Airworthiness directives › 2013-22-01
AD 2013-22-01 Airworthiness Directives; Bell Helicopter Textron Canada (Bell) Helicopters
Applicability*9
This AD becomes effective December 5, 2013.
Compliance
(1) The Manager, Safety Management Group, FAA, may approve AMOCs for this AD. Send your proposal to: Eric Haight, Aviation Safety Engineer, FAA, Rotorcraft Directorate, Regulations and Policy Group, Fort Worth, Texas 76137, telephone (817) 222-5110, email: eric.haight@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 Transport Canada Civil Aviation (TCCA) AD No. CF-2004-17R1, dated February 11, 2005. You may view the TCCA AD at http://www.regulations.gov in Docket No. FAA-2013-0526.
Unsafe condition
Within 50 hours time-in-service (TIS): (1) Remove and disassemble each freewheel assembly. (2) Replace the sprag and retainer (item 7), the output shaft (item 10), and the aft seal (item 3), as depicted in Figure 2 of Bell Alert Service Bulletin (ASB) No. 206L-04-129 for the Model 206L-4 and ASB No. 407-04-66 for the Model 407, both Revision A, and both dated December 1, 2004. (3) Visually inspect the remaining freewheel part details for a missing channel. (4) If the channel is missing, replace or rework the cap assembly by following the instructions depicted in Figure 3 of ASB 206L-04-129 or ASB 407 04-66, as applicable for your model helicopter. Using a vibrating stylus, mark the letter “R” at the end of the serial number on the cap assembly.
Affected ADs
This AD defines the unsafe condition as certain caps being manufactured without a lubrication channel to allow oil flow into the aft bearing support assembly, which could result in failure of the freewheel unit and subsequent loss of control of the helicopter.
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