 12 months of eleven cracked or failed propeller attach bolts on Short Brothers Model SD3-30 aeroplanes. This Directive is issued to prevent propeller separation from the aeroplane. The original issue of this Airworthiness Directive became effective on 8 December 1994. |
James Coyne
Delegate of the Civil Aviation Safety Authority
15 July 2005
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