Commonwealth legislation

AD/TPE 331/21 - Fuel Pump Spline Wear Inspection and/or Replacement

RepealedCTH

This Act has been repealed and is no longer in force. It is retained for historical reference.

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

2/10 complexity

This safety directive requires aircraft operators to inspect the fuel pump splines (the interlocking teeth that connect the fuel pump to the engine) on specific AlliedSignal (Garrett) TPE 331 turbine engines for wear damage.

Who it affects: Owners and operators of aircraft fitted with TPE 331-3U-303G, -3UW-303G, or -3U-304G model engines.

What you must do: Follow the inspection procedures in Garrett Service Bulletin TPE 331-73-0033 (Revision 5) to check for wear on the fuel pump splines. If wear is found, the parts must be replaced.

What's changed: This update adds the 331-3U-304G engine model to the safety requirements and extends the inspection interval to 3,000–3,200 flight hours (increasing the time allowed between inspections compared to previous requirements).

Why it matters: Worn fuel pump splines can cause fuel delivery failures, potentially leading to engine shutdown or loss of power during flight. These inspections prevent catastrophic mechanical failures.

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Current sections

Direct links to the current provisions in AD/TPE 331/21 - Fuel Pump Spline Wear Inspection and/or Replacement.

AD/TPE 331/21 - Fuel Pump Spline Wear Inspection and/or Replacement

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

AD/TPE 331/21 Fuel Pump Spline Wear Inspection

and/or Replacement

Applicability: TPE 331-3U-303G, -3UW-303G, -3U-304G.

Document: Garrett Service Bulletin No. TPE 331-73-0033, Rev. 5.;or AD/AIR-T/26 Amdt 2.

Compliance: In accordance with the requirement document.

Background: This Directive is raised in issue to include the 331-3U-304G and extend the inspection interval for fuel pump spline inspection to 3000-3200 hours.

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Source text

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