Commonwealth legislation

AD/TPE 331/26 Amdt 1 - Installation of Direct Drive Fuel Control

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Commonwealth

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legislative instrument

Plain English Summary

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This airworthiness directive requires operators of specified AlliedSignal (Garrett/AiResearch) TPE/TSE 331-series turboprop engines to install a modified engine fuel-control drive train in the main reduction gearbox by following Garrett Service Bulletin TPE 331-72-0061 Revision 5 (as adopted from FAA AD 78-25-08 Revision 3). It affects aircraft owners and maintenance organisations who must fund and schedule the retrofit to address fuel-control-unit drive problems and increase N2 overspeed protection. Amendment 1 removes the earlier mandatory requirement to fit a modified torque sensor.

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AD/TPE 331/26 Amdt 1 - Installation of Direct Drive Fuel Control

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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AlliedSignal (Garrett/AiResearch) Turbine Engines - TPE 331 Series

AD/TPE 331/26

Amdt 1

Installation of Direct Drive Fuel Control 1/92

Applicability: TSE 331-3 and TPE 331-1, -2, -3, -5 and -6 series engines as listed by model and part number in Garrett Service Bulletin TPE 331-72-0061 Revision 5.

Requirement: Incorporate the modified engine fuel control drive train in the main reduction gearbox in accordance with FAA AD 78-25-08 Revision 3 Amdt 39-3787. (Garrett SB TPE 331-72-0061 Revision 5 refers).

Note: Equipment modified in accordance with previous issues of this Directive, or with AD/AIR-T/35 Amdt 3, do not require further rework.

Compliance: The compliance date of the original issue of this Directive was 31 December 1985.

This re-issue is effective from 12 January 1992.

Background: This Directive was originally issued for the purpose of increasing N2 overspeed protection by the incorporation of SB 72-0061 and 72-0232 as a result of FCU drive problems experienced in Australia. Amendment 1 has the effect of aligning the Authority requirements with that of the FAA by removing the mandatory requirement to fit a modified torque sensor.

Source text

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

1 AD/TPE 331/26 Amdt 1 - Installation of Direct Drive Fuel Control