Airworthiness Directive · Amendment 39-17576 · Ignition power supply
Bell Helicopter Textron Canada Inc. Helicopters
This AD applies to the following helicopters, certificated in any category:
(1) BHT Model 206A and 206B helicopters, all serial numbers (S/N) except S/Ns 1, 2, and 3, with an engine auto-relight kit control box assembly (control box assembly) part number (P/N) 206-375-017-101 installed; and
(2) BHT Model 206L helicopters, S/N 45001 through 45153 and 46601 through 46617, with a control box assembly P/N 206-375-017-103 installed.
We are adopting a new airworthiness directive (AD) for certain Bell Helicopter Textron Canada Inc. (BHT) Model 206A, 206B, and 206L helicopters. This AD requires replacing certain part-numbered engine auto-relight kit control boxes. This AD was prompted by a design review that revealed the control box chipset did not meet the required temperature range requirements, which could cause the control box to malfunction, disabling the engine auto-relight system. The actions of this AD are intended to prevent a disabled auto-relight system, failure of the engine to relight after a flame-out, increased pilot workload during a power loss emergency, and subsequent loss of control of the helicopter.
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 4 months, replace the control box assembly:
(1) For Model 206A and 206B helicopters, replace control box assembly P/N 206-375-017-101 with a control box assembly P/N 206-375-017-105.
(2) For Model 206L helicopters, replace control box assembly P/N 206-375-017-103 with a control box assembly P/N 206-375-017-107.
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.
