Commonwealth legislation

AD/ARRIEL/9 - Overspeed Sensor

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

Requires operators of specified Turbomeca Arriel helicopter engines to perform a one‑time electrical check of the power‑turbine overspeed sensor, using Turbomeca Service Bulletin 292‑77‑0194 Revision 1. It applies to the listed Arriel models (excluding engines incorporating modification TU 13) and addresses a reported reversed connection between the sensor coils and the helicopter electrical harness that could stop the sensor working correctly.

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AD/ARRIEL/9 - Overspeed Sensor

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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 Turbomeca Turbine Engines - Arriel Series

AD/ARRIEL/9 Overspeed Sensor 4/95

Applicability: Arriel 1A, 1A1 engines not incorporating modification TU 13, plus Arriel 1A2, 1C, 1C1, 1C2, 1E, 1E2, 1K, 1K1, 1S and 1S1 engines.

Requirement: Carry out a check of the power turbine overspeed sensor in accordance with Turbomeca Arriel Service Bulletin 292-77-0194 Revision 1.

Note: DGAC Airworthiness Directive 94-218(B) refers.

Compliance: Prior to 30 April 1995.

Background: This Directive requires a once only check of the overspeed detector sensor to establish correct electrical connection. The requirement follows advice of a reversed connection between the two coils of the free power turbine overspeed sensor and the connector linking the sensor to the helicopter electrical harness.

Source text

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