Jamhands Posted September 27, 2011 Report Share Posted September 27, 2011 Company received a service letter from Eurocopter pertaining to an incident involving a loss of engine oil pressure in an EC 120 in flight. (See Below) The point of the letter was to reiterate the flight manual's procedure for a loss of oil pressure in flight. This simply states the pilot should apply the autorotational procedure described for an ENGINE FLAME OUT which includes rolling the throttle to the shut off detent. Any ambiguity about whether a loss of oil pressure should be taken slightly differently than a loss of oil pressure has been straightened out by this service letter from Eurocopter and IMHO they are two very different scenarios. It has always been clear in my head that in the case of a loss of engine oil pressure, entering autorotation and landing immediately is obvious but shutting down a running engine seems like a poor choice. I for one would take my chances and take advantage of any power said engine might produce at the end rather than shut it down pre-emptively. Thoughts? S;arnnN SERVICE LETTER To the attention of maintenance and flight personnel CUSTOMER SUPPORT AND SALES DIVISION 40220 Tarnos - France Tel, (33)(0)5s9744000 Telex 570 042 Fax (33) (0) 5 59 64 74 98 Technical Support Department Fax (33) (0) 5 59 74 45 34 JSV/CD/ML Service Letter No. 281 8/1 1/ARRIUS2F Subject: ARRIUS 2 F Uncommanded in-flight shut-down following illumination of engine Low Oil Pressure warning Iight. Bordes, August 22,2011 Dear Sir or Madam, This Service Letter contains the findings of investigations conducted following an uncommanded in-flight shuldown that occurred on an ARRIUS 2F engine in August 2010 during the final phase of landing. During a commercial flight, the pilot heard an audio warning signal and noticed the illumination of the red low oil pressure "ENG P" warning light. The pilot confirmed an oil pressure level of 0.1 bar on the VEMD and initiated an autorotation procedure while keeping the engine lever in the "flight" detent. Then the engine shut-down occurred during flare, during the final phase of landing. The pilot performed autorotation with no additional consequence. This engine shut-down was caused by damage to the Gas Generator front bearing which resulted in rotating assembly seizure. The bearing was examined and it was determined that the bearing damage was due to a loss of lubrication. Further investigations conducted on the engine did not reveal the cause of the loss of lubrication to be found. The purpose of this Service Letter is to remind you that, following illumination of the "ENG P" warning light, the EUROCOPTER EC120 B Flight Manual requires immediate initiation of the autorotation procedure as soon as the engine oil pressure level is confirmed as low or nil. This autorotation procedure necessitates engine shut-down. This requirement is related to the velocity and extent of the engine damage once lubrication is interrupted. Please contact us if you require further information or assistance. J-S. VIGNES Technical Support Department SIEGE SOCIAL ET DIRECTION GENEMLE : 645'11 Bordes Cedex - France 16l. (33) 5 59 12 50 00 -Telex 560 928 - Fax (33) 5 59 53 15 12 Brevets Szydlowski - TURBOMECA Soci6t6 Anonyme au capital de 38.553.056 Eu.os - Registre du Commerce et des Soci6tes Pau B 338 481 955 Quote Link to comment Share on other sites More sharing options...
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