Airworthiness Directive · Amendment 39-17423 · Air data computer
Bell Helicopter Textron Canada (Bell) Helicopters
This AD applies to Model 430 helicopters: serial number (S/N) 49001 through 49103, with Overspeed Warning Kit, part number (P/N) 430-706-004-101 or P/N 430-706-004-103, installed; S/N 49001 through 49100, with Single Automatic Flight Control System (AFCS) with Flight Director Kit, P/N 430-705-009-103, -105, -109, -111, -115, -117, or P/N 430-705-011-109, -111, -121, or -123, installed; and S/N 49001 through 49100, with Dual AFCS with Flight Director Kit, P/N 430-705-011-103, -105, -115, -117, -125, -127, -129, -133, -135, or -137, installed, certificated in any category.
We are adopting a new airworthiness directive (AD) for Bell Model 430 helicopters, which requires replacing certain components of the air data system. This AD was prompted by the discovery of incorrect indicated airspeed when the helicopter was tested to the cold temperature limits (-40 degrees centigrade) required for Category A operations. The actions of this AD are intended to correct the published Vne and to correct the indicated airspeed.
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 1 year:
(1) For helicopters with an Overspeed Warning System, replace the Overspeed Warning Computer, P/N 430-375-013-103, with the Overspeed Warning Computer, P/N 430-375-013-105; the V ne Converter, P/N ADI-21280-000, with the V ne Converter, P/N ADI-21280-100; and the pilot and copilot Airspeed Indicator, P/N 222-375-027-117, with the pilot and copilot airspeed Indicator, P/N 222-375-027-119;
(i) If installed, remove the decal, P/N 430-075-070-103, from below the pilot and copilot airspeed indicators;
(ii) Leak test the pilot pitot static system; and
(iii) Operationally test the overspeed warning system.
(2) For helicopters with a Single or Dual AFCS with a Flight Director, replace the AFCS Air Data Computer Adapter Module, P/N 065-05041-0021, with P/N 065-05041-0031;
(i) If installed, remove the decal, P/N 430-075-070-101, from above the pilot and copilot electronic attitude direction indicators airspeed indicators;
(ii) Leak test the pilot pitot static system;
(iii) Power-up test the altimeter/vertical speed indicator (ALT/VSI) and self-test the ALT/VSI of the AFCS air data computer.
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.
