AD/AL 250/83 - Third-Stage Turbine Wheels (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 39.1 (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.