Airworthiness directives › 2012-23-02
AD 2012-23-02 Airworthiness Directives; Agusta S.p.A. Helicopters
Applicability*9
This AD becomes effective January 16, 2013.
Compliance
(1) The Manager, Safety Management Group, FAA, may approve AMOCs for this AD. Send your proposal to: Jim Grigg, Manager, Safety Management Group, Rotorcraft Directorate, FAA, 2601 Meacham Blvd., Fort Worth, Texas 76137; telephone (817) 222-5110; email jim.grigg@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
The subject of this AD is addressed in the European Aviation Safety Agency Emergency AD No. 2007-0192-E, dated July 13, 2007
Unsafe condition
Within 50 hours time-in-service: (1) Inspect the left-side and right-side lower semichannel assemblies by referring to Figures 1 and 2, and in accordance with Paragraph 3. of the Compliance Instructions in the Agusta Bollettino Tecnico (BT) No. 109EP-79 for the Model A109E helicopter, or BT No. 109S-15 for the Model A109S helicopter, both dated July 12, 2007, to determine if metallic spacers, P/N 109-0642-01-195, are installed. If metallic spacers are not installed, no further actions are required. (2) For each semichannel assembly with a metallic spacer, remove the semichannel assembly from the helicopter firewall and note whether it is the left-side or right-side semichannel assembly. (3) Inspect each removed semichannel assembly and determine whether there is a fixing rivet, P/N MS20427M3-5, MS20426T3-5, or A298A04TW02, installed that holds the spacer to the lower semichannel assembly and whether the gasket is properly seated. (4) For each semichannel assembly without a fixing rivet on each side of the lower semichannel assembly or those where the gasket is improperly seated, separate the lower semichannel from the upper semichannel, noting the orientation of each spacer and gasket. Modify the lower semichannel assembly by installing a fixing rivet on each side of the lower semichannel assembly, and reattaching the lower and upper semichannel assemblies in accordance with paragraphs 4.2 through 4.7 of the appropriate BT for your model helicopter. Paragraph 4.2 of the BT states “remove the fixing rivets”; this AD changes that provision to “remove the screws, P/N MS27039-08-05.” (5) Inspect each main drive shaft for a nick, a scratch, or other damage in the semichannel area. If a nick, a scratch, or other damage is found that exceeds those allowable damage tolerances in the maintenance manual, replace the main drive shaft with an airworthy main drive shaft.
Affected ADs
This AD defines the unsafe condition as missing spacer rivets, which could allow the metallic spacers to rotate and lead to damage and failure of the main drive shaft, and subsequent loss of control of the helicopter.
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