Airworthiness directives › 2007-19-09
AD 2007-19-09 Airworthiness Directives; Turbomeca Arriel 2B1 Turboshaft Engines
Applicability*9
This AD applies to Turbomeca Arriel 2B1 turboshaft engines. These engines are installed on, but not limited to, Eurocopter AS 350 B3 and EC 130 B4 helicopters. Reason (d) European Aviation Safety Agency (EASA) AD No. 2007-0126, dated May 7, 2007, states: This AD is prompted by several reported cases of rupture of the constant delta pressure valve diaphragm on Arriel 2B1 engines, due to the wear of the delta P diaphragm fabric. Rupture can result in the loss of the automatic control mode of the helicopter, accompanied with a deterioration of the behavior of the auxiliary back-up mode (emergency mode). On a single-engine helicopter, the result may be an emergency landing or, at worst, an accident. This AD supersedes EASA AD 2007-0006 which required the removal from service of all the delta pressure valve diaphragms logging more than 2,000 hours-since-new. Since issuance of EASA AD 2007-0006, no further case of rupture of the constant delta pressure valve diaphragm has been reported on Arriel 2 engines. However, about 40 additional diaphragms returning from service have been inspected by Turbomeca, and some signs of wear have been detected on diaphragms having logged less than 2,000 hours. Based on the inspection results, it has been decided to decrease this limit from 2,000 hours to 1,500 hours in order to further reduce the probability of delta P diaphragm rupture. The loss of automatic control mode coupled with the deteriorated performance of the backup mode can lead to the inability to continue safe flight, forced autorotation landing, or an accident.
Compliance
Unless already done, do the following actions. (1) Replace the HMU with a serviceable HMU before the HMU accumulates 1,500 hours-since-new, since-last-overhaul, or since-incorporation of Turbomeca Service Bulletin (SB) No. 292 73 2105; or by July 30, 2007, whichever occurs later. (2) Thereafter, replace HMUs with a serviceable HMU at every 1,500 hours-since-new, since-last-overhaul, or since-incorporation of Turbomeca SB No. 292 73 2105, whichever occurs later. (3) For the purposes of this AD, a serviceable HMU is an HMU fitted with a new constant delta P diaphragm in accordance with Turbomeca Service Bulletin (MSB) No. 292 73 2818, Original Issue, dated October 18, 2006, or Update No. 1, dated April 3, 2007. Other FAA AD Provisions (f) Alternative Methods of Compliance (AMOCs): The Manager, Engine Certification Office, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Related Information (g) Contact Christopher Spinney, Aerospace Engineer, Engine Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; e-mail: christopher.spinney@faa.gov; telephone (781) 238-7175, fax (781) 238-7199, for more information about this AD. Material Incorporated by Reference (h) None. Issued in Burlington, Massachusetts, on September 11, 2007. Francis A. Favara, Manager, Engine and Propeller Directorate, Aircraft Certification Service. [FR Doc. E7-18337 Filed 9-17-07; 8:45 am] BILLING CODE 4910-13-P
Required actions
Unless already done, do the following actions. (1) Replace the HMU with a serviceable HMU before the HMU accumulates 1,500 hours-since-new, since-last-overhaul, or since-incorporation of Turbomeca Service Bulletin (SB) No. 292 73 2105; or by July 30, 2007, whichever occurs later. (2) Thereafter, replace HMUs with a serviceable HMU at every 1,500 hours-since-new, since-last-overhaul, or since-incorporation of Turbomeca SB No. 292 73 2105, whichever occurs later. (3) For the purposes of this AD, a serviceable HMU is an HMU fitted with a new constant delta P diaphragm in accordance with Turbomeca Service Bulletin (MSB) No. 292 73 2818, Original Issue, dated October 18, 2006, or Update No. 1, dated April 3, 2007. Other FAA AD Provisions (f) Alternative Methods of Compliance (AMOCs): The Manager, Engine Certification Office, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Related Information (g) Contact Christopher Spinney, Aerospace Engineer, Engine Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; e-mail: christopher.spinney@faa.gov; telephone (781) 238-7175, fax (781) 238-7199, for more information about this AD. Material Incorporated by Reference (h) None. Issued in Burlington, Massachusetts, on September 11, 2007. Francis A. Favara, Manager, Engine and Propeller Directorate, Aircraft Certification Service. [FR Doc. E7-18337 Filed 9-17-07; 8:45 am] BILLING CODE 4910-13-P
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