| 2018-16-14 | Bell Helicopter Textron Inc., Helicopters | Oct 4, 2018 | Airframe (412EP)Only with: Emergency flotation system (EFS) tube assembly P/N 412-073-820-101 with a date of manufacture before July 28, 2016, or an unknown date of manufacture installed. |
| 2013-20-18 | Bell Helicopter Textron, Inc. (Bell) Helicopters | Nov 29, 2013 | Airframe (412EP)Only with: Main rotor yoke assembly P/N 412-010-101-123, -127, -129, or -133 installed (Models 412/412EP); P/N 412-010-101-127 or -129 installed (Model 412CF). |
| 2013-16-16 | Agusta S.p.A. and Bell Helicopter Textron Helicopters | Sep 17, 2013 | Airframe (412EP)Only with: DART Aerospace Ltd. high gear aft crosstube P/N D412-664-203 installed under STC No. SR01298NY. |
| 2013-15-02 | Bell Helicopter Textron Helicopters | Aug 14, 2013 | Airframe (412EP)Only with: Tail rotor blade assembly P/N 210-010-001-(all dash numbers) or 212-010-750-(all dash numbers) installed. |
| 2013-05-14 | Bell Helicopter Textron, Inc. | Apr 26, 2013 | Airframe (412EP)Only with: Swashplate outer ring assembly P/N 412-010-407-105 installed. |
| 2012-22-11 | Bell Helicopter Textron Helicopters | Dec 20, 2012 | Airframe (412EP)Certain serial numbers: 412 33001–33213; 412 34001–34036; 412 36001–on; 412EP 33001–33213; 412EP 34001–34036; 412EP 36001–on; …. Only with: With a collective lever P/N 412-010-408-101 installed. |
| 2012-22-06 | Aeronautical Accessories, Inc., High Landing Gear Forward Crosstube Assembly | Dec 14, 2012 | Airframe (412EP)Only with: Aeronautical Accessories, Inc. high landing gear forward crosstube assembly P/N 212-321-103 installed |
| 2012-11-13 | Aeronautical Accessories, Inc., High Landing Gear Aft Crosstube Assembly | Jul 30, 2012 | Airframe (412EP)Only with: Aeronautical Accessories, Inc. High Landing Gear Aft Crosstube Assembly P/N 412-321-104 or P/N 412-321-304 installed. |
| 2011-12-08 | Bell Helicopter Textron, Inc. Model 205A, 205A-1, 205B, 212, 412, 412CF, and 412EP… | Jul 5, 2011 | Airframe (412EP)Only with: Tail rotor blade P/N 212-010-750 (all dash numbers) installed, all blade S/Ns except those with prefix "A" and number 17061 or larger. |
| 2010-10-16 | Bell Helicopter Textron (Bell) Model 205A, 205A-1, 205B, 212, 412, 412EP, and 412CF and… | Jun 8, 2010 | Airframe (412EP)Only with: AAI Low Skid Landing Gear Forward Crosstube P/N 212-320-103 with S/N prefix "AA" and S/N 574 through 628 installed. |
| 2007-19-53 | Bell Helicopter Textron, Inc. Model 204B, 205A, 205A-1, 205B, 210, 212, 412, 412EP, and… | Dec 5, 2007 | Airframe (412EP)Only with: Applies only with a tail rotor blade installed having one of these P/N and S/N: 204-011-702-015 (AFS-12703, AFS-12893, AFS-23525, AFS-23573); 204-011-702-121 (A-22020); 212-010-750-105FM (A-10090, A-10836, A-11207, A-11332); 212-010-750-113 (A-14953, A15090, CS-12702); 212-010-750-113FM (A-12240, A-12296, A-12640, A-12670, A-12789, A-13033, A-13096, A-13134, A-13199, A-13264, A-13366); 212-010-750-133 (A15602). |
| 2002-09-04 | Bell Helicopter Textron, Inc. Model 205A, 205A-1, 205B, 212, 412, 412EP, and 412CF… | Jun 7, 2002 | Airframe (412EP)Only with: Tail rotor blade P/N 212-010-750-009, -011, -105, -107, -109, or -111 installed, with blade S/N prefix ATR or A3, or prefix A with number less than or equal to 11529. |
| 2001-13-01 | Bell Helicopter Textron, Inc. Model 205A-1, 205B, 212, 412, 412EP, and 412CF Helicopters | Aug 1, 2001 | Airframe (412EP) |
| 2001-09-11 | Bell Helicopter Textron, Inc. Model 412 Helicopters and Agusta S.p.A. Model AB412… | Jun 11, 2001 | Airframe (412EP)Only with: Tail rotor yoke assembly P/N 212-011-702 (all dash numbers) installed. |
| 99-23-23 | Bell Helicopter Textron, Inc. Model 412, 412EP and 412CF Helicopters | Dec 1, 1999 | Airframe (412EP)Certain serial numbers: 412 33001–33213; 412 34001–34036; 412 36001–36204; 412EP 33001–33213; 412EP 34001–34036; 412EP 36001–36204; …. Only with: Main rotor yoke assembly P/N 412-010-101-123 or 412-010-101-127 installed. |
| 97-11-04 | Bell Helicopter Textron, Inc. Model 412 and 412EP Helicopters | May 20, 1997 | Airframe (412EP)Only with: Main rotor mast P/N 412-040-101-105, -109, -117, -121, -125, -127, or -129 and main rotor spline plate P/N 412-010-167-105 or 412-010-177-101, -105, -109, -113, or -117 installed. |