CTHIn ForceLegislation
AD/APU/20 - Hamilton Sundstrand Compressor Impeller Assemblies
Auxiliary Power UnitsAuxiliary Power Units
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Auxiliary Power Units
| AD/APU/20 | Hamilton Sundstrand CompressorImpeller Assemblies | 3/2006 |
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| Applicability: | Hamilton Sundstrand Power Systems (formerly Sundstrand Power Systems) auxiliary power units (APUs) models T-62T-46C2, T-62T-46C2A, T-62T-46C3, T-62T-46C7, and T-62T- 46C7A, with compressor impeller assembly, part number (P/N) 4502020 or 4502020A installed.Note 1: These APUs are installed on, but not limited to, BAE Systems AVRO 146, Fokker 50, Saab 2000, and Saab 340 aeroplanes. |
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| Requirement: | Remove compressor impeller assemblies from service.Note 2: FAA AD 2005-23-11 Amdt 39-14369 refers. |
| Compliance: | For APUs with compressor impeller assemblies that have 12,000 or more cycles-since-new (CSN) accumulated on the effective date of this AD; before accumulating 500 additional cycles.For APUs with compressor impeller assemblies that have fewer than 12,000 CSN on the effective date of this AD; before accumulating 12,500 CSN. |
| This Airworthiness Directive becomes effective on 16 March 2006. | |
| Background: | This AD results from two reports of uncontained failures of compressor impeller assemblies. The issuing of this AD is to prevent an uncontained APU failure and damage to the aeroplane. |
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James Coyne
Delegate of the Civil Aviation Safety Authority
1 February 2006