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T E C H N I C A L M E M O

 TMUSA4148052015TM

This document and/or the documents accompanying this facsimile contain information from TURBOMECA, which may be confidential 

and/or legally privileged. THE DOCUMENTS ARE INTENDED ONLY FOR THE PERSONAL AND CONFIDENTIAL USE OF THE ADDRESSEE 

IDENTIFIED ABOVE. Any other use, duplication or disclosure of said information remains subject to TURBOMECA prior written consent.

2709 Forum Drive www turbomeca.com Tel : +1 972.606.7600

Grand Prairie, Texas 75052 www.turbomeca-usa.com Fax: +1 972.606.8166

To: NorthStar Trekking From: Mike Whiteman

Attn: Director of Operations Date: May 20, 2016

Ref: In Flight Shut Down Rate Pages: 1

Re: Mean Time Between Failures (MTBF) cc: Bob Snow

Subject: Arriel 2D In Flight Shut Down Rate

Sir: 

The Arriel 2D un-commanded IFSD rate is as follows;

 During the engine design, we predict (in the safety analysis done for the engine certification) the engine uncommanded IFSD rate, is assessed for 2D at 3.10-6 failure / engine flight hours (this means 3 failure for 1 

million of hours, that’s to say a Mean Time Between Failure of more than 300 000 hours), 

 The in service experience is followed through airworthiness following (IFSD annual rate assessed for EASA, 

and for CAT POL (rate of sudden major loss of power (loss higher than 30% of power)

The Arriel engine fleet data with the MTBUR removal information for the Arriel 2 single engine variants for the year 

are calculated over a 12 month period and are based on the amount of hours flown during that 12 months period 

divided by the reported engine removals. This information is updated every six months.

The individual Arriel 2D fleet flight data for the last 12 month period (June 2014 to June 2015) are a total 

accumulated flight time/engine removals based on a total flight hours of 163 000 hours

 MTBR: 3300 hours

 MTBUR: 5900 hours

 MTBF: 11000 hours

The Arriel 2 single fleet flight data for the last 12 month period (June 2014 to June 2015) are a total accumulated 

flight time/engine removals for the Arriel 2 single engine aircraft based on a total flight hours of 630 000 hours

 MTBR: 1600 hours

 MTBUR: 3400 hours

 MTBF: 6500 hours

These numbers include all Arriel 2 single engines (Arriel 2B, 2B1, 2B1A, 2D) combined. The information provided is 

to show the Arriel 2D information relative to the global fleet has a higher availability.

Please contact your Field Representative or me directly, should you require any further information.

text/markdown


# T E C H N I C A L M E M O

TMUSA4148052015TM

This document and/or the documents accompanying this facsimile contain information from TURB OMECA, which may be confidential

and/or legally privileged. THE DOCUMENTS ARE INTENDED ONLY FOR THE PERSONAL AND CONFIDENTIAL USE OF THE ADDRESSEE

IDENTIFIED ABOVE. Any other use, duplication or disclosure of said information remains subject to TURBOMECA prior written consent.

2709 Forum Drive www turbomeca.com Tel : +1 972.606.7600

Grand Prairie, Texas 75052 www.turbomeca

- usa.com Fax: +1 972.606.8166 To: NorthStar Trekking From: Mike Whiteman

Attn: Director of Operations Date: May 20, 2016

Ref: In Flight Shut Down Rate Pages: 1

Re: Mean Time Between Failures (MTBF) cc: Bob Snow

Subject : Arriel 2D In Flight Shut Down Rat e

Sir:

The Arriel 2D un

- commanded IFSD rate is as follows;

 D uring the engine design, we predict (in the safety analysis done for the engine certification) the engine un

commanded IFSD rate, is assessed for 2D at 3.10

- 6 failure / engine flight hours (th is means 3 failure for 1

million of hours, that’s to say a Mean Time Between Failure of more than 300 000 hours),

 T he in service experience is followed through airworthiness following (IFSD annual rate assessed for EASA,

and for CAT POL (rate of sudden m ajor loss of power (loss higher than 30% of power)

The Arriel engine fleet data with the MTBUR removal information for the Arriel 2 single engine variants for the year

are calculated over a 12 month period and are based on the amount of hours flown during that 12 months period

divided by the reported engine removals . This information is updated every six months

.

The individual Arriel 2 D fleet flight data for the last 12 month period (June 2014 to June 2015) are a total

accumulated flight time /engine rem ovals based on a total flight hours of 163 000 hours

 MTBR: 3300 hours

 MTBUR: 5900 hours

 MTBF: 11000 h ours

The Arriel 2 single fleet flight data for the last 12 month period (June 2014 to June 2015) are a total accumulated

flight time/engine removals for the Arriel 2 single engine aircraft based on a total flight hours of 630 000 hours

 MTBR: 1600 hours

 MTBUR: 3400 hours

 MTBF: 6500 hours

These number s include all Arriel 2 single engines (Arriel 2B, 2B1, 2B1A, 2D) combined. The information provided is

to s how the Arriel 2D information relative to the global fleet has a higher availability.

Please contact your Field Representative or me directly, should you require any further information.