Document ID: chunk:federal_register_of_legislation:F2006B02292:body:0:p1
Version: federal_register_of_legislation:F2006B02292
Segment Type: other
Provision Reference: 
Character Range: 20–3293

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 39.1 (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.

 Allison Turbine Engines - 250 Series

AD/AL 250/83 Third-Stage Turbine Wheels 10/2004

            Applicability:  Rolls-Royce Corporation (formerly Allison Engine Company), models 250-C28, - C28B, and -C28C turboshaft engines with third-stage turbine wheels, part number (P/N) 6899383, listed by serial number (SN) in Table 1 of this Directive:

                    Table 1. - SNs of Affected Third Stage Turbine Wheels

HX91922  X523242   X523281
HX91923  X523243   X523283
HX91925  X523244   X523284
HX91926  X523246   X523287
HX91928  X523249   X523288
HX91929  X523250   X523289
HX91930  X523251   X523290
HX91932  X523253   X523291
HX91934  X523255   X523292
HX91936  X523257   X523293
HX91937  X523260   X523294
HX91939  X523261   X523295
HX91940  X523262   X523296
HX91960  X523263   X523297
HX91962  X523264   X523298
HX91966  X523265   X523300

HX91976  X523266   X523305
HX91977  X523268   X523309
HX91979  X523269   X523313
HX91980  X523270   X523315
X523236  X523271   X523317
X523237  X523273   X523319
X523238  X523276   X523320
X523239  X523277
X523241  X523278

            Note 1: These engines are installed on, but not limited to, Bell Helicopter Textron 206L-1; Eurocopter Deutschland BO 105 LS A-1; and Eurocopter Canada BO 105 LS A-3 helicopters.

              Requirement: 1. Replace the third-stage turbine wheel with a turbine wheel not listed in Table 1 of this Directive.

              2. Do not install third- stage turbine wheels that are listed in Table 1 of this AD, into any engine.

            Note 2: FAA AD 2004-14-02 Amdt 39-13711 refers.

            Compliance:  For Requirement 1: For third-stage turbine wheels with less than 250 operating hours' time since new (TSN) on the effective date of this Directive, before accumulating 300 operating hours TSN.

            For any third-stage turbine wheel with 250 or more operating hours TSN on the effective date of this Directive, before accumulating an additional 50 operating hours.

            For Requirement 2: From the effective date of this Directive.

            This Airworthiness Directive becomes effective on 30 September 2004.

            Background: This Directive results from three reports of third-stage turbine wheel blade and shroud failures. The issue of this Directive is to prevent loss of power and uncommanded engine shutdown due to failure of the third-stage turbine wheel blade and shroud.

 Gary J Carr
 Delegate of the Civil Aviation Safety Authority 5 August 2004

 The above AD is notified in the Commonwealth of Australia Gazette on 8