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AD/BEECH 400/27 - Generator Control Unit
Beechcraft 400 Series AeroplanesBeechcraft 400 Series Aeroplanes
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Beechcraft 400 Series Aeroplanes
| AD/BEECH 400/27 | Generator Control Unit | 10/2006 |
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| Applicability: | Raytheon (Beech) Model aeroplanes as follows: |
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| 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. |
| 5. Either GCU does not have P/N 45AS88801-19 or -25 - Replace the GCU with a new GCU, P/N 45AS88801-19 or -25, and inspect to determine the P/N of both current sense transformers on the lower in-board quadrant of the left-hand and right-hand engine inlets, in accordance with SB 24-3713. |
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