AD 2007-05-20 Airworthiness Directives; Microturbo Saphir 20 Models 095 Auxiliary Power Units (APU)

This AD applies to Microturbo Saphir 20 Models 095 Auxiliary Power Units (APU) installed on, but not limited to, Eurocopter AS 332C, AS 332L, AS 332L1, and AS 332L2 helicopters. Reason (d) Direction Generale De l'Aviation Civile Airworthiness Directive F-2005-146, dated August 17, 2005, states: It has been reported that with the existing configuration, a certain failure could cause overspeed of the gas generator rotor resulting in uncontained burst of the turbine liberating high-energy fragments. The occurrence that the high-energy fragments would be uncontained is considered a potentially dangerous situation which requires imperative corrective action. The purpose of the modification, which has been made mandatory, is to limit gas generator speed during an acceleration towards overspeed by installation of a modified Electronic Control Unit (ECU) and Drain Valve. In addition, the modification also renders the exhaust gas temperature (EGT) control function compliant with the certificated specifications. In operation, if EGT exceeds the certificated limit value, turbine blade shedding could occur.

Unless already done, do the following actions except as stated in paragraph (f) below. (1) Within 60 days after the effective date of this AD, replace the existing ECU and drain valve. (2) Follow paragraph 2. of Accomplishment Instructions of Microturbo Alert Service Bulletin (ASB) No. 095-49A11, Edition 2, dated October 7, 2005, to do these actions. FAA AD Differences (f) This AD differs from the mandatory continuing airworthiness information (MCAI) and/ or service information as follows: (1) The MCAI issued by an airworthiness authority of another country refers to Microturbo ASB No. 095-49A11, dated July 27, 2005. (2) This AD refers to Edition 2 of that ASB, dated October 7, 2005, which contains revised torque values. Other FAA AD Provisions (g) The following provisions also apply to this AD: (1) Alternative Methods of Compliance (AMOCs): The Manager, Boston Aircraft Certification Office, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. (2) Airworthy Product: For any requirement in this AD to obtain corrective actions from a manufacturer or other source, use these actions if they are FAA-approved. Corrective actions are considered FAA-approved if they are approved by the State of Design Authority (or their delegated agent). You are required to assure the product is airworthy before it is returned to service. (3) Reporting Requirements: None. Related Information (h) France AD No. F-2005-146, dated August 17, 2005, also pertains to the subject of this AD. (i) Contact Tracy Murphy, Aerospace Engineer, Boston Aircraft Certification Office, FAA, Engine & Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; telephone (781) 238-7172; fax (781) 238-7170, for more information about this AD. Material Incorporated by Reference (j) You must use Microturbo Alert Service Bulletin No. 095-49A11, Edition 2, dated October 7, 2005 to do the actions required by this AD, unless the AD specifies otherwise. (1) The Director of the Federal Register approved the incorporation by reference of this service information under 5 U.S.C. 552(a) and 1 CFR part 51. (2) For service information identified in this AD, contact Microturbo SA; Technical Publications Department; 8 Chemin du pont de Rupe, BP 62089; 31019 Toulouse Cedex 2, France; telephone 33 0 5 61 37 55 00; fax 33 0 5 61 70 74 45. (3) You may review copies at the FAA, New England Region, Office of the Regional Counsel, 12 New England Executive Park, Burlington, MA; or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call (202) 741-6030, or go to: http://www.archives.gov/federal-register/cfr/ibr-locations.html. Issued in Burlington, Massachusetts, on March 2, 2007. Robert J. Ganley, Acting Manager, Engine and Propeller Directorate, Aircraft Certification Service. [FR Doc. E7-4140 Filed 3-9-07; 8:45 am] BILLING CODE 4910-13-P

Unless already done, do the following actions except as stated in paragraph (f) below. (1) Within 60 days after the effective date of this AD, replace the existing ECU and drain valve. (2) Follow paragraph 2. of Accomplishment Instructions of Microturbo Alert Service Bulletin (ASB) No. 095-49A11, Edition 2, dated October 7, 2005, to do these actions. FAA AD Differences (f) This AD differs from the mandatory continuing airworthiness information (MCAI) and/ or service information as follows: (1) The MCAI issued by an airworthiness authority of another country refers to Microturbo ASB No. 095-49A11, dated July 27, 2005. (2) This AD refers to Edition 2 of that ASB, dated October 7, 2005, which contains revised torque values. Other FAA AD Provisions (g) The following provisions also apply to this AD: (1) Alternative Methods of Compliance (AMOCs): The Manager, Boston Aircraft Certification Office, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. (2) Airworthy Product: For any requirement in this AD to obtain corrective actions from a manufacturer or other source, use these actions if they are FAA-approved. Corrective actions are considered FAA-approved if they are approved by the State of Design Authority (or their delegated agent). You are required to assure the product is airworthy before it is returned to service. (3) Reporting Requirements: None. Related Information (h) France AD No. F-2005-146, dated August 17, 2005, also pertains to the subject of this AD. (i) Contact Tracy Murphy, Aerospace Engineer, Boston Aircraft Certification Office, FAA, Engine & Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; telephone (781) 238-7172; fax (781) 238-7170, for more information about this AD. Material Incorporated by Reference (j) You must use Microturbo Alert Service Bulletin No. 095-49A11, Edition 2, dated October 7, 2005 to do the actions required by this AD, unless the AD specifies otherwise. (1) The Director of the Federal Register approved the incorporation by reference of this service information under 5 U.S.C. 552(a) and 1 CFR part 51. (2) For service information identified in this AD, contact Microturbo SA; Technical Publications Department; 8 Chemin du pont de Rupe, BP 62089; 31019 Toulouse Cedex 2, France; telephone 33 0 5 61 37 55 00; fax 33 0 5 61 70 74 45. (3) You may review copies at the FAA, New England Region, Office of the Regional Counsel, 12 New England Executive Park, Burlington, MA; or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call (202) 741-6030, or go to: http://www.archives.gov/federal-register/cfr/ibr-locations.html. Issued in Burlington, Massachusetts, on March 2, 2007. Robert J. Ganley, Acting Manager, Engine and Propeller Directorate, Aircraft Certification Service. [FR Doc. E7-4140 Filed 3-9-07; 8:45 am] BILLING CODE 4910-13-P