Commonwealth legislation

AD/APU/12 - Compressor Wheel

In ForceCTH

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Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

Requires replacement of specified Sundstrand T-62T-40C APU compressor wheels (P/No 162690-1, 165111-1, 167200-1) in accordance with Sundstrand Service Bulletin T-62T-49-120 Rev 2. CASA enforces the directive; aircraft operators (owners) must arrange and pay for the replacements and follow the service bulletin's compliance steps, because the manufacturer reported three failures from fatigue cracks at screw holes that could cause uncontained APU rupture and aircraft damage.

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AD/APU/12 - Compressor Wheel

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COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source Auxiliary Power Units

AD/APU/12 Compressor Wheel 8/97

Applicability: Sundstrand Aerospace T-62T-40C series Auxiliary Power Units incorporating Compressor Wheel, P/No 162690-1, 165111-1 or 167200-1

Requirement: Replace affected compressor wheels in accordance with Sundstrand Aerospace Service Bulletin T-62T-49-120 Revision 2 dated 5 November 1996.

Note: FAA AD 96-25-12 also refers.

Compliance: As detailed in the requirement document.

This airworthiness directive becomes effective on 17 July 1997.

Background: The manufacturer has advised three compressor wheel failures have occurred as a result of fatigue cracks propagating from screw holes on the backface of the compressor wheel.

Compressor wheel rupture could result in an uncontained APU failure and damage to an aircraft.

Source text

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