Commonwealth legislation

AD/AL 250/4 - Sixth Stage Compressor Blades - Modification

In ForceCTH

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Commonwealth

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legislative instrument

Plain English Summary

3/10 complexity

This directive requires owners/operators to modify the sixth-stage compressor blades on specified Allison 250-C18 and 250-C18A engines (those with compressor assemblies before listed serial numbers) using Allison CEB No. 250 CEB-48.

The work must be done before the next flight after 19 June 1968; operators bear the cost and downtime. It’s a mandatory airworthiness fix; no operational discretion to defer.

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AD/AL 250/4 - Sixth Stage Compressor Blades - Modification

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COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source Allison Turbine Engines - 250 Series

AD/AL 250/4 Sixth Stage Compressor Blades - Modification 6/68

Applicability: All model 250-C18 fitted with compressor assemblies prior to S/N CAC 20873 and Model 250-C18A fitted with compressor assemblies prior to S/N CAC 20188.

Document: Allison CEB No. 250 CEB-48. Compliance: Before further flight after 19 June 1968.

Source text

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