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Recommendation issued to: Direction General de L'Aviation Civil

Recommendation details
Output No: R20010197
Date issued: 18 September 2001
Safety action status:
Background: Why this Recommendation was developed

Output text

The Australian Transport Safety Bureau recommends that the Direction Generale de l'Aviation Civile (DGAC) take appropriate action to ensure the continued airworthiness of aircraft fitted with Turbomeca Arriel engines incorporating modification TU204.

Initial response
Date issued: 15 January 2001
Response from: Direction General de L'Aviation Civil
Action status: Closed - Partially Accepted
Response text:

We acknowledge receipt of the to Air Safety Recommendations R20010193 and R20010197 from the Australian Transport Safety Bureau which relate to Arriel engine failure.

These recommendations were carefully analysed and I am pleased to provide our conclusions which are the following:

R20010197: taking into account the possible occurrence rate (probability calculation) of a double engine failure on twin engine helicopters and the fact it is no longer possible to install or repair blades modified by TU 204, there is no need to take a specific action for twin engine helicopters.

However, as a conservative approach, DGAC will mandate by airworthiness directive the replacement of all these blades on single engine helicopters.

Appendixes attached to this letter describe DGAC's approach in more details.

 
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Last update 01 April 2011