AD/BEECH 400/27 - Generator Control Unit (Cth)

AIRWORTHINESS DIRECTIVE For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.001(1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

Beechcraft 400 Series Aeroplanes AD/BEECH 400/27 Generator Control Unit 10/2006

Applicability: Raytheon (Beech) Model aeroplanes as follows: 400 series, with serial numbers (S/N) RJ-1 through RJ-65 inclusive, on which kit part number (P/N) 128-3004-1 P or 128-3004-3 P has been incorporated (Lucas Aerospace/Goodrich Direct Current (DC) Starter Generator). 400A series, with S/N RK-1 through RK-23 inclusive, on which kit P/N 128-3004-1 P or 128-3004-3 P has been incorporated (Lucas Aerospace/Goodrich DC Starter Generator). Requirement: 1. Review the aeroplane logbook, in accordance with the Accomplishment instructions of Raytheon Service Bulletin (SB) SB 24-3713, dated November 2005, to determine whether generator control unit (GCU) installation kit, P/N 128-3001-1 P or 128-3001-3 P, is installed. 2. If, as a result of the Requirement 1 determination, a GCU installation kit P/N 128-3001-1 P or 128-3001-3 P is not found to be installed or if the kit P/N cannot be conclusively determined, replace the Shinko GCUs with new Lucas Aerospace/Goodrich GCUs (installation kit P/N 128-3001-1 P or 128-3001-3 P), in accordance with SB 24-3713. 3. If, as a result of the Requirement 1 determination, any GCU installation kit, P/N 128-3001-1 P or 128-3001-3 P is found installed, inspect to determine the P/ N of both GCUs, in accordance with SB 24-3713 and carry out Requirement 4 or 5 as applicable. 4. Both GCUs have P/N 45AS88801-19 or -25 - Inspect to determine the P/N of both current sense transformers on the lower inboard quadrant of the left-hand and right-hand engine inlets, in accordance with SB 24-3713. a. If both current sense transformers have P/N 45AS88801-21, no further action is required by this Directive. b. If either current sense transformer is not identified with P/N 45AS88801-21, replace the current sense transformer with a new transformer, P/N 45AS88801-21, in accordance with SB 24-3713.