Airworthiness Directive · Amendment 39-21674 · Instrument panel
Bell Textron Canada Limited Helicopters
This AD applies to Bell Textron Canada Limited Model 505 helicopters, certificated in any category, with serial numbers (S/Ns) 65011 through 65023 inclusive, 65025 through 65028 inclusive, 65030 through 65032 inclusive, 65034, and 65036 with relay panel assembly part number (P/N) SLS-075-002-107 installed.
Note 1 to paragraph (c): Helicopters with S/Ns 65011 through 65023 inclusive, 65025 through 65028 inclusive, 65030 through 65032 inclusive, 65034, and 65036 are known to have had relay panel assembly P/N SLS-075-002-107 installed during production.
The FAA is adopting a new airworthiness directive (AD) for certain Bell Textron Canada Limited Model 505 helicopters. This AD was prompted by three occurrences of metallic debris in the engine oil lubrication system causing the 12 volts direct current (VDC) reference voltage to be shorted to ground and loss of important flight information to the pilot. This AD requires replacing a certain part- numbered relay panel assembly. The FAA is issuing this AD to address the unsafe condition on these products.
(1) Within 25 hours time-in-service after the effective date of this AD, replace relay panel assembly P/N SLS-075-002-107 with relay panel assembly P/N SLS-075-002-109 by following the Accomplishment Instructions, paragraphs 1.a. through 3, of Bell Helicopter Alert Service Bulletin 505-17-04, dated December 6, 2017.
(2) As of the effective date of this AD, do not install relay panel assembly P/N SLS-075-002-107 on any helicopter.
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.
