Airworthiness Directive · Amendment 39-10187 · Raytheon Aircraft Company Models 1900, 1900C, and 1900D Airplanes
Raytheon Aircraft Company Models 1900, 1900C, and 1900D Airplanes
Superseded. A later AD replaced this one: AD 2004-01-13. Comply with the one in force.
The following model and serial number airplanes, certificated in any category, that are equipped with either part number (P/N) 114-380028-1 vent blower assemblies or P/N 114-380028-3 vent blower assemblies: Model Serial numbers 1900.................................. UA-2 and UA-3. 1900C................................. UB-1 through UB-74, and UC-1 through UC-174. 1900C (C-12J)......................... UD-1 through UD-6. 1900D................................. UE-1 through UE-244.
This amendment adopts a new airworthiness directive (AD) that applies to certain Raytheon Aircraft Company (Raytheon) Models 1900, 1900C, and 1900D airplanes (formerly referred to as Beech Models 1900, 1900C, and 1900D airplanes). This AD requires fabricating and installing a placard that restricts the use of the forward and aft vent blower assemblies to only the ``OFF'' or ``HIGH'' position. This AD also requires incorporating a modification that would replace the bearings on the vent blower assemblies with improved design bearings, and provide thermal protection for the vent blowers, as applicable. Incorporating the modification will eliminate the need for the placard. The AD results from reports of vent blower assembly bearings seizing and locking the blower motor on several of the affected airplanes. The actions specified by this AD are intended to prevent the vent blower assembly bearings from seizing, which could result in smoke emanating from the insulating material covering the electrical wiring and entering the airplane cabin.
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.
