Airworthiness directives › 2013-02-01
AD 2013-02-01 Airworthiness Directives; Bell Helicopter Textron Canada Limited (Bell) Helicopters
Applicability*9
This AD becomes effective February 7, 2013.
Compliance
(1) The Manager, Safety Management Group, FAA, may approve AMOCs for this AD. Send your proposal to: Matt Wilbanks, Aviation Safety Engineer, Rotorcraft Certification Office, Rotorcraft Directorate, FAA, 2601 Meacham Blvd., Fort Worth, Texas 76137; telephone (817) 222-5110; email matt.wilbanks@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 AD CF-2011-19R1, Revision 1, dated December 7, 2011.
Unsafe condition
Before further flight, for each servo: (1) Retract the boot as depicted in Figure 1 of Bell Alert Service Bulletin (ASB) No. 206L-11-169, Revision B, dated August 29, 2011 (ASB). (2) Applying only hand pressure, determine whether the nut, shaft, and clevis assembly turn independently from each other. (i) If the shaft turns independently of the nut or the clevis assembly, before further flight, replace the servo with an airworthy servo. (ii) If the shaft does not turn independently of the nut or the clevis assembly, inspect to determine whether at least one tab of the lock washer (tab) is aligned with and bent flush against a flat surface of the nut and whether at least one tab is aligned with and bent flush against a flat surface of the clevis assembly. (A) If at least one tab is aligned with and bent flush against a nut flat surface and at least one tab is aligned with and bent flush against a flat surface of the clevis assembly, for any tab that is not bent flush against either a flat surface of the nut or clevis assembly, bend it flush against a flat surface. (B) If at least one tab is not aligned with and bent flush against a nut flat surface and at least one tab is not aligned with and bent flush against a flat surface of the clevis assembly, before further flight, replace the servo with an airworthy servo. (3) Re-identify the servo by metal-impression stamping or by vibro-etching the letter “V” at the end of P/N 206-076-062-103V on the identification plate.
Affected ADs
This AD defines the unsafe condition as loose or misaligned parts of the servo. This condition could result in failure of the servo and subsequent loss of control of the helicopter.
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