Airworthiness directives › 2013-11-05
AD 2013-11-05 Airworthiness Directives; Bell Helicopter Textron, Inc. (Bell) Helicopters
Applicability*9
This AD becomes effective June 19, 2013.
Compliance
Special flight permits are prohibited.
Required actions
(1) The Manager, Rotorcraft Certification Office, FAA, may approve AMOCs for this AD. Send your proposal to: James Blyn, Aviation Safety Engineer, Rotorcraft Certification Office, Rotorcraft Directorate, FAA, 2601 Meacham Blvd., Fort Worth, Texas 76137; telephone (817) 222-5762; email 7-AVS-ASW-170@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.
Unsafe condition
(1) Within 10 hours time in service (TIS): (i) Inspect each bearing to determine whether the seal material is correct, as described in the Accomplishment Instructions, Part 1—Inspection, paragraphs 1.a. through 2. and Figure 1 of Bell Alert Service Bulletin (ASB) 214-13-74, Revision A, dated March 25, 2013, for Model 214B and 214B-1 helicopters and ASB 214ST-13-90, Revision A, dated March 25, 2013, for Model 214ST helicopters. (ii) For each bearing with black seal material, before further flight and thereafter at intervals not to exceed 10 hours TIS, inspect the bearing for leakage, slung grease, or damage. If there is any leakage, slung grease, or damage, before further flight, replace the bearing with an airworthy bearing with red/orange to brown color seal material. (2) Replacing a bearing with an airworthy bearing with the correct red/orange to brown color seal material terminates the inspection requirements of this AD. (3) Do not install bearing P/N 214-040-606-005 or 214-040-606-101 with black seal material on any helicopter.
Affected ADs
This AD defines the unsafe condition as a bearing with incorrect seal material, which could fail under extreme temperature or environmental conditions, resulting in loss of tail rotor control and subsequent loss of control of the helicopter.
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