Airworthiness Directive · Amendment 39-18814 · Tension torsion strap
Bell Helicopter Textron Canada Limited Helicopters
This AD applies to Bell Helicopter Textron Canada Limited Model 206A, 206B, 206L, 206L1, 206L3, and 206L4 helicopters, certificated in any category, with a tension-torsion strap (TT strap) part number (P/N) 206-011-147-005 with a serial number BTFS-23868 through BTFS-24277 or P/N 206-011-147-007 with a serial number BT-22719 through BT-23437 installed.
We are adopting a new airworthiness directive (AD) for certain Bell Helicopter Textron Canada Limited (BHTC) Model 206 helicopters. This AD requires removing certain tension-torsion straps (TT straps) from service and is prompted by reports of corroded TT straps. These actions are intended to prevent an unsafe condition on these products.
You are responsible for performing each action required by this AD within the specified compliance time unless it has already been accomplished prior to that time.
Within 25 hours time-in-service (TIS), remove from service any TT strap that has 1,000 or more hours TIS or 18 or more months since installation. Thereafter, remove from service any TT strap before accumulating 1,000 hours TIS or 18 months since installation, whichever occurs first.
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.
