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Airworthiness directives › 2012-26-10

AD 2012-26-10 Airworthiness Directives; Eurocopter France Helicopters

2013-02-13
2013-01-09
39-17305
FAA-2012-0632
Airframe
—

Applicability*9

This AD becomes effective February 13, 2013.

Compliance

(1) The Manager, Safety Management Group, FAA, may approve AMOCs for this AD. Send your proposal to: Rao Edupuganti, Aviation Safety Engineer, Regulations and Policy Group, Rotorcraft Directorate, FAA, 2601 Meacham Blvd., Fort Worth, Texas 76137; telephone (817) 222-4389; email: rao.edupaganti@faa.gov. (2) For operations conducted under a 14 CFR part 119 operating certificate or under 14 CFR part 91, subpart K, we suggest that you notify your principal inspector, or lacking a principal inspector, the manager of the local flight standards district office or certificate holding district office, before operating any aircraft complying with this AD through an AMOC.

Required actions

(1) Eurocopter Repair Sheet 365-63-36-08, dated April 4, 2008, and Standard Practices Manual (MTC) Work Cards 20.04.04, 20.04.05, and 20.05.01, which are not incorporated by reference, contain additional information regarding the subject of this AD and in particular regarding the procedures for corrosion repair, protective treatment touch-up, and renewing the damaged sealing bead. For service information identified in this AD, contact American Eurocopter Corporation, 2701 Forum Drive, Grand Prairie, Texas 75053-4005, telephone (800) 232-0323, fax (972) 641-3710, or at http://www.eurocopter.com. You may review a copy of the service information at the FAA, Office of the Regional Counsel, Southwest Region, 2601 Meacham Blvd., Room 663, Fort Worth, Texas 76137. (2) The subject of this AD is addressed in European Aviation Safety Agency AD No. 2011-0127, dated July 1, 2011.

Unsafe condition

(1) Within 30 hours time-in-service, inspect the lower parts of the MGB servo-control anchoring fittings (anchor fittings) for sealing compound, referring to Figure 1 of Eurocopter Emergency Alert Service Bulletin No. 63.00.17 (for Models SA-365N, SA-365N1, AS-365N2 and AS 365 N3); No. 63A011 (for Models EC 155B and EC155B1); No. 65.03 (for Model SA-366G1); and No. 65.47 (for Models SA-365C, SA-365C1, and SA-365C2), Revision 0, dated May 7, 2008 (EASB). Note 1 to paragraph (e)(1): The Eurocopter EASB is one document with multiple EASB numbers, each applicable to different base model Eurocopter helicopters. (2) If there is sealing compound on the lower part of an MGB anchor fitting, remove the sealing compound and inspect for corrosion in the lower area of the MGB casing. (i) If there is corrosion, before further flight, repair the corrosion area. (ii) If there is no corrosion, apply touch up protective treatment, if required, and renew the bead of any damaged sealing compound in the upper part of the anchor fitting.

Affected ADs

This AD defines the unsafe condition as corrosion on the main gearbox (MGB) casing lower area between the servo-control anchoring ribs, caused by sealing compound on the lower part of the fitting/casing attachment. This condition could result in a crack, failure of the MGB, and subsequent loss of control of the helicopter.

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