| 2012-10-01 | Bell Helicopter Textron Canada Limited Helicopters | Jun 29, 2012 | Airframe (427)Certain serial numbers: 427 56001–56084 |
| 2011-15-51 | Bell Helicopter Textron Canada (Bell) Model 407 and 427 Helicopters | Nov 14, 2011 | Airframe (427)Only with: Model 407 with hydraulic servo actuator assembly P/N 206-076-062-105 or -107 installed; Model 427 with servo P/N 206-076-062-109 or -111 installed. |
| 2010-26-51 | Bell Helicopter Textron Canada Limited (BHTC) Model 206A, 206B, 206L, 206L-1, 206L-3… | Mar 25, 2011 | Airframe (427)Serial numbers per RBI document attached to Bell Helicopter Textron ASBs 206-07-116, 206L-07-148, 222-07-106, 222U-07-77, 230-07-38, 407-07-81, 427-07-18, 430-07-41. Only with: Tail rotor blade with part number and serial number listed in the RBI document attached to the Bell ASBs installed. |
| 2011-03-03 | Bell Helicopter Textron Canada Limited Model 427 Helicopters | Apr 14, 2011 | Airframe (427) |
| 2009-25-08 | Bell Helicopter Textron Canada (BHTC) Model 407 and Model 427 Helicopters | Dec 28, 2009 | Airframe (427)Certain serial numbers: 407 53000–53408; 407 53421–53459; 427 56001–56046. Only with: Does not apply to helicopters with hydraulic pump input shaft P/N 407-340-107-101 and interconnect adapter P/N 407-340-108-101 installed in place of hydraulic pump driveshaft assembly P/N 406-040-072-105. |
| 2009-22-11 | Bell Helicopter Textron Canada Model 407 and 427 Helicopters | Nov 16, 2009 | Airframe (427)Certain serial numbers: 407 53000–53887; 407 53890–53916; 407 53918; 407 53920; 407 53921; 407 53923–53926; …. Only with: Anti-drive (swashplate) link assembly P/N 406-010-432-101 with S/N prefix of TI or TIFS installed. |
| 2009-15-15 | Bell Helicopter Textron Canada Model 427 Helicopters | Sep 8, 2009 | Airframe (427)Certain serial numbers: 427 56001–56057; 427 58001; 427 58002 |
| 2009-07-52 | Bell Helicopter Textron Canada Limited Model 206A Series, 206B Series, 206L Series, 407… | May 1, 2009 | Airframe (427)Only with: Model 206A/206B/206L series with cyclic control lever assembly P/N 206-001-401-111, 206-001-400-115, or 206-001-400-111, and Model 407/427 with lever assembly P/N 407-001-320-105 or 407-001-320-109, with less than 50 hours TIS. |
| 2009-08-03 | Bell Helicopter Textron Canada Limited Model 206A, 206B, 206L, 206L-1, 206L-3, 206L-4… | Apr 24, 2009 | Airframe (427)Serial numbers per Rotor Blades, Inc. (RBI) document attached to Bell Helicopter Textron ASBs 206-07-116, 206L-07-148, 222-07-106, 222U-07-77, 230-07-38, 407-07-81, 427-07-18, 430-07-41. Only with: Tail rotor blade installed with a part number and serial number listed in the RBI document attached to the applicable Bell ASB. |
| 2003-04-12 | Bell Helicopter Textron Canada Limited Model 427 Helicopters | Apr 4, 2003 | Airframe (427)Certain serial numbers: 427 56001–56030. Only with: Auxiliary fin assemblies P/N 427-035-836-101, -102, -105, or -106 installed. |
| 2003-04-14 | Bell Helicopter Textron Canada (Bell) Model 427 Helicopters | Apr 4, 2003 | Airframe (427)Certain serial numbers: 427 56001–56031. Only with: Hydraulic solenoid tee fitting P/N AS1003W060404 installed. |