EASA AD 2017-0034R1: Engine — Gearbox — Modification / Inspection

What to do

Operators of aircraft equipped with TAE 125-02-99 and TAE 125-02-114 engines must replace the clutch with a dual mass flywheel within 55 flight hours after 6 March 2017 and inspect the gearbox for oil leaks concurrently. If leaks are found, the affected gearbox must be replaced before the next flight. Additionally, installation of affected gearboxes and clutches on engines or aircraft is prohibited from 6 March 2017 onward. Compliance must follow the instructions in Service Bulletin TMG 125-1020 P1 revision 1.

Summary

EASA Airworthiness Directive 2017-0034R1 is a regulatory document addressing safety concerns related to Technify Motors GmbH TAE 125-02 engines installed on various aircraft including Diamond DA 40, DA 42, DA 42M, CEAPR DR 400, Cessna 172, and Piper PA-28. The directive mandates modification and inspection of the engine gearbox and clutch system to prevent oil leaks and potential engine power loss. It specifically targets affected gearboxes identified by part and serial numbers and requires replacement of the clutch with a dual mass flywheel.

What changed

This revision of EASA AD 2017-0034 updates the identification criteria for affected gearboxes to include both part numbers and serial numbers, refining the scope of inspection and replacement requirements. It also references the updated Service Bulletin TMG 125-1020 P1 revision 1 for modification and inspection procedures. The revision clarifies compliance instructions and parts installation restrictions to enhance safety measures.

Why it matters

This directive is critical for aviation professionals as it addresses a safety issue that could lead to permanent engine power loss due to gearbox oil leakage and clutch contamination. Operators and maintenance organizations must ensure compliance to maintain aircraft airworthiness and prevent in-flight power failures. The AD also affects parts installation practices, requiring strict adherence to avoid installing affected gearboxes or clutches that do not meet the updated safety standards.