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Diamond Aircraft SI 42NG-039: No revision named

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© Diamond Aircraft. Filed by the FAA in regulations.gov docket FAA-2013-0247, the docket of AD 2013-06-02. Not covered by OpenAirDocs’ CC0 dedication.

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• Diamond AIRCRAFT Diamond Aircraft Industries GmbH A-2700 Wiener Neustadt N.A. Otto-Straße 5 DAI SI 42NG-039 14-Nov-2012 Page 1 of 1 Austria FT

SERVICE INFORMATION No. SI 42NG-039 NOTE: SI's are used only:

1) To distribute information from DAl to our customers.

2) To distribute applicable information/documents from our suppliers to our customers with additional information.

Typically there is no revision service for Sl's. Each new information or change of that will be sent along with a new SI.

I. TECHNICAL DETAILS

1.1 Airplanes affected:

All DA 42 NG /M-NG airplanes

1.2 Subject:

Induction System - Abnormal/Emergency Procedures - Alternate Air when encountering Induction Filter cing ATA-Code: 71-60

1.3 Reason:

Power losses because the alternate air valve was not opened.

1.4 Information:

The DA 42 NG/M-NG has been approved for flight into known icing conditions by EASA in June 2009. Since then more than 110 airplanes equipped with the anti-icing system have been delivered world-wide.

In Europe's winter season of 2011/2012 three ECUA/B Caution events followed by an uncommanded power reduction during flight in snow and icing conditions have been reported to DAI. The power reduction healed itself when descending into warmer air masses. In all three cases the alternate air valve was not opened by the pilot as requested by the Airplane Flight Manual (AFM) Emergency Procedures.

Last week another similar event was reported to DAI. Again, the pilots did not go through the full emergency check list and did not open the alternate air valve. Post flight inspection revealed evidence of induction filter icing. Light icing conditions were reported but rain, thunderstorms and snow was in close proximity to the airplane.

From the reported weather conditions during all four reported events no systematic issue could be derived neither could it be determined if the weather conditions were within the certified icing envelope. In any case, safety is not jeopardized, as exactly for such cases, the alternate air system is designed.

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Diamond Diamond Aircraft Industries GmbH N.A. Otto-Straße 5 DAI SI 42NG-039 Page 2 of 1 AIRCRAFT A-2700 Wiener Neustadt 14-Nov-2012 Austria FT With this Service Information DAl emphasizes the full application of emergency procedures as published in the AFM.

In addition DAI reacts to the above mentioned events with a revision of the AFM Supplements S03 "Ice Protection System".

The opening of the alternate air valve when facing an ECUA/B Caution event in icing or visible moisture conditions is put into the Abnormal Procedure for that caution event.

See Chapter 4B of AFMS S03, Revision 3 for the DA 42 NG and Revision 1 for the DA 42 NG with MAM 42-600 installed.

With the revisions of the AFM Supplements, the opening of the alternate air valve is a preventive action against possible induction filter icing rather than a reaction to un-commanded power reduction in the emergency procedure "Abnormal Engine Behavior".

All pilots and operators are reminded to always use the latest published AFM and Supplements.

For download please visit our website www.diamond-air. at.

II. OTHERS In case of doubt contact Diamond Aircraft Industries.

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