Airworthiness Directive · Amendment 39-21653 · Tail rotor drive
Bell Textron Canada Limited (Type Certificate Previously Held by Bell Helicopter Textron Canada Limited)
This AD applies to the following Bell Textron Canada Limited (type certificate previously held by Bell Helicopter Textron Canada Limited) helicopters, certificated in any category:
(1) Model 206A, serial numbers 004 through 660 inclusive, and 672 through 715 inclusive;
(2) Model 206B, all serial numbers, including those converted from Model 206A;
(3) Model 206L, serial numbers 45004 through 45153 inclusive, and 46601 through 46617 inclusive;
(4) Model 206L-1, serial numbers 45154 through 45790 inclusive;
(5) Model 206L-3, serial numbers 51001 through 51612 inclusive; and
(6) Model 206L-4, all serial numbers.
The FAA is adopting a new airworthiness directive (AD) for certain Bell Helicopter Textron Canada Limited (now Bell Textron Canada Limited) Model 206A, 206B, 206L, 206L-1, 206L-3, and 206L-4 helicopters. This AD was prompted by a report that a certain tail rotor disc assembly, sold as an alternate part, does not conform to the approved configuration. This AD requires determining if an affected part is installed (by doing a maintenance records check or inspection), and if an affected part is found, replacement with a non-affected part. The FAA is issuing this AD to address the unsafe condition on these products.
Do the actions specified in paragraphs (g)(1) through (4) of this AD, in accordance with Bell Helicopter Alert Service Bulletin 206-09-123, Revision A, dated June 10, 2009; or Bell Helicopter Alert Service Bulletin 206L-09-157, Revision A, dated June 10, 2009, as applicable.
(1) Within 30 days or 100 hours time-in-service (TIS) after the effective date of this AD, whichever occurs first, review the helicopter maintenance records to determine if a disc assembly, part number (P/N) 101584-1 or -2, is installed.
(2) If, during the maintenance records review required by paragraph (g)(1) of this AD, you cannot positively determine that disc assembly P/N 101584-1 or -2 is not installed, within 30 days or 100 hours TIS after the effective date of this AD, whichever occurs first, inspect the tail rotor driveshaft system to determine if disc assembly P/N 101584-1 or -2 is installed.
(3) If, during the maintenance records review required by paragraph (g)(1) of the this AD or during the inspection required by paragraph (g)(2) of this AD, you can positively determine that a disc assembly P/N 101584-1 or -2 is not installed, before further flight, make an entry in the log book showing compliance with this AD.
(4) If, during the maintenance records review required by paragraph (g)(1) of this AD or during the inspection required by paragraph (g)(2) of this AD, you can positively determine that a disc assembly P/N 101584-1 or -2 is installed, within 30 days or 100 hours TIS after the effective date of this AD, whichever occurs first, replace disc assembly P/N 101584-1 or -2 with disc assembly P/N 32721-1.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
