Commonwealth legislation

AD/APU/8 - Garrett APU Compressor Rotating Group

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Commonwealth

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legislative instrument

Plain English Summary

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This directive requires operators of Garrett GTCP36-300 and GTCP36-280 (‑280[B]/‑280[D]) APUs to follow two Garrett Service Bulletins to rework load/engine compressors and replace the compressor shaft by 30 Sept 1995. It responds to incidents where compressor rim failure caused shaft ejection and firewall penetration. Affected operators bear the costs and downtime to eliminate the safety risk.

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AD/APU/8 - Garrett APU Compressor Rotating Group

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Auxiliary Power Units

AD/APU/8 Garrett APU Compressor Rotating Group 4/93

Applicability: Garrett Model GTCP 36-300,-280[B] and -280[D] Requirement: Action in accordance with Garrett Service Bulletins:

A. For the GTCP36-300, GTCP36-49-A6642 1 May 1992.

B. For the GTCP36-280, GTCP36-49-A6653 1 May 1992.

Note: FAA AD 92-21-05 refers.

Compliance: To be completed by 30 September 1995.

Background: There have been two incidents in which rim separation in the dampening groove of the load compressor has resulted in rotating group unbalance severe enough to cause tieshaft failure just aft of the compressor shaft. The resultant translational energy caused the compressor shafts to exit the APU inlet plenum and penetrate the aircraft firewall. This directive involves rework of the load and engine compressors and replacement of the compressor shaft.

Source text

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

1 AD/APU/8 - Garrett APU Compressor Rotating Group