| 2006-21-02 | Raytheon (Beech) Model 400, 400A, and 400T Series Airplanes; and Raytheon (Mitsubishi)… | Oct 25, 2006 | Airframe (400A) |
| 2006-15-16 | Raytheon (Beech) Model 400 and 400A Series Airplanes | Sep 5, 2006 | Airframe (400A)Certain serial numbers: 400 RJ-1–RJ-65; 400A RK-1–RK-23. Only with: Kit P/N 128-3004-1 P or 128-3004-3 P (Lucas Aerospace/Goodrich DC Starter Generator) has been incorporated. |
| 2004-04-09 | Pratt & Whitney Canada JT15D-1, -1A, and -1B Turbofan Engines | Apr 5, 2004 | Engine (JT15D-1)Only with: Engines with certain impellers, P/N 3020365, installed. |
| 2004-03-35 | Raytheon Model Beech 400A and 400T Series Airplanes | Mar 24, 2004 | Airframe (400A)Certain serial numbers: 400A RK-45; 400A RK-49–RK-322; 400T TT-1–TT-180; 400T TX-1–TX-12 |
| 2003-10-13 | Raytheon Model Beech 400A and 400T Series Airplanes | Jul 1, 2003 | Airframe (400A)Certain serial numbers: 400A RK-232–RK-265; 400T TX-10 |
| 2002-01-23 | Raytheon Model Beech 400, 400A, and 400T Series Airplanes; Model Beech MU-300-10… | Feb 14, 2002 | Airframe (400A)Certain serial numbers: 400 RJ-1–RJ-65; 400A RK-1–on; 400T TT-1–TT-180; 400T-1 TX-1–TX-11; MU-300-10 A1001SA–A1011SA; MU-300 A003SA–A091SA |
| 2001-24-11 | Raytheon Model Beech 400, 400A, and 400T Series Airplanes, Model Mitsubishi MU-300… | Dec 11, 2001 | Airframe (400A) |
| 2001-20-07 | Raytheon Model Beech 400A Series Airplanes | Nov 15, 2001 | Airframe (400A)Certain serial numbers: 400A RK-78; 400A RK-87–RK-207 |
| 2000-09-12 | Raytheon (Beech) Model 400A and 400T Series Airplanes | Jun 16, 2000 | Airframe (400A)Certain serial numbers: 400A RK-01–RK-188; 400T TT-01–TT-180; 400T TX-01–TX-09 |
| 99-21-26 | Raytheon (Beech) Model 400, 400A, 400T, and MU-300-10 Airplanes | Nov 22, 1999 | Airframe (400A)Certain serial numbers: 400A RK-1–RK-107 |
| 99-21-08 | Raytheon (Beech) Model 400A Airplanes | Nov 12, 1999 | Airframe (400A)Certain serial numbers: 400A RK-1–RK-92 |
| 98-06-30 | Raytheon (Beech) Model 400, 400A, 400T, MU-300, and MU-300-10 Airplanes | Apr 24, 1998 | Airframe (400A)Serial numbers per AlliedSignal Aerospace Service Bulletin 103570-21-4012, Revision 1. Only with: Equipped with AlliedSignal outflow/safety valves identified in AlliedSignal Aerospace Service Bulletin 103570-21-4012, Revision 1. |
| 96-25-03 | Raytheon (Beech) Model 400A, 400T (Military T-1A), and 400T (Military TX) Series Airplanes | Jan 24, 1997 | Airframe (400A)Serial numbers per Beech Service Bulletin No. 2522, dated January 1994, and Raytheon Service Bulletin No. 2522, Revision 1, dated May 1996 |