Division Boeing 737 Series Aeroplanes - AD/B737/259 - Fail-Safe Straps of the Nose Cowl Engine Inlet Attach Ring - Boeing 737 Series Aeroplanes

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AD/B737/259	Fail-Safe Straps of the Nose CowlEngine Inlet Attach Ring	13/2005

Applicability:	Model 737-200 and -200C series aircraft, equipped with dB Partners Hush Kit having attach ring, part number 65ND-54301-1, installed in accordance with Supplemental Type Certificate (STC) SA5730NM.
Requirement:	Action in accordance with FAA AD 96-04-03 Amdt 39-9514.Note: Nordam Service Bulletins SB 71-03, SB 71-03 Revision 1, and SB 71-04 Revision 1, or later FAA approved revisions, refer.
Compliance:	As specified in the Requirement document, with a revised effective date of22 December 2005.
	This Airworthiness Directive becomes effective on 22 December 2005.
Background:	The FAA received reports of failure of reworked turbine blades, and subsequent failure of engine inlet attach ring. This Directive requires repetitive inspections to detect cracking of the attach ring of the nose cowl, until replacement with an improved attach ring that eliminates the need for repetitive inspections. The actions specified by this Directive are intended to prevent cracking of the attach ring of the nose cowl, which could result in separation of the nose cowl from the engine following failure of a turbine blade.

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David Villiers
Delegate of the Civil Aviation Safety Authority

10 November 2005