Commonwealth legislation

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

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Commonwealth

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legislative instrument

Plain English Summary

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Mechanically, this Airworthiness Directive orders owners/operators to take corrective action for specific Rolls‑Royce (Allison) 250‑C28, -C28B and -C28C turboshaft engines fitted with third‑stage turbine wheels P/N 6899383 listed by serial number in Table 1. It is issued by a CASA delegate under subregulation 39.1(1) of CASR 1998 to address an identified unsafe condition. Affected aircraft operators and maintenance organisations must follow the AD’s requirement and compliance sections and will bear the operational and financial consequences of inspections, repairs or part removals.

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AIRWORTHINESS DIRECTIVE

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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.

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Allison Turbine Engines - 250 Series

AD/AL 250/83 Third-Stage Turbine Wheels

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 T

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

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

AIRWORTHINESS DIRECTIVE AIRWORTHINESS DIRECTIVE

AIRWORTHINESS DIRECTIVE

Allison Turbine Engines - 250 Series

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

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

Table 1. - SNs of Affected Third Stage T Table 1. - SNs of Affected Third Stage Turbine Wheels

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